Sorry, Just popped it open to take some photos for you.
Front of board has Battery Fuel Guage, Quad OpAmp, Linear Reg and a few FETs
BQ2014
LP324
LM2936
4435 (Q2 SO8)
50WQ04
Back of board has µC, comparators and a large FET
PIC16C54A
LM339
LM339
M50P03
I am going to guess the charging is done by the PIC and I think because it has a C rather than an F in its name it is write once isn't it.
Doesn't look like an easy mod to change the charging logic