Battery was giving wonky readouts (had charged to 100% on first use, let it sit for a day, went to 0% (idle+standby all day, what?), unplugged the battery without charging -- another readout 14%, then 5 minutes later the Pandora shut itself off).
I was getting a large number (somewhere near 120% over capacity readings for a while) and other unknown variables on status (System Information thinks the battery is only 90% full, another time it said 100% when it /was/ only at 90%, sometimes it doesn't even know). Voltage and current are correct, however.
The charge turns off at ~4.195V (battery doesn't get exactly 4.2V, tried pulling the charger a couple times, powered off/on, to see if it was an OS thing - so this should be good enough to set max charge calibration), current about ~50mA before cutoff (decided to not boot to OS to squeeze extra charge in there, though it's only saving by 0.01~0.02V). Unplugged within 5 seconds of charger being cut.
Crossed fingers that System Information will be reporting the correct values now from proper 100% now. Kinda a pain that the battery has to be recalibrate new, but oh well, that's about the only small issue I've had thus far with said device.