1.High Capacity:2S 7.4V 3800mAh LiPo battery capacity, provides enduring working time. Test data from 144001,it has 25 Mins test idle Running time, brings you longer funny time. 2.Rechargeble for Multiple Times:Durable and convenient. 3.Suitable for Outdoor Playing:Safe in normal use, good choice for your RC model. 4.Designed for Wltoys:144001/144010/124017/124019/124018/12428 RC Car battery upgrades . 5.Stable Quality:Safe and reliable.