The battery pack is designated as HHR-200AB20F4, a Nickel Metal Hydride (NiMH) type with specifications including a voltage of 4.8V and a current rating of 4/5A. It is described as a BATTERY PACK NIMH 4.8V 4/5 A - 4/5A 4.8 V Nickel Metal Hydride Battery Pack from Adibuja.