I've brought a NP300E4ZAO6IN , free DOS Samsung notebook from flipkart & Installed windows 7 ultimate in it . Just after 30 days, I noticed the laptop's charge level doesn’t increases from 22% even though when I plugged in the AC and windows shows "plugged in , charging". the LED also turns red indicating the laptop's battery being charged but the battery level is stuck 22% & it decreases it is unplugged (runs on battery).
I goggled a lot and
►kept the AC plugged in for overnight
►Cleaned the battery pins
►Performed a reset by removing battery and prolong pressing of power button.
► uninstalled & reinstalled the Microsoft ACPI battery driver from device manager
►Updated the BIOS
►Recalibrated the battery
None of them helped, I took the laptop to Samsung service centre (SSC). I don’t know what they did but worked fine again . On asking they said windows 7 wiped certain files and he fixed them.
On the very same day the issue came back. I went to SSC and they solved the issue again but this time they said he fixed nothing the laptop turned ok on its own. Now this cycle continued thrice, then SSC finally
►Replaced the battery with a new one
but the problem still persists but at different Charge level.