AW batteries are well known for being the best.
You simply can't get a better battery than the AW.
AW's IMR High Drain rechargeable battery chemistry is safer than Li-Ion, offers faster discharge rates, and is better suited for high power applications like in the ProVari
• 1100 mAh
• Nominal Working Voltage: 3.7V
• Peak Voltage: 4.2V
• Dimensions: 18D x 49H mm (+/- 0.5mm)
• Weight: 30 (+/- 2) g
Check out these great Battery Cases for safe transportation of Li-ion cells.
These IMR cells have much lower internal resistance than regular LiIon 3.7V cells and they may end up with a higher ending voltage when charged in certain chargers ( especially older version WF-139 charger ). Please check the voltage of the battery right out of the charger to see if they are above 4.20V when fully charged with your charger. Overcharging above 4.25V may shorten life/cycles. Above 4.50V may even damage them. DO NOT use the charger if it is overcharging IMR cells.