While plugged in, my Macbook is usually around -640 Milliamps. Shortly after being plugged in, it goes to ~2000 Milliamps. My friend's however has water damage, so when hers is plugged in it stays at -3 Milliamps. Her MacBook is totally unusable without being plugged in (reads at about -700 Milliamps), freezing, crashing, spinning beach ball. Doesn't seem to have problems while plugged in. Obviously a battery replacement would help, but what are the chances it would completely fix the problems, when an OS restore didn't help at all?