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psafux
Premium,VIP
join:2005-11-10
kudos:2

1 edit
reply to koam

Re: Laptop battery not powering computer, charged 97%

There are several components in the charging system of a laptop. A good battery does not necessarily mean the system will run from it and a bad battery does not necessarily mean the system won't.

The extent of normal troubleshooting involves checking whether the system will operate with and without the battery installed, with & without the AC power cord installed. If you have the ability to isolate the system by testing the battery in another (similar) system that would be about the most that normal techs could do. If the battery has a self-health / self-check option you can use that but there isn't really a reliable way to test batteries aside from in their normal environment (plugged into the system).

The fact that it only charges to 97% and no further does indicate something askew with either the battery or the charging system on the laptop (motherboard).

Based on your description I would be comfortable saying the motherboard battery is shot without second-guessing myself. The charging system is embedded & non-serviceable.

edit: no clue why I said motherboard above, meant battery. Battery is likely culprit based on description.


koam
Pink Pecker
Premium
join:2000-08-16
East Puddle
Reviews:
·OTT Communications
·Shoreham Telephone
Thanks.

Troubleshooting steps we've done are that computer runs on AC power whether or not battery is in. Computer does not run without AC power cord.

Windows Power manager sees when the battery is in, as do the system LED battery indicators.

We don't have a 2nd battery to test in the computer and don't have a 2nd computer to test this battery in, though may find a friend who has one or the other in the next few days.
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psafux
Premium,VIP
join:2005-11-10
kudos:2
please see my edit - i mistyped earlier. i would NOT say the motherboard is bad based merely on the info provided. Could be but it wouldn't be my first choice.


koam
Pink Pecker
Premium
join:2000-08-16
East Puddle
Thanks


Camelot One
Premium,MVM
join:2001-11-21
Greenwood, IN
kudos:2
Years ago there was a "virus" floating around, one I assume written by a punk to prank his friends. It was a vbs script that would set the registry flag for "shutdown" battery level in XP to 90-95%, causing windows to shut down almost immediately when it went to battery power.

I haven't seen it in a very long time, but it is easy enough to check. Start the laptop on AC power and enter the BIOS setup, then unplug power and see if it shuts down. That would test actual juice coming from the battery to the motherboard, rather than any sensors or meters that trigger events. It would also help you rule out any other sort of windows corruption being at fault.

But I agree with the others, I think its just a bad battery.


koam
Pink Pecker
Premium
join:2000-08-16
East Puddle
Reviews:
·OTT Communications
·Shoreham Telephone

1 edit
Thanks. Interesting.

I don't have the laptop with me. The effect when I unplug the AC cord is exactly the same as if I had unplugged the AC cord with no battery in. Normally in windows if the battery reached shutdown level, it goes through a few seconds of entering Sleep or Hibernation or an orderly shutdown of windows and power down - this is different.