wm5 device still have backup battery, but they use it in a different way, not as in 2003/SE device where the BBatt was for keeping the NOR memory and avoiding hard reset.
the BBatt in the cingular/kjam is next to the input/output miniUSB connector, and is a V6HR Varta NiMh 1.2v.
sometime it stops working and it makes the main battery to stop charging and/or discharging properly.
EDIT: my mistake, it's not a kjam, it's a tytn/hermes. I confused 8525 with 8125. sorry..
