My laptop battery recently decided to kick the bucket, so I bought a replacement. I charged the replacement for approx 4 hours and assuming it was fully charged (only took my last batt 4 hours) unplugged and went on my way.

Later I started up my laptop and the battery was only a 11% charged. Since I didn't have my charger, I used it until it hibernated and then plugged it in when I got home. Now, after 24+ hours of charging, it won't charge further than 0% charge. I tried to calibrate the battery (by discharging and recharging) however each time the laptop shuts of after only 5 minutes.

Have I wrecked this battery somehow by discharging it after only a 11% charge, or is it just a bad battery?

  • Is it an NiCD battery? Give us details on the batt, and the laptop. – wizlog Aug 11 '11 at 16:20
  • Laptop is an Acer Aspire 8920G and battery is 8-cell Li-ion, 14.8V/5200mAh. – John Aug 11 '11 at 16:58
  • Have you checked you AC/DC power pack to ensure it's outputting the correct voltage? – Ƭᴇcʜιᴇ007 Aug 11 '11 at 17:43
  • I haven't since the laptop works fine plugged in, and the other battery will charge (only to about 1%) on it.. – John Aug 11 '11 at 18:37
  • @john Is the Acer Aspire battery you bought the exact same one you had? – wizlog Aug 11 '11 at 19:51

AFAIK, manufacturers typically want you to charge the batter for 10 to 12 hours, EVEN if the light says its charged. While, yes, it doesn't have memory problems, something tells me a fresh battery has other issues that cause the OS to misjudge the capacity, this giving you weird readings.

  • Yeah that makes sense. However I did charge the battery for over 24 hours after I plugged it in again and it still wouldn't hold more than a charge to power the laptop for 3-5 minutes. Also, I've been charging it through the laptop, not on an external charger. – John Aug 12 '11 at 16:43

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