Apple TV remote won't charge

Did you charge as described, using the supplied Lightning-to-USB cable to wall outlet and a power adapter, or to a computer?

2.5 hours is enough. You shouldn’t have to charge often, but a year seems a bit of a stretch.

Charge your Siri Remote - Apple Support

There is a ‘repair’ program for battery issues with the Siri Remote, That could give you a 50% rate on a replacement out of warranty.

Battery service for your remote - Apple Support

if it will not charge you can attempt to use a match or toothpick to clean out dirt and lint from its connector if this does not resolve your issue you can purchase a new one Remotes & Controllers - TV Accessories - Apple