The E-flite EFLB2001S25 200mAh 1S 3.7v 25c Li-po Battery is a high-quality rechargeable battery designed for RC model vehicles. With a voltage of 3.7v and a chemical composition of LiPo, this battery provides reliable power for extended periods of time. Manufactured by E-Flite in China, this battery is a popular choice among hobbyists and enthusiasts looking for a consistent and durable power source for their RC vehicles.