Ring doorbell won't charge but still recording

Our Ring doorbell won't charge. It's not hard-wired & we charge it as & when necessary. I put it on charge for a few hours but when disconnected from the charger the blue light goes out & the charge still shows as 12%. I have tried resetting the doorbell with the orange button for 20 seconds but that hasn't helped. I have also uninstalled & reinstalled the app in case it was that (it wasn't...) It does still record some stuff but you can't look at the live view as the battery is too low. Any suggestions?