Tag Archives: batter

Smart Battery Hacking Progress!

I finally made some progress on reading out data using the “smart battery” interface on laptop battery packs. I’ve succeeded in pulling a number of useful numerical values from three different MacBook Pro batteries from two different manufacturers and one Acer battery pack. I have, so far, failed to get anything out of a different model of Acer pack, an ASUS pack, and an HP pack, but I have some ideas about what to try next. I also have to do more work to make sense of a few of the values I’m getting, and figure out how to read out string data, and figure out if I can get at voltages for individualĀ parallel banks of cells.

In the meantime, here is what I got out of an old Mac battery:

NuPower
Design Capacity (mAh): 5800
Design Voltage: 10800
Manufacture Date: 15400
Cycle Count: 531
Voltage: 12.23
Full Charge Capacity (mAh): 3073
Remaining Capacity (mAh): 2812
Relative Charge PCT: 92
Absolute Charge: 48
Temp: 31.85
Current (mA): 0
Minutes remaining for full charge: -1