Laptop shuts off abruptly

Hi,

I recently replaced the battery of my Presario notebook, a high-capacity battery rated at 8800mAh. I did the normal 'preparation' steps with it, and it went fine the first time. Battery lasted for 3:30 on moderate usage.

However, after that, the battery/laptop starts acting up. The laptop will abruptly shut off when the battery level reaches about 40%. Why is that?

When I power it back on, the meter says 6% (charging).

I've tried it many times, it always shuts off without warning at about 40-45%, and powers back on at 6%.

Could it be an overheating issue? The laptop's fine when it's plugged into the AC (both with the battery connected and without).

 

where'd u get the battery?

 

Got it from a 'PC and laptop supplies' store in milwaukee (i'm in michigan - was there on vacation). Is that the reason? Third party parts? How do these guys stay in business if the batteries suck?

Update: I tried charging it to 40% and then running it on battery alone. This time it went down to the warning level, asking me to 'replace the battery or switch to a power outlet to avoid losing your work'.

Weird. Will test it again on 100% charge.

 

Still the same. Laptop abruptly shuts off at random power level. used to be 40% but twice has happened at 65%.

Could the fault lie with my laptop?

 

It means the battery and/or laptop is not calibrated correctly. The machine assumes the battery is new and calculates the time remaining based on that assumption. When the laptop thinks the battery is at 40-60%, the battery is actually completely drained, so the machine just shuts off.

Or I think it's something like that. Happens to my older machines all the time.