Battery Health significant drop within minutes?

[M. Malone]

Hello,

Yesterday I had my MBP Classic with 89% battery health full charged.

I decided to play Warcraft 3 for a bit, after 3 minutes I get the battery warning message, I was surprised that a battery that lasts 5 hours just the day before died this fast.

So I check out iStat pro and it says my battery health is at 19%

now my mac can't stay charged for longer than 40 minutes or so.

how could this be explained?

 

[jmaquarry]

your mac may be out of sync with your battery?
have you tried letting the battery COMPLETELY drain then charging to 100% before switching on...
this may restore your battery health -

 

[misterredman]

Right. Try calibrating your batterylike described here:

http://support.apple.com/kb/HT1490

Be sure to follow the pricedure exactly.

If you still have the problem I guess you will need to take it to a store.

 

[maflynn]

As the others say you need to calibrate the battery, I believe apple recommends that you do that every 6 months. I only do it when I see symptoms that you're currently experiencing.

 

[M. Malone]

Sorry for the late update.

Thank you to everyone who posted, I did exactly what you all said and it worked perfect.