Perfect Compatibility: Superior RC drone battery accessories, compatible with E88 E88MAX E525 E99 K3 RC UAV. Rugged Case, Portable Design: The UAV lithium battery comes with a plastic case that guards the battery. The compact and lightweight design makes it easy to carry. Ideal Replacement: 3.7V RC drone battery power the drone. It is completely consistent with the shape of the primary battery, and there is no loosening problem. Superior Performance: RC drone battery is made of premium material, excellent sealing, anti oxidation, heat insulation, and long service life. Multiple Safety Protection: The 3.7V RC drone battery has overcharge protection and short circuit protection to ensure the safety of the charging process.