Features:-800mAh 3.7V Li-Ion batteries compatible with E35, DE38, DE40, DE50, DE55, TB202, TM141 (only if voltage, dimensions and plug match, then it will fit).-Fast, consistent charging is always possible, and there's no battery memory effect, so you don't need to completely discharge yourself before charging.-The safety guarantee is free of mercury/cadmium/lead, no pollution to the environment, and can prevent battery explosion caused by over-voltage.-Small size and light weight, very portable. -The unique design is recycled at least 300 times.Note:-Store in a cool and dry place.-Use under the direct supervision of an adult.Specification:Dimensions: 5*1.45cmCapacity: 800mAhVoltage: 3.7VMaterial: lithium manganate Package Included:4x Lithi.