These 14500 (AA) rechargeable lithium batteries will allow you to get incredible runtime out of the flashlights that can handle them. Roughly the same size as one AA battery, each 14500 is 3.7V and 900 mAh in a resting state. A protection circuit is attached to the battery to ensure that you do not overcharge or over discharge the battery. As with all lithium batteries, the proper care needs to be observed. Do not overheat, incinerate, reverse polarity, mix voltages, or do any other potentially dangerous activity with these or any other lithium batteries.
