MetaEfficient http://www.metaefficient.com The Guide To Efficient Living Mon, 01 Jun 2015 21:59:02 +0000 en-US hourly 1 http://wordpress.org/?v=4.2.4 Do Rechargeable Lithium-Ion AA Batteries Exist? http://www.metaefficient.com/rechargeable-batteries/rechargeable-litihiumion-aa-batteries-exist.html http://www.metaefficient.com/rechargeable-batteries/rechargeable-litihiumion-aa-batteries-exist.html#comments Fri, 27 Mar 2015 00:46:00 +0000 http://www.metaefficient.com/?p=10505 Do rechargeable lithium-ion batteries exist in standard sizes like AA, AAA, C or D? Yes, they are finally available. A company called Kentli has released AA and AAA rechargeable lithium polymer batteries that output 1.5 volts. Kentli batteries are available on Amazon here. Lithium-ion batteries normally operate 3.7V per cell — but Kentli put circuitry inside the […]

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4pcs-KENTLI-1-5v-AA-PH5-2800mWh-Rechargeable-Li-ion-Li-polymer-Lithium-battery-4-slots

Do rechargeable lithium-ion batteries exist in standard sizes like AA, AAA, C or D?

Yes, they are finally available. A company called Kentli has released AA and AAA rechargeable lithium polymer batteries that output 1.5 volts.

Kentli batteries are available on Amazon here.

New-KENTLI-2pcs-1-5v-2800mAh-Lithium-ion-Polymer-Rechargeable-Battery-Charger-AA-Batteries-Pack-4

Lithium-ion batteries normally operate 3.7V per cell — but Kentli put circuitry inside the cells to reduce the voltage to 1.5 volts. The company claims that the batteries have a capacity of 2800aH which matches Eneloop Pro (the NiMH batteries with the highest capacity).

Additionally, Kentli batteries are lighter than Eneloop Pro. However, they are more expensive. A four pack of Eneloop Pros costs about $17, whereas a 4 pack of Kentli cells costs about $40.

Sanyo XX "Powered By Eneloop"

Other Lithium-Ion Rechargeables

Tesla-Battery-Cell-18650

There are also some lithium-ion rechargeable batteries made for high-performance flashlights and cameras, in these sizes: 18650 and CR123.

A single 18650 battery can replace two CR123A batteries, although at a lower voltage (but much higher amperage). However, the 18650 is a wider cell and will not fit into a flashlight that is designed strictly for the narrower CR123As. Most modern tactical LED lights are designed to use a single 18650 or two CR123As, but it’s best to check before buying. See our article on The Best 18650 Batteries for more information.

There are also numerous other types of lithium-ion batteries made for specific laptops and other electronics gadgets. There is currently no standard size for these lithium-ion cells.

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The Best LED Desk Lamps Of 2015 http://www.metaefficient.com/leds/led-desk-lamps.html http://www.metaefficient.com/leds/led-desk-lamps.html#comments Tue, 17 Mar 2015 17:41:10 +0000 http://www.metaefficient.com/?p=2988 Best Overall: TaoTronics Elune Desk Lamp The TaoTronics Elune is priced at $50 and it is probably the best value LED desk lamp available. This lamp has 30 LEDs that shine with 450 lumens at full power. The lamp has a slide touch switch on the top that allows you to adjust the brightness to any […]

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Best Overall: TaoTronics Elune Desk Lamp

The TaoTronics Elune is priced at $50 and it is probably the best value LED desk lamp available. This lamp has 30 LEDs that shine with 450 lumens at full power. The lamp has a slide touch switch on the top that allows you to adjust the brightness to any one of 7 brightness levels. It has a memory function that records the light level you last used.

When the light is dimmed the light does not flicker and it has a good frequency of light that is a white light that is ideal for reading. It ranges from 5500 to 6000 K. This makes a nice desk lamp or reading lamp.

Link: TaoTronics Elune

Update June 2015: You may also want to consider the Lumiy Lightblade 1500S

The Softech DL-90 Multi-Function LED Desk Lamp

LED Desk Lamp By Softech

This lamp was just released this year by Softech, and it has a lot going for it. The lamp incorporates 27 high-power daylight LEDs. The Color Rendering Index of the LEDs is rated at 90+ (excellent).

