You should first clean the battery terminals. Use a pencil eraser or a cotton swab to gently rub the contacts on the battery and the device. Be sure to apply a little pressure as the battery contacts could be slightly oxidized.

You should also examine the battery for cracks or damage. If the battery seems damaged, replace it.
If you’re in need of a quick fix for your headphones and you don’t have the means to fix them, there are a few things you can try before writing them off.

You can fix your headphones with a needle and some sewing thread. If you’ve broken the cord, you can actually fix it yourself without having to buy a new pair. The first thing you’re going to want to do is cut off the broken part of the cord, as close to the headphones themselves as possible.
After a lot of digging, I found out that the problem is actually in the Windows 10 OS. If you have Windows 10, you can read about the issue here and here. The good news is that the problem can be fixed by disabling a few settings on the Windows 10 OS.
Hi there, the easiest way to fix this is to do a full factory reset on both of your phones. My wife and I have iPhones and an Android phone and I have had no problems syncing them all. You'll need to back up your data on iCloud or whatever backup service you use before you reset.
The best way to fix a hole in a plastic boat is to fill it with something that is non-flammable, like water. Of course, if you’re in the middle of the ocean, you’re going to have to find a source of water to fill the hole with.