Hold F2 while booting, to enter BIOS. See if the AC adapter is recognized. If it is not, then that is the reason the system runs slowly. An unrecognized AC adapter, or one that does not supply sufficient wattage, will cause your laptop to run more slowly. There is likely a fault with at least one of three items: It's a process of elimination to figure out where the problem lies, or at least where it doesn't lie. For example, if your AC adapter is recognized and works on another Dell laptop, then the problem is likely your charging jack or charging circuit. You said that the battery port was damaged, so I'm going to assume that you meant the charging jack/port. The jack is a relatively inexpensive item that on many laptop models is not difficult to replace for someone experienced in working on laptops. You didn't tell us your laptop model, so I couldn't check, but on many Inspirons it can be replaced. It may be that it was not properly repaired/replaced. Or it could be that the charging circuit has a fault. Check if the light is lit at the plug end of the AC adapter or on the adapter block. And see if that light remains lit when you plug it into the laptop's jack. If the AC adapter's light goes dark when you plug it into the laptop, then the fault is likely with the jack or the circuit.  Try another genuine Dell AC adapter of at least the same wattage/amperage. If that second Dell AC adapter works, then the fault is likely with your AC adapter. If it doesn't work, then the fault is likely with the jack or the circuit.  If a good AC adapter and a new jack won't work, then the fault is likely with the charging circuit on the motherboard, which would normally require replacement of the motherboard. Also, it's worth trying a reset: There is a centre pin in the adapter's plug (the end that connects to your laptop's jack/port). If that centre pin is broken or bent, then that is the cause. If it's bent, you could try gently to straighten it. If it's not bent, clean out the connector with Q-tip and 99% alcohol, and do the same to the jack. Try slightly moving/jiggling the plug in the jack: if the light goes out or charging stops, then the problem is the charging jack or the pin in the plug. Run Dell Diagnostics:Press and hold F12 while booting to enter the One Time Boot Menu, select Diagnostics and press Enter. The Dell Diagnostics will test major hardware components. Choose to run extended tests. Whenever touching components or working inside a computer, wear a grounded wrist strap, also called anti-static wrist strap, ESD wrist strap, or ground bracelet. It's a cheap and sensible precaution. Rest the laptop on an anti-static mat or at least a reasonable alternative such as corrugated cardboard. (Repeatedly touching a metal case part is not sufficient mitigation with modern components.)
I accidentally damaged the battery port so the guy near my mum's fixed it but it's charging but slow and the game I play is relatively slow but then when it's fully charged it's okay thoughts? Also when I pull the charger out it works normally
My laptop is slow after breaking my battery port