The lamp has four distinct lighting modes and 40 brightness levels in total. The first two modes are for desk work: a reading mode with mid-range colors (4300K-5300K) that are easy on the eyes, and a study mode which has a high range color temperature (6000K-7000K). The lamp can also be switched to a relaxation mode and a sleep mode — these have softer, warm color temperatures.

This lamp uses 10 watts or less of power to provide light equivalent to a 100 watt incandescent bulb. It is said to last about 40,000 hours or 20 years of normal use.

A handy feature of this lamp is the “auto off timer”. The timer will turn the lamp off after one hour, saving your power if you forget to turn it off. It has a USB charging port.

The Softech DL-90 lamp is available from Amazon for about $90.

Award Winning – The Z-Bar High Power LED Desk Lamp

Z-Bar High Powered LED Desk Lamp

The minimalist Z-Bar High Power LED Desk Lamp is an attractive lamp that features the latest LEDs.

It has six daylight white LEDs that use only about 9 watts of electricity at full brightness (the LEDs generate about 240 lumens of light).

Z-Bar LED Desk Lamp In Rotation

The Z-Bar has a built-in 4-step dimming function that will take the light down to save even more on electricity or it can be used to create softer lighting for the task at hand. The adjustable joints can be placed in almost any position without tightening or loosening knobs or screws, simply move the light to where you need it and the lamp will hold to form.

The Z-Bar received an I.D. Magazine “best of category” award a few years ago.

The Z-Bar LED Desk Lamp is available from Amazon for around $279.

A Magnifying Lamp: TheFulcrum Magnifier 12 LED Floor Lamp

The Fulcrum Magnifier is an illuminated magnifying lamp has a 5-inch diameter lens has 2x magnification power with a 6x inset for fine details. This lamp gets an average rating of 4.2 of 5 from 44+ reviewers on Amazon.

It has 12 glare-free LEDs and a flexible gooseneck that allows you to position the lamp exactly where you need it. It comes with an AC adaptor, but may also be operated wire-free with three alkaline D batteries (see our article on The Best D-Size Rechargeable Batteries).

The Fulcrum Magnifier is available at Amazon for about $75.

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The Best Rechargeable Batteries and Chargers Of 2015 http://www.metaefficient.com/rechargeable-batteries/best-rechargeable-batteries-battery-chargers.html http://www.metaefficient.com/rechargeable-batteries/best-rechargeable-batteries-battery-chargers.html#comments Fri, 20 Feb 2015 16:56:13 +0000 http://s31669.gridserver.com/?p=781 In A Nutshell Here are my recommendations for the best rechargeable AA batteries: If you want the best energy capacity (2550 mAh) — get the Eneloop Pro If you want maximum recharge capacity (2100 times) — get the 4th Generation Panasonic Eneloops If you want to save some money and don’t mind a little less […]

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best-rechargeable-batteries

In A Nutshell

Here are my recommendations for the best rechargeable AA batteries:

Overall, the best rechargeable AA battery is the Eneloop Pro. They have a high energy capacity (2500 mAh), and they perform better than similar high-capacity AAs. They can only be charged 500 times (versus 2100 times for regular Eneloops). But most people will never charge their batteries that many times. For example, if you charged your batteries twice a week consistently, it would take 5 years to reach 500 charges.

Also worthy of consideration is the Maha’s Imedion battery, which is cheaper than the Eneloop Pro (about $5 less for a pack of 4). Imedions are also low-discharge, high-capacity batteries (2400 mAh), but they do not perform quite as well as the Eneloop Pro (see this review for the details on their performance).

The Details

Today, the best rechargeable batteries are the “low self-discharge” Nickel-Metal Hydride (Ni-MH) cells.

These batteries have a lot going for them: they come fully charged (like alkaline batteries), and they can hold their charge over many months (unlike regular Ni-MH rechargeables). Because they can hold their charge for so long, they are suitable for low-drain devices like remote controls and flashlights. However, they are ideal for use in high-drain electronic devices like digital cameras, where they out-perform alkalines. See this graph for a comparison:

eneloop-comparison

Generally, the best low self-discharge batteries are made in Japan (the others are made in China), these are: Panasonic’s Eneloops, Duracell, Energizer and Sony. The Eneloop Pro batteries from Panasonic definitely hold their charge the longest, and they are my top recommendation. I do not recommend the Energizer or Duracell rechargeable batteries — these name brands seem to produce inferior rechargeables, perhaps to protect their sales of alkaline batteries.

