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Battery could be dead and won't hold another charge. Batteries only last for so long until you have to replace them. If you laptop is ok with the AC Adapter & Power Cord meaning it boots and allows you to work in windows, then the battery is definitely dead.
As you say the system is 4 years old update the bios your download link is here! IMP. Be sure to plug in the battery and it should be charges above 10 % and the system should be connected to the mains power supply also ensure there will not be a power outage during the update process this will resolve the issue 100 % Dont forget to say thanks!
Check battery indicator. If OK, update BIOS. If no change, check battery bios info, if AC Adapter is incorrect, replaces it. Please comment if the information provided has been helpful for the improvement of my support assistance. Thank you and regards.
Bad AC power adapter
Bad internal power jack (where the plug goes into the laptop)
The easiest thing to do is to try and use your laptop with the ac power adapter plugged in and no battery. This should work but if it doesnt then you know it probably is your ac power adapter. But if you feel like you have to wiggle and hold the cord in then it may be the jack on the inside. The only way I know how to fix that is to take it apart and resoder the joint holding that part together to make a stronger electrical connection.
As for the battery if you let it sit out for a day it will discharge any current it currently has inside of it and then you can try again to charge it. If that doesnt work and your cord and jack seem fine then you will need to look for a new battery to replace the one that died. This happens over a couple of years as the battery life shortens over the life of the laptop and more so if you use it heavily.
1. remove all external peripherals
2. try to use ac adapter alone check if laptop will power on.
3. put back batt in with ac adapter.
4. check bios (power on laptop keep tap on F2)
5. check for the bios version, battery info and battery health.
6. check if batt is 0% or 10% charge
7. check battery health and info if the ac adapter is determine or not. also check if batt is performing normally.
8. if batt has 10% charge then download the latest bios for your system. download it from support.dell.com