west1catv Store Rechargeable lithium-ion battery packs provide a backup power source for the ARRIS Touchstone TM4 eMTA. The Touchstone TM402P is capable of holding one or two battery packs. The Touchstone TM402G uses a single battery pack. Battery hold times are typical and can be influenced by the age of the battery, the charging state, storage conditions and operating temperature.New battery. Original factory seal. Please email with any questions.