See also my review of  best rechargeable D Size Batteries, C Size and 9V batteries.

Eneloop Rechargeable Batteries by Panasonic

Better designed than other rechargeables, Eneloop batteries have become a best-selling battery. Eneloops can be recharged up to 2100 times, and they will retain their charged capacity even after years of storage. After 6 months, they retain 90% of their charge. After five years, they retain 70% of their charge (when stored at 20 degree Celsius). Panasonic recommends keeping the batteries in a cool location to maximize charge retention.

The AA-sized Eneloops are rated at 2000 mAh, and the AAA-sized Eneloops are rated at 800 mAh (mAh stands for “MiliAmp hours” — a unit that indicates how much energy a battery can hold.)

The charge times are as follows: AA Eneloops charge in 230 minutes, and AAA Eneloops charge in 135 minutes.

Eneloop batteries are available at Amazon in 8 packs, and 16 packs and 32 packs. They are also available with a charger: 8 Eneloop Batteries with a Charger. Note that these links to the second-generation 2000 mAh eneloops.

Eneloop Pros

 

Sanyo XX "Powered By Eneloop"

The Eneloop Pro is a high-capacity version of the regular Eneloop cell. The Eneloop Pro has a capacity of 2500 mAh –this is 500 mAh more than the regular Eneloops. Their only potential downside is that they can be charged 500 times — not 2100 times like the regular Eneloops. However, on average most people will charge their batteries about 100-200 times over a 5 year period.

Eneloop Pro batteries are available on Amazon.

The Best Battery Chargers

How about some good battery chargers to go with these batteries? The chargers featured below are some of the smartest out there — they have built-in protection to prevent overcharging or undercharging. They can also handle most battery sizes.

PowerEx MH-C9000 WizardOne Charger-Analyzer

The PowerEx MH-C9000 is one of the most sophisticated NiMH AA battery analyzer/chargers available. It has excellent ratings on Amazon — an average of 4.6 out of 5 starts from about 300 reviewers.

The drawback is that the single-status LCD panel a long programming sequence makes it a bit difficult to use for multiple cells. If this is an issue for you, consider the Maha charger listed below.

The PowerEx MH-C9000 is available at Amazon for about $55.

Maha PowerEx “Ultimate Professional” Charger

Maha PowerEx Battery Charger

The Maha’s Ultimate Professional Charger lives up to its hyperbolic name. This compact charger can charge any combination of 1 to 8 batteries. You can mix and charge AA, AAA, C and D sized cells at the same time on individual charging circuits. Each battery size also has its own fixed contact charging points (i.e. not a spring). An LCD display shows charging and conditioning status of each rechargeable battery.

Maha’s chargers can restore batteries to their optimal performance level by repeatedly charging and discharging them. It also has intelligent charging technology and overcharge protection. It also comes with an international AC adaptor, and short-circuit protection.

It’s available from Amazon for around $96.

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The Best C-Size Rechargeable Batteries Of 2015 http://www.metaefficient.com/rechargeable-batteries/csize-rechargeable-batteries-2012.html http://www.metaefficient.com/rechargeable-batteries/csize-rechargeable-batteries-2012.html#respond Thu, 15 Jan 2015 19:25:10 +0000 http://www.metaefficient.com/?p=10597 The best rechargeable C-size batteries are Acculoop C cells, by Accupower. These batteries are the new low self-discharge NiMH (Nickel Metal-Hydride) cells, and they have a high capacity of 4500 mAhs (milliamp hours).

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In A Nutshell

The best rechargeable C-size batteries are Acculoop C cells, by Accupower. These batteries are the new low self-discharge NiMH (Nickel Metal-Hydride) cells, and they have a high capacity of 4500 mAhs (milliamp hours). Acculoop batteries are also rebranded as “AccuEvolution” — these are the same batteries marketed by a Michigan company in the USA with a partnership with Accupower in Austria.

