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  • What laptop model? How old is it? Batteries fail and die, often far sooner than the rest of the laptop. What led up to this failure? Was it a sudden failure, working fine one day and not at all the next, or did it slowly lose ability to hold a charge, or something else? Please EDIT your post to add this and any other information helpful to our understanding your situation.
    – music2myear
    Commented Jun 11 at 22:06
  • Batteries die. Replace it. Just because you have some voltages at particular points doesn't mean that the battery is healthy. It might have a whisker internally that makes contact when warm or current is drawn and so the laptop can't draw current from it. Batteries are not like other solid electronic parts, they are a constantly deteriorating chemical reaction and if the battery is more than 4 years old and starts to have problems then the best you can do is send it to a recycling place and buy a new one.
    – Mokubai ♦
    Commented Jun 11 at 22:11
  • It's older than 4 years. I had an experiment where I kept the charger on for a few months to see if the battery would last. I guess my experiment broke it. I was just wondering, since the cells are showing +14 volts if there's a chance I could fix it.
    – Clint William Theron
    Commented Jun 11 at 22:41
  • The "small black component" could be a diode or fuse, and we can't guess without knowing exact make and model and someone with electronics knowledge would need the battery in front of them and even if the problem is that component it would require more than a multimeter to replace. Either take it to a repair shop or buy a new one, though a repair shop would likely charge more than the cost of a new battery.
    – Mokubai ♦
    Commented Jun 11 at 22:53
  • 2
    Batteries, even internal batteries, are relatively simple to replace. Purchase a new battery if your laptop is otherwise working fine. There are limits on the value of support we can offer here for hardware issues, but, in this case at least, it is simple: replace your battery.
    – music2myear
    Commented Jun 11 at 23:50