LED Lanterns are perhaps the most useful portable lights — they can be used as camp lights, work lights, or emergency lights. The LEDs inside aren’t susceptible to shocks, and they burn for decades.
Low-self discharge 9v NiMH batteries have recently become available from Tenergy and Maha. Low-self discharge means these batteries will hold their charge for a year, unlike previous NiMH batteries. Update November 2012: Accupower has released a 300 mAh 9 Volt Rechargeable NiMH Battery — this currently the highest capacity rechargeable 9V. Ansmann has released a low-discharge 250 […]
Do rechargeable lithium-ion batteries exist in standard sizes like AA, AAA, C or D? They do, but they don’t operate at 1.2-1.5 Volts. According to Isidor Buchmann, author of Batteries in a Portable World: A Handbook on Rechargeable Batteries for Non-Engineers, this is due to safety concerns — people might try to charge them in chargers made […]