The Details

Rechargeable batteries have made some real improvements in the last five years. Most notably, you can now get rechargeables that don’t go flat after a couple of months! The technology is called “low self-discharge” and means rechargeable batteries can hold 80% of their charge for a year. Low self-discharge batteries (LSD) NiMH cells were first introduced by Sanyo in their Eneloop AA cells in November 2005. Since then, other battery manufacturers have adopted this technology. Then in 2010, companies like Accupower and Maha started releasing LSD NiMH cells in C and D sizes.

An alkaline C cell is typically rated for about 8000 mAh, but only at a very low current (around 30 mA). When used at a load of 500 mA (such as flashlight), the capacity of an alkaline drops to about half. Basically, the advantage that alkaline  cells have over NiHM cells, is that they have a shelf life of about 10 years, with minimal self-discharge.

We recommend he Acculoop C cells, which are available from Amazon. A set of two Acculoop C cells costs around $15.

It is possible to get a higher capacity LSD C cells — the 5000 mAh Imedion C cells by Maha. However, they cost about $25 for a pack of 2, which is about $5 for a 500 mAh increase in capacity.

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Efficient Men’s Shirt For Summer: Renewable Wool, Non-Wrinkling, Made In USA http://www.metaefficient.com/clothing/efficient-mens-shirts-summer-renewable-wool-nonwrinkling-usa.html http://www.metaefficient.com/clothing/efficient-mens-shirts-summer-renewable-wool-nonwrinkling-usa.html#respond Thu, 03 Jul 2014 21:01:06 +0000 http://www.metaefficient.com/?p=12991 Ibex makes shirts from renewable merino wool (from New Zealand). Ibex clothing is sewn in the USA (only tiny faction of the shirts sold in the US are actually constructed here). I like merino wool because it keeps you cool in the summer, and unlike cotton or synthetics, merino does not retain odor, and it […]

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ibex-merino-wool-shirt

Ibex makes shirts from renewable merino wool (from New Zealand). Ibex clothing is sewn in the USA (only tiny faction of the shirts sold in the US are actually constructed here).

I like merino wool because it keeps you cool in the summer, and unlike cotton or synthetics, merino does not retain odor, and it does not wrinkle.

The polo shirt shown here is available from Amazon.

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Two Books That Examine The Causes Of Cancer, And Offer Practical Advice http://www.metaefficient.com/book-reviews/books-examine-cancer-offer-practical-advice.html http://www.metaefficient.com/book-reviews/books-examine-cancer-offer-practical-advice.html#respond Sat, 31 May 2014 18:22:38 +0000 http://www.metaefficient.com/?p=12953 There are many books on cancer, but there are surprisingly few books that examine the causes of cancer.

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One in every two American men and one out of every three American women will get cancer over the course of their lifetime. Yet, there are surprisingly few books that examine the causes of cancer. After reading these book, it seems to me we’ve been underestimating the extent to which you can avoid cancer through careful lifestyle choices.

avoidingcancer

Avoiding Cancer One Day At A Time

Avoiding Cancer One Day At A Time by Lynn Eldridge and David Morgeson is one of the few books that offer practical advice on how to avoid most cancers.

Here’s some figures on cancer deaths that they present at the beginning of the book:

  • 5% to 20% of all cancer deaths are due to an inherited mutation
  • 80% to 95% of all cancer deaths are caused by non-genetic factors

Breaking the non-genetic factors down further they say:

  • 25% to 40% of all cancer deaths are caused by tobacco smoking
  • 25 % to 30% of all cancer deaths are caused by diet and obesity
  • 2% to 7% of all cancer deaths are caused by radon exposure and exposure to ultraviolet radiation (e.g. sunburn or cumulative sun exposure)
  • 2% to 8% of all cancer deaths are caused by exposure to toxins in the workplace
  • less than 1% to 5% of cancer deaths are caused by pollution and toxins in the environment

They also state that physical inactivity contributes to 1% to 2% of cancer deaths, and alcohol consumption is involved in 3% of cancer deaths.

