ARRIS SURFboard SVG2482AC/Touchstone TG2472 Modems 8 Hour Battery and ARRIS Touchstone TG8/TM5/TM6/TM7/TM8 Modems 10/12 Hour Battery - SKU 790512 $59.95 ARRIS battery pack for SURFboard SVG2482AC; Touchstone TG852G, TG862G, TG1662, TG1672, TM502G, TM502H, TM504G, TM504H, WTM552G, TM602G, TM602H, TM604G, TM608G, TM722G, TM802G; and WTM652G telephony modems. Lithium-ion Battery... Out of stock