Dell N5110 issues with battery and performance

Apr 26, 2019
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Need help trying to find the solutions please and thank you
The Laptop turns on perfectly fine but runs very very poorly, also the battery percentage won’t exceed 5%. As soon as you unplug the AC Adapter from the laptop the computer runs Outstanding results, but if I connect it back again, it almost feels like the laptop haves a huge lag.. And I tried running the computer on High Performance and Low Performance, and battery saving, but I still end up with the same results..
please help..
 
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