The Best 9V Rechargeable Battery


Low-self discharge 9v NiMH batteries have become available in the last few years. The “low-self discharge” label means these batteries will hold their charge for a year, unlike previous NiMH batteries. This makes these 9V battery much more compelling, because 9V batteries are often used in applications like fire alarms, where the battery must sit for year or more.


Accupower has released a 300 mAh 9 Volt Rechargeable NiMH Battery — this currently the highest capacity rechargeable 9V.

The second highest capacity 9V is the Ansmann low-discharge 250 mAh 9v.

Centura 9V NiMH Battery by Tenergy

You can find the low-discharge, 200 mAh “Centura” Tenergy 9V rechargeable battery, on Amazon, $26 for a pack of 4, including a charger.

Imedion 9V NiMH Battery by Maha

The 250 mAh 9V Imedion by Maha is available on Amazon for $20.95 for a pack of 2 batteries. These batteries are more expensive, but they have a higher capacity of charge (250 mAH compared to Tenergy’s 200 mAh), and Maha’s batteries have a better reputation in terms of quality.

You can also get 9V rechargeables from Energizer, but their quality is poor.


9v Lithium Ion Rechargeables

Lithion ion chargeable 9V

You can also get Lithium Polymer 9v rechargeable batteries, that use a new gel-type electrolyte. This gel has an energy density that is 20% more than typical lithium ion batteries (550 mAh in capacity). They also last 2 to 3 times longer than rechargeable 9V NiMH batteries, and they hold their charge longer. They are available on Amazon, for about $13 each. You can get the charger and battery pack here.

The Maximal Power chargers are no longer available — the EBL charger looks like a good substitute.

See also our review of this year’s best rechargeable NiHM batteries and chargers.


  1. says


    But what do people use 9 volt batteries for these days?

    I don’t think I’ve bought a 9 volt battery powered device since I got my last radio-controlled car. (That would be about…oh…20 years ago. And can I just say that the Ferrari Testarossa did not handle carpet as well as I thought it would.)

    – Aaron Dalton,

    • Don says

      I’m sure many toys still require 9V batteries but as an adult there are also many applications for 9V batteries, clock radio back-up, all forms of smoke detectors, radon & Co2 detectors, stud finders, telephony toners, both toner and wand. There’s plenty of things out there, just because you don’t use them doesn’t mean someone else doesn’t.

  2. Furt says

    I’m thinking about getting these for work (community college). We have 3 wireless mics for our auditorium and almost all of our smoke alarms and other sensors use 9v batteries. Be nice to have a rechargeable that doesn’t drain down when not in use, recharges more times than NiMH, and doesn’t contain any heavy metals.

  3. Justin says

    To Power Crazy:

    Lithium polymer batteries hold their charge longer than NiMH batteries. Not sure of the exact specs….


  4. Sam says

    I own the 500mAh I-Power and they are worth their weight in gold I have had mine for over a year. I use them every day in a portable scale to do inverntory for restaurants 6 days a week and they last about three times as long as a reqular 9-volt and twice as long as a stantard NiMH.
    They are expensive at first but they will pay for them selfs. They will hold a charge for months and they charge in 35 mins to 1 hour which is quick for a rechargeable. I speculate they will last as about as long as a computer battery so probable years and they are actually a little lighter than a standerd 9-volt. If you do buy you will be sold on these guys…
    P.S. Leave the charge at home I have forgot mine at an account and it was gone the next day.

  5. alan says

    How do these compare to the 9.6Volt NiMh batteries as far as nominal voltage under load?

    I use mine for in ear monitors and lower voltage batteries causes it to think the voltage is too low and the sound drops out and the low voltage light starts blinking.

    I know Lithium hold their voltage very well, but I don’t know if its enough to compare to the higher 9.6V.

    Nominal Volts of 8.4 of the Lithium is a whole volt lower than the 9.6 Volt of the NiMh.. but I don’t know if “nominal voltage” is that different.

    Can you help me in my quest?

  6. says

    I’m curious about their effectiveness in smoke/carbon monoxide detectors. Those give warnings to change batteries when the battery drops to 7-7.5 volts, which gives them a 30 day lifespan from that point where they’ll beep constantly. For alkaline batteries this is measured almost exactly, but with rechargeables having a longer plateau of voltage before a steeper drop, would these batteries be able to provide the manufacturer’s “minimum safety requirement” for batteries of that 30 day warning time from when it hits 7 volts?

    If you’re interested, check out my new website at


  7. vaper says

    can you run these through a adjustable regulator to work at 3.7-5v? Just curious, I’m a noobie and want 3.7 through 5v but not run 2 rechargable batteries in a series.

  8. says

    A lot of these batteries are quite useful for an integrated source for a headphone amp. I have a standard 170 from duracell, and I’m constantly running out withing 40-50 hours with 2 of them. Great little accessories if you are traveling and don’t want to lug around your headphone amp.

  9. Brady says

    I use tons of 9v batteries for guitars and belt packs (I am a professional musician). The guitars especially are very low draw devices with time where they sit in storage. Being new to the rechargable game, does anyone have recommendations on what batteries to get? I would rather have quality, durability, and charge capacity over price point.

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