Anyone know where to find an aftermarket battery for a Siemens TEK/Rexton BLU RCU remote? I’d like to keep a charged spare on hand, but I cannot find a part number on the original battery. It’s marked “Siemens Li-Ion Battery Rated 3.7V 1000mAh3.7Wh” (plus all the usual warnings, a manufacture date, and a serial number).
I’m guessing it could be the same as some common cell-phone battery.