They then discuss at length all the things you can do in your daily life to avoid cancer. Much of it involves avoiding toxic substances like air fresheners, but they also mention things like getting enough sleep, and many occupational hazards.

Link: Avoiding Cancer One Day At A Time by Lynn Eldridge M.D. and David Morgeson MS, MPT

Toxin And Toxout: Getting Harmful Chemicals Out Of Bodies And Our World

Toxin Toxout cover

After authors Rick Smith and Bruce Lourie wrote about all of the ways that toxins get in our bodies, in their first book, Slow Death by Rubber Duck. Their new book, Toxin and Toxout, serves a guide for eliminating those toxins. The authors undergo various treatments, and have blood and urine tests to measure the how much toxins were being being eliminated.

They evaluate various detox strategies, and caution against quick-fix, fad-based diets and cleanses. Instead they recommend sweating as the best detox method — sweating in saunas or during exercise for example. Apparently, chelation also works quite well for eliminating heavy metals.

They also offer their top ten ways to avoid toxins:

  1. Use natural personal care products that don’t contain chemicals like phthalates or parabens
  2. Eat more organic food to avoid pesticides
  3. Drink the water from your tap! And lots of it!
  4. Use natural fibers and green products like low-VOC paints in your home, and avoid products that might off-gas
  5. Eat more vegetables and less meat, to avoid toxin-grabbing animal fat
  6. Sweat more—toxic chemicals like BPA and phthalates leave your body through your sweat
  7. Exercise
  8. Avoid wacky quick-fix detoxes and optimize your body’s natural detox mechanisms by adopting a detox lifestyle
  9. Buy less, buy green
  10. Support politicians who believe in a greener economy and organizations that are working for a cleaner environment

Link: Toxin and Toxout

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Glycerin: An Underrated Natural Moisturizer http://www.metaefficient.com/bathroom-products/glycerin-underrated-natural-moisturizer.html http://www.metaefficient.com/bathroom-products/glycerin-underrated-natural-moisturizer.html#respond Fri, 09 May 2014 02:50:57 +0000 http://www.metaefficient.com/?p=12933 Glycerin is perhaps the best natural humectant (moisturizing substance). It absorbs an amazing 50 percent of its weight in moisture from the air. This makes it an excellent aftershave — just a rub a little on your skin for the moisturizing effect. Glycerin is created when a vegetable oil like olive oil is mixed with […]

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glycerin-moisturizer

Glycerin is perhaps the best natural humectant (moisturizing substance). It absorbs an amazing 50 percent of its weight in moisture from the air. This makes it an excellent aftershave — just a rub a little on your skin for the moisturizing effect.

Glycerin is created when a vegetable oil like olive oil is mixed with an alakli. The result is a thick, sweet, fatty liquid.

Glycerin is available from health stores and Amazon.

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The Best Places To Trade-In Your Electronics, DVDs & Books http://www.metaefficient.com/books-web-sites-info/efficient-technique-cash-electronics-books-cd-dvds.html http://www.metaefficient.com/books-web-sites-info/efficient-technique-cash-electronics-books-cd-dvds.html#respond Tue, 06 May 2014 20:07:24 +0000 http://www.metaefficient.com/?p=10115 Recently, I tested trading-in some of my old books, electronics, DVDs and CDs that were gathering dust on my shelves. I was able to free up some shelf space, and in addition I received some cash and credit (about $600 total). All of these trades went smoothly, the most laborious part was packaging all the […]

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electronics

Recently, I tested trading-in some of my old books, electronics, DVDs and CDs that were gathering dust on my shelves. I was able to free up some shelf space, and in addition I received some cash and credit (about $600 total). All of these trades went smoothly, the most laborious part was packaging all the items in a box, and shipping them out. Here are the trade-in services I used:

BuyBackWorld: Electronics

buybackworld

BuyBackWorld is my recommended site for trading-in electronics. They accept many types of devices and accessories, and they offer good rates. For example, a first-generation iPad with 32GB in average condition will get you $56.

Payment is via personal check or Paypal.

You can opt to have a pre-paid mailing kit sent to you for free, or you can print a pre-paid USPS label, and do the mailing yourself.

