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This is a 4-cell battery; before opening it up, I was under the impression that it was a 3-cell.
The charge controller circuit board has "LIP8198" and "1-867-277-11" markings in the silkscreen, along with a strip of Kapton tape over the top of the PCB.
The PCB has +/- going to the 4 cells in series, as well as leads between each cell (probably for measuring voltage at each intermediate point), and two temp sensors: one on the battery closest to the circuit board (the one that the board's "-" connects to) and one on the next one after that (the middle-most one).
The top side has the following ICs:
The bottom has the following:
With a bit of digging, it seems that the bq80201 is used for many different battery makes such as Sanyo, Dell, etc.
Battery EEPROM Works (Software; not affiliated with this site, I have no guarantees of how well it works)
Battery EEPROM Works Forum topic re: B80201 support (Forum Thread)
Would still be nice to actually find a listing of the I2C codes that it uses.
|Model||Canon EOS 50D|
|ISO Speed Ratings||400|
|Exposure Time||1/60 sec.|
|Flash||Flash fired, compulsory flash mode.|