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In April 2019 bought a new battery for my Toshiba Satellite P55W C5200X from Amazon. I put the battery in on August 10, 2019. But after charging the battery says 67% after I fully charge it. Also last night after installing it, the battery initially was around half, then a few minutes later it says 9%. From more than 50% to only 9%. Is the battery defective? Did I wait too late to install it? Should I just buy a new battery directly from Toshiba?

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    Not all batteries are of equal quality, sounds like a really cheaply made lion battery, return it to Amazon and buy a different brand of battery.
    – Moab
    Commented Aug 12, 2019 at 12:18

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Waiting to install it likely had no impact -- Li batteries hold charge for years.

First thing, try resetting battery charging. The following applies to Windows OS:

  • In Hardware Manager, delete the ACPI-compliant control method driver.
  • Shut down completely (not hibernate).
  • Unplug the power supply.
  • Remove the battery.
  • Hold down the power switch for 30 seconds to drain any residual charge.
  • Put hings together and reboot: Windows should reinstall the driver by itself.

If that doesn't help, return the battery -- hopefully, Amazon would accept that, though a few months late. As for buying a new one, I've had good luck with third-party batteries; perhaps try another brand.

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