Hey guys, I'd like to use a CR2032 coin cell battery with my IGS PGM motherboard, but I'd like to properly disable the charging circuit so I don't risk having the battery explode. I've followed this tutorial and removed the 470 ohm resistor as well as the D2 diode, then installed the battery holder: www.jamma-nation-x.com/jammax/tutorials.html#pgmbat However, I'm still reading 3.7v when touching the positve/negative pads for the battery holder while the system is on and no battery inserted. I know some people just leave the charging circuit enabled and use a non rechargeable battery regardless, but I'm hesitant to do this. I was reading ~4.4v before removing the D2 diode, after removing the resistor. I've confirmed there is no continuity between the resistor pads. Anyone have any ideas on what may be allowing the trickle charging circuit to continue to function?
The datasheet says the ml2032 can accept a max of 3.5v, whereas the pgm board is putting out 3.7-3.8v. Also, it has a 40mah capacity versus 225mah on a cr2032.
Yeah, but the ML2032 will be recharged when you use it - the 225mah of the CR2032 is fixed. You will probably find the voltage drops a little when a battery is installed.
Wouldn't a LIR-2032 battery be a better fit, as it's a 3.6V battery? The datasheet says to charge it at 4.2V, but the PGM board is now putting out ~3.7V on the battery pads -- so it would probably work, but not recharge the battery or be hazardous? Any idea why removing the diode and resistor would have dropped the voltage from 4.4v to 3.8v? Would that mean that the recharge function is actually disabled and it just needs a 3.6v battery?
Thanks again for the advice. A ML2032 dropped the voltage to 3v after performing the JNX battery mod.
