New laptop Battery only charges to 88%

Battery biz Hp/compaq presario 1500, 280...
January 4, 2010 at 18:06:29
Specs: Windows XP
The battery charge light on my laptop was always red, so I bought a new battery thinking the old battery must be due for replacement (it's 5 yrs old). The new battery will only charge to 88%, and the charge light still stays on red. Maybe the old battery wasn’t crook after all. I’ve tried discharging the battery down to 50% and recharging it, but when it gets to around 88% it seems to stop charging. The power adapter is quite hot when first charging but then cools down as if no (or little) power is being used when it gets to 88%, and the laptop charge light remains on red. Any suggestions as to what the problem may be?

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#1
January 5, 2010 at 07:51:46
Either the charge system is bad or the way it reports is bad. I doubt the old battery could be that good. The only issue would be is if you are really trying to keep charging a 100 % battery. It could make it fail sooner or even get hot enough to do damage.

Playing to the angels
Les Paul (1915-2009)


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#2
January 5, 2010 at 14:04:18
Les, Thanks for your reply. The old battery is in the recycle bin and I agree with you that at that age it is probably past reliable service. I've since worked out that the power adapter only gets hot when I have the screen on (probably drawing a lot more power). I've since discharged the battery completely and recharged it again overnight "with the laptop off", and it charged to 87%. I'll do that a few times and see what happens. Reading other blogs it seems one may be able to "reset" the battery monitoring system or battery internal microprocessor itself, but I haven't been able to find any definitive advice on this as yet. I'll report back after I've done a few discharges / recharges. Regards Barry

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#3
January 5, 2010 at 14:34:41
Much of the battery monitoring could be part of the actual battery. I kind of doubt you can reset it.

I tihnk it should have powered up to at or near 100 when you installed it and let it charge for the recommended time.

Playing to the angels
Les Paul (1915-2009)


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Related Solutions

#4
January 6, 2010 at 02:13:44
Amazing !! I've discharged and recharged the battery 3 times, only turning the laptop on after a few hours to check the battery level. It now says battery level 100% The battery LED is still glowing red though, and the power supply is a bit warm, so perhaps it hasn't reached it's full capacity. I'll leave it plugged in overnight and see if the LED changes colour by morning.

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#5
January 6, 2010 at 14:11:55
After charging all night the battery LED is stil glowing red, although the power supply is now cool (no heavy power drain). I downloaded the service manual from the HP site and to my surprise found that on this laptop the LED doesn't change colour when it is charged (as my other new laptop does), only blinks when operating on battery and the voltage is low. Funny how we sometimes fail to recognise common operating principles of our equipment, when we don't use them regularly and newer systems work differently.

Summarising: The reconditioning process of discharging and recharging the new battery certainly took the charge voltage from 88 to 100%.

Many thanks for this forum and the kind responses from people I would never have otherwise known. Regards Barry


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