Chosen Solution
Randomly the other day I went to go plug in my charger & it wouldn’t charge.. it said it was charging but it didn’t have the green light & it was still on 4% after I had it on for an hour well after a day or two it died completely. When I put it on charge it still said it was charging but wasn’t, I couldn’t turn it on so I searched YouTube videos & some unplugged the battery source so I did that & plugged the charger to it.. my computer would turn on if I had the battery unplugged & the charger connected but when I plugged the battery back in it would cut off, so right now I’m trying to update it while the battery is unplugged & it’s on the charger but it’s a struggle because every 10 minutes it keeps cutting off & I have to unplug the charger, plug it back in, & cut it back on to finish the update.
It’s not normal in any circumstance that power would be missing every now and then, even with no battery, therefore you should be able to complete your whatever task without a problem. First thing to try is to borrow or buy a replacement charger, after checking your magsafe connector and plug are fine and there’s no dirt. If this doesn’t solve your problem issue might be more complex.