Link: BuyBackWorld

Amazon Trade-In Program

With the Amazon Trade-In Store, you can trade in books, DVDs, electronics and video games for an Amazon gift card (i.e. store credit). I received a total of $378.16 in credit for trading in a total of 90 items (75 books, 13 DVDs and 2 videos games). My books ranged in value from $0.25 up to $21 for a book about residential lighting. I received average of $3 per item for my old DVDs and video games.

Amazon pays the costs of shipping your traded items, and also covers the costs of shipping back items that were not accepted. In my case, only one of my books was rejected (due to a damaged cover), and it was sent back to me.

Overall, the Amazon Trade-In Store was quite convenient, but they didn’t accept some of my older books and electronics….

 

Abundatrade: Books, CD, DVDs and Video Games

I found Abundatrade — this store accepted my CDs for a cash trade, and they also accepted many of the books that Amazon rejected. There are similar services out there (like Spun and SecondSpin) but they didn’t accept as many of my CDs and their valuations were not as good.

At Abundatrade, I traded in 64 CDs for total of $66.91. They didn’t reject any of my CDs, but their trade-in process isn’t as streamlined as Amazon’s, and I had to pay for shipping, which was about $8, so the grand total was $58.91 (or about $1 per CD). I opted to be paid via Paypal, if I had opted for Abundatrade store credit, I would have received a 25% bonus.

Update: Abundatrade just accepted 49 books which were not recognized or valued by the Amazon system for $88.

BookJingle: Books

I just tried trading in some books at Book Jingle. This is another reliable site for trading in books. For ten books I received $72.

 

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Bone Char: A Very Effective Filter http://www.metaefficient.com/water-filters/bonechar-underrated-amazingly-effective-filter.html http://www.metaefficient.com/water-filters/bonechar-underrated-amazingly-effective-filter.html#respond Tue, 06 May 2014 18:10:45 +0000 http://www.metaefficient.com/?p=12671 Bone char -- the name is perhaps...uninspiring, but it's one the most underrated water filtering substance I've encountered.

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bone-char

Bone Char — the name is perhaps…uninspiring, but it’s one the most underrated water filtering substance I’ve encountered.

It excels at removing fluoride from water — it can remove 90% of fluoride in some cases. It can also remove some heavy metals, radioactives, chlorine and other contaminants from water. See a full list here.

Bone char, which also goes by the name Brimac, is created by taking bovine (cow) bones, thoroughly cleaning them, and drying them in the sun for at least 90 days. (Note: This isn’t a vegan product, but it is usually Kosher certified.)

The bones are then heated 1472° F in the absence of oxygen.

The result is a char made of 80% phosphate of calcium, 10% carbon and 10% calcium carbonate. It has a very porous ionic surface, that loves adsorbing things.

Bone char is different from activated carbon in that it contains both a carbon surface area and mineral hydroxyapatite lattice surface area — see graphic below.

HA

A couple of tips for using Brimac:

  • Brimac works best at a slightly acidic pH and may not work as well with hard water
  • If your only aim is to remove fluoride, the efficiency of the fluoride adsorption adding pre-filters to remove heavy metals and other contaminants before exposure to the bone char

You can purchase Bone Char in bulk from BuyActivatedCarbon.Com. I went ahead a bought a 6 pounds ($53) of it for test purposes. Unfortunately there doesn’t seem to be way to buy smaller quantities.

water-filter

To filter water, I put the Brimac in a small satchel and let it sit in water overnight in a water dispenser (picture above). I also have some Japanese binchotan charcoal in there too (see my article on binchotan).

You can also find manufactured Brimac filters on Amazon.

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The Best LED Flashlights Of 2014 http://www.metaefficient.com/flashlights/best-flashlights-reviews-top-rated.html http://www.metaefficient.com/flashlights/best-flashlights-reviews-top-rated.html#comments Tue, 08 Apr 2014 19:06:37 +0000 http://www.metaefficient.com/?p=2616 In A Nutshell Here are the best LED flashlights of 2014: The brightest keyring-size LED flashlight: Fenix LD01 — 80 lumens — costs around $40 The best standard-size LED flashlight: Fenix TK11 R5 — 225 lumens – costs around $75 The brightest LED flashlight that runs on AA batteries: Fenix TK-41 U2  860 lumens – […]

