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I have a Dell Inspiron 5521 running Windows 8.1.Recently, I had replaced my battery.But my battery indicator shows 100% available ( plugged in,charging) status. I calibrated the battery but no difference. Battery is still in good condition and it still holds a 4-5 hours talk time.

What should I do to fix this problem or is it safe to continue using with AC power. Charging indicator bulb is turned on all the time so I feel that the laptop tries to overcharge the battery. Will it reduce the battery life?

  • Li-Ion batteries will actually explode if over-charged. I'd make very sure it is not still charging when the battery is actually at 100% – Tetsujin May 30 '15 at 12:40
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    Battery charging is controlled by the motherboard bios firmware not the power brick. – Moab May 30 '15 at 13:01
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    Was the new battery a Dell battery? – Moab May 30 '15 at 13:08
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    The battery has electronics in it that does not allow overcharge, overdischarge, overtemp and probably overcurrent. So it should not explode or anything. – Dan May 30 '15 at 19:03
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    Any device will malfunction now and then (even the space rockets, see latest news). But genuine (big emphasys on genuine) batteries exploding, that's rare (between other things, there usually is an actual thermal fuse in the battery pack) – Dan Jun 1 '15 at 14:47
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Best way to full discharge the battery (calibrate it) is to drain it as low as you can while in Windows, then restart the PC and enter the bios setup screen, leave it in setup until the battery drains and turns off the PC, then plug it in and let charge for a few hours before turning it on.

If no joy, try this. It may or may not remedy the issue:

  • Disconnect AC
  • Shutdown
  • Remove battery
  • Press and hold power button for 30 seconds
  • Connect AC only (no battery)
  • Startup
  • Open Device Manager
  • Click the plus (+) sign next to Batteries category, right-click all of the "Microsoft ACPI Compliant Control Method Battery" listings, and select Uninstall In the "Confirm Device Uninstall" dialog box, click OK. (it’s ok if you only have 1 of these).
  • Click the plus (+) sign next to System Devices.
  • Right-click the “ACPI Fixed Features Button" and select Uninstall. In the "Confirm Device Uninstall" dialog box, click OK.
  • Shutdown
  • Disconnect AC
  • Insert battery
  • Connect AC
  • Startup
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Dell has a (Laptop) charging system that is unique to other manufacturers. It incorporates a monitoring system based on technologies created by 1wire.

It is imperative that you use a "Dell certified" charger (and battery). Or the system becomes unreliable, or broken. Even if the charger has the same "specs" -- power ratings. As such; if you, or a previous owner has used anything but that "Dell certified" charger. The charging system, and battery level indication will have been compromised. I am not saying this because I am a Dell employee, or affiliated in any way to Dell Inc. (I am not) in an effort to ensure you buy only Dell products. I say this because of research I performed before purchasing a new (Larger) battery for my own (Dell) Laptop.

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