Laptop battery won't charge

This issue can be one of 3 things. First make sure all connections between the wall and the laptop are plugged in fully and firmly (Do not apply excess pressure.). If your laptop still does not charge and you find that the plug on the laptop is not firm and wiggly then it's likely the power jack on the laptop that has broken and may need to be repaired at a shop. If the connections are all firm and it still will not charge the issue is likely either the power adapter which can usually be easily replaced with either a manufacturer replacement or a universal adapter. Now if thats not the problem then it may be the charging circuit which is usually part of the main-board, as main-boards are usually a good portion of the cost of a laptop labour aside as it is time consuming to swap out main-boards on laptops, it's generally less cost effective to repair than replace at that point.

Obviously repair costs can be mitigated somewhat if you are mechanically inclined enough to do them yourself and can source the parts needed.

Try with a different battery.. A simple way to check the integrity of the battery is to remove it entirely and try plugging in the laptop. If the laptop powers on properly, the problem is likely a bum battery.

Breaks, Burnout, and Shorts

Feel along the length of the power cord, bending and flexing as you go, to check for any kinks or breaks. Check the ends for any broken connections, such as plugs pulling loose or spots that may have gotten chewed by a pet or caught in a vacuum cleaner. Inspect the AC brick. Is it discolored? Are any parts warped or expanded? Give it a sniff—if it smells like burnt plastic, that's likely where the trouble lies.

Several internal parts can cause problems when they malfunction or fail.

Common culprits include a faulty motherboard, Several internal parts can cause problems when they malfunction or fail.

Common culprits include a faulty motherboard, wonky logic boards, damaged charging circuits, y logic boards, damaged charging circuits