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The Best LED Flashlights Of 2014

In A Nutshell

Here are the best LED flashlights of 2014:

  • The brightest keyring-size LED flashlight: Fenix LD01 — 80 lumens — costs around $40
  • The best standard-size LED flashlight: Fenix TK11 R5 — 225 lumens – costs around $75
  • The brightest LED flashlight that runs on AA batteries: Fenix TK-41 U2  860 lumens – costs around $110
  • The brightest LED flashlight: Nitecore TM15 Tiny Monster — 2450 lumens — costs about $220

A few notable brands of flashlight are still made in the U.S. — Streamlight (made in Eagleville, Pennsylvania) and Surefire (made in Fountain Valley, California), and Pelican (made in Torrance, California).

See also my guide to the best rechargeable batteries.

Brightest LED Flashlight Running On AA Batteries

brightest-led

The Fenix TK-41 U2, which shines at 860 lumens, is the brightest LED flashlight that runs on AA batteries. It uses eight AA batteries, and these can be rechargeable NiMH or alkaline AAs. The TK41 produces four brightness levels, the lowest (10 lumens) allows the flashlight to run for up to 240 hours.

The Fenix TK-41 U2, is available from Amazon for about $111.

Best Overall Flashlight – Fenix TK11 R5 LED Flashlight

Fenix TK11 LED Flashlight

Pros: Very bright, durable, quality components, waterproof, inexpensive.
Price:
$73

The Fenix TK11 R5 impressed reviewers with its build quality and light quality. The TK11 R5 uses of two Cree 7090 XR-E Premium Q5 LEDs (PDF), producing very bright beam of light (285 lumens in turbo mode). Most reviewers say that Fenix now rivals Surefire in terms of build quality, but because Fenix lights use Cree LEDs, their flashlights are brighter and more affordable than Surefire lights.

The Fenix Tk11 is part of the Tactical range of flashlights from Fenix Light. The Fenix TK11 is actually an enhanced version of Fenix T1 Tactical. The TK11 uses two CR123 or 18650 batteries. A 18650 is a rechargeable lithium-ion battery with a 3.7V working voltage. You can find rechargeable 18650 batteries and the chargers at Amazon. You can use rechargeable CR123A batteries in this flashlight. You switch between light levels by turning the flashlight’s head: turbo mode is 225 lumens, and general mode is 60 lumens.

The body of the TK11 is built of aircraft-grade aluminum alloy, and it has a very solid construction. The flashlight is coated inside out with olive color type III hard coat anodizing that not only provides excellent surface look and feel finish but also protects body against bruises scratches.

25 Amazon reviewers gave the Fenix Tk11 an average of 4.9 stars (out of 5 stars).

It’s available from Amazon for $73.

Best Keychain-sized Flashlight – Fenix LD01 LED Flashlight

Fenix LD01 LED Flashlight

Pros: Very bright, uses single AAA battery, rugged, waterproof, affordable.
Price:
$41

Reviewers are virtually unanimous in recommending the Fenix LD01 as the best keychain-sized flashlight. The Fenix LD01 flashlight runs on a single AAA-sized battery, yet it can produce 80 lumens of light on its highest setting. It uses a Cree Q5 LED as its light source, and the lens is made of toughened, anti-reflective glass (as with all Fenix lights). It has three output modes: 10 lumens, 27 lumens, and 80 lumens.

The Fenix LD01 is also “IPX-8 water proof” which means it is suitable for continuous submersion.

Fenix LD01 Flashlight

The  Fenix LD01 is available from Amazon for $41.

Best for General Household Use – Streamlight 4AA LED Flashlight

Streamlight Propolymer 4AA LED Flashlight

Pros: Inexpensive, extremely rugged, good beam shape.

Reviews say the Streamlight ProPolymer 4AA Flashlight is the best flashlight for general household use. There are lighter and brighter flashlights out there, they can’t beat the Streamlight’s price at $28. The flashlight uses 7 LEDs that produce a flood beam with a hotspot in the middle. Reviewers at Amazon give this flashlight 4 or 5 stars, and rave about its ability to fill a room with light.

Home Page: Streamlight 4AA Product Page

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