Auto battery select was NOT a good choise...

[eovnu87435ds]

Hey all,I recently found an unused li-ion battery from a nintendo DS phat(the old one).
The specs on the battery were 3.7v, 850mAh... not much, but o well. so I solder a deans connector to it, and plug it into my Mystery brand charger(same firmware and specs as iMax b5, with discharging features as well.) I set all the settings, I change lithium type to LiIo(3.6v) and try charging it. I get this message.
"Battery Check...
Over Voltage"

i fooled around to try and get it to charge, including putting it back to lipo(since its 3.7v) and still, the same error. This was really starting to bother me. I eventually put it back to LiIo mode, and for cell count I set it to AUTO, since nothing else worked. BAD MOVE! the "smart" charger thought it was 6 cell battery, and started pumping tons of electricity into it and instantly it lit up in flames, in my bedroom ontop of that!

So my questions are, 1. why wont this charge? and 2. I have a second DS phat attery lying around... is there a way to make it work with my charger?