Upgraded stick type airsoft battery has a capacity of 2000mAh, the size remains the same as 18650 battery, compared with the 1600mAh battery on the market, providing more power and won't take up more air gun space. On average, the battery can store twice as much energy as other NIMH airsoft batteries, allowing you to stay in the game longer Two connection choices - The cable type of 7.4v mini airsoft battery is SM2-plug, in addition you will also get a SM2-plug to Tamiya cable, which provides you with more options for easy use in SRB1200,SRB400, SRB400-SUB and other model pistol rifles Rarely expandable - Lithium Ion nunchuck battery is different from Lipo battery, which is greatly affected by the environment and easy to expand and aging over time. Lithium battery has a more stable chemic.