RG5G rechargeable battery is mainly constituted a built‐in Lithium ion battery cell, and it fulfills the charging and discharging control management and protection system by the cell. The rechargeable battery’s electrode, appearance dimension and discharge voltage corresponds to the IEC 60086-2 technical manual, and it can replace the alkaline battery, Ni‐MH rechargeable battery, Nickel‐cadmium rechargeable battery and Nickel‐zine rechargeable battery with the same specification. The battery is a patented product, and it obtain the patents as follow: ZL201110219892.0, ZL201320588986.X, ZL201320588983.6, ZL201310436748.1 and ZL201310436714.2.