Li-polymer Battery 952540 750mAh 35C 3.7V with JST-XH-2P connector - 22AWG cables 30mm with PCMLithium ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 750mAh for a total of about 2.8 Wh. The batteries come pre-attached with a 2-pin JST-XH-2P connector as shown and include the necessary protection circuitry. The included protection circuitry keeps the battery voltage from going too high (over-charging) or low (over-use) which means that the battery will cut-out when completely dead at 3.0V. It will also protect against output shorts. However, even with this protection it is very important that you only use a LiIon/LiPoly constant-voltage/constant-current charger to recharge them and at a rate of 375mA or less.Like most lipos, the batteries we sell do not have thermistors built in. This is why we suggest charging at 1/2C or even less - 375mA max in this case. Additional safety notes: Do not use a NiMH/NiCad/lead-acid charger! Also, do not abuse these batteries, do not short, bend, crush or puncture. As with all Lithium ion polymer batteries and with any power source - they should be used by experts who are comfortable working with power supplies. Output: 750mAh at 3.7V nominal Connector: 2-pin JST-XH-2P Cable: length 30mm, AWG 22 Dimensions: 9.5x25x40mm