6.6V 850mAh 25C LiFe Battery
2S 6.6V 850mAh 20C Life Battery  JST Plug Connector for RC Helicopter Aircraft Car Model Receiver 
Specifications:
Name: 2S 6.6V 850mAh 20C Life Battery
Size: 55*30*17  mm
Weight: 48g
Plug Futaba+Balance
Packing list:
1pcs*2S 6.6V 850mAh 20C Life Battery
Lithium iron phosphate battery:
[Safety precautions for lithium battery and charger]
1. After receiving the goods, please fully charge the battery before using it. Please do not overcharge it. The single cell will be fully charged at 3.65V. It is better to choose a charger with overcharge prevention. It is recommended that someone be present when charging.
2. During battery discharge, the battery shall be subject to 2.75V of a single cell. When the voltage is close to 2.75V, please stop using the battery immediately and use it after fully charging. Low voltage alarm device is preferred. For example, BB sounds the alarm.
3. If the battery is not used for more than 48 hours, please put the battery voltage at about 3.3V or charge it to about 3.3V for storage. If it is not used for a long time, the battery shall be tested every month and discharged once.