Macbook Air battery/power issues

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dougal

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AmiBayer
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Hi... Can anyone help me with this weird problem please ?

Basically (quite often) when i open the lid of my Macbook Air when it has been asleep for a number of hours without the charger plugged in the batter shows up as 0% (even if it had a good charge before) and goes straight to sleep.

If i plug in the charger and take it out of sleep battery shows as a VERY low mAh (250 - 750) using a battery app and the battery meter says REPLACE NOW. The battery apps report it as a low health (3 - 7 %)

It also remains 0% and says charging.

Anyway, close the lid again and remove the power lead. Open the lid again and the battery is a normal charge again (in this case 89%) and says i have over 4200mAh and battery condition reported as normal.

The battery has just over 400 cycles and is reported to be 83% healthy using 2 different battery apps.

So cut a long story short, Mac asleep few hours open lid and 0% unhealthy (almost dead) battery. Close lid plug in power unplug power and open lid and battery back to normal.

Background... It is a late 2008 Macbook Air 2,1.. 2GB Ram, 128GB SSS, 1.6Ghz Core2Duo running OS X 10.6.8 Snow Leopard.

Recent changes: About 2 months ago I replaced the dying 120GB SATA hard drive to the 128GB SSD but everything worked well until 2 days ago with regards to this battery issue.

I have tried restting the SMC but the problem persists.
 
AFAIK The battery is self calibrating but i'll try calibrating it anyway.

I've been running on battery power watching Youtube with full sound volume, full screen brightness and keyboard backlight on for the last 1 hour. Trying to drain it.
 
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