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. Descriptions: 7.4v LiPo battery has long lasting and with high performance,designed for Wltoys 144001/144010/124017/124019/124018/12428 RC Car Battery Upgrades.Built to strict quality control standards, high strength and long life service. You can't use it immediately when installing it. You need to modify your car. Product Name: RC Car Battery Battery Cap.