Crestron TPMC-8X Series 7.4V Li-ion Replacement Battery (TPMC-8X-BTPE) This is a 7.4V, 3600mAh Li-ion replacement battery for the Crestron TPMC-8X touchscreen control panel. It fits the TPMC-8X, TPMC-8X WiFi, and TPMC-8X-GA WiFi Touch Panel. The TPMC-8X-BT