Cell types: 14500 lithium batteries [battery size]: Phi 14mm&plusmn; 0.01 * L50.5mm&plusmn; 0.02 [battery voltage]: 3.7V [battery capacity]: nominal capacity 1300mAh. Must use standard lithium battery charger 4.2V charge. 2 no large current discharge. 3 no discharge, single battery voltage should not be less than 2.75V. Four<p> <b><b><img src="https://contestimg.wish.com/api/webimage/570f35ce61d6cf5a40902c04-large.jpg"><img src="https://contestimg.wish.com/api/webimage/570f35ce61d6cf5a40902c04-1-large.jpg"><img src="https://contestimg.wish.com/api/webimage/570f35ce61d6cf5a40902c04-2-large.jpg></b></b></p>