MBP Battery Drain while Shutdown

[dgrizzell]

I've got a 17" Macbook Pro from May of 2007 that is serving me well now in my last year of college. The battery health began to deteriorate last year so I replaced it with a new one from Apple (a hefty $120).

Recently, the past two times that I have left for class (with my MBP fully charged) it has drained while shutdown (completely turned off NOT just "asleep"). When I say it drains, I mean it has roughly 2-5% of its battery life left giving me about 20 minutes of power until I get back home for the day.

Here's the kicker: the battery is in good condition with plenty of cycles left (see system profile for power below.)

Any thoughts? Try a new battery? Could it be the charger? What system components, if any, run during a complete shutdown and could these be malfunctioning?

Any thoughts, comments, or suggestions are greatly appreciated.

System Profile - Power

Battery Information:

Model Information:
Manufacturer: SMP
Device name: ASMB014
Pack Lot Code: 0002
PCB Lot Code: 0000
Firmware Version: 0110
Hardware Revision: 0500
Cell Revision: 0102
Charge Information:
Charge remaining (mAh): 4523
Fully charged: No
Charging: Yes
Full charge capacity (mAh): 5865
Health Information:
Cycle count: 220
Condition: Normal
Battery Installed: Yes
Amperage (mA): 2534
Voltage (mV): 10818

 

[MacModMachine]

alot of things can cause this,

a short somewhere in the laptop , a bad charge circuit.

i take it you have tried resetting SMC?

how about pulling the battery, testing the battery out terminals for resistance, this should pinpoint any shorts.

 

[dgrizzell]

alot of things can cause this,

a short somewhere in the laptop , a bad charge circuit.

i take it you have tried resetting SMC?

how about pulling the battery, testing the battery out terminals for resistance, this should pinpoint any shorts.

SMC reset does nothing. I don't have the tools to do electrical tests on the battery itself (as cheap as they are.)

 

[DannySmurf]

SMC reset does nothing. I don't have the tools to do electrical tests on the battery itself (as cheap as they are.)

Well, if you're going to troubleshoot this yourself, you may want to get some. There are a lot of things it COULD be. Without a bit of equipment to test the components, the best you're going to be able to do is guess-and-test each component until you find the culprit (very expensive).

 

[dgrizzell]

Well, I just did a second SMC reset out of shear desperation and it appears that was what I needed.