ClydeCrashKop said:
A laptop battery is not just a battery. I did an autopsy on one and they have an elaborate circuit board wired or sensed in parallel and series.
that circuitry is a battery supervisor circuit, providing some basic functions, to prevent your battery from doing a 3-mile island style meltdown
1) short circuit protection
2) prevent excessive rate of discharge
3) prevent excessive rate of charge
4) prevent over voltage charge
5) prevent deep cycle discharge
6) prevent excessive cell temperature
7) monitor and report individual cell health
8) record battery statistics, date of manuf. and unique serial number
9) provide "fuel-gauge" calculations; state of charge, discharge rate, run-time remaining at current discharge rate, charge-rate, charge-time remaining, etc.
7 to 9 are mostly features of newer "smart batteries"