Magic Mouse charging percentage changes after unpluging
Have a Magic Mouse, version 1.9.2.
Plug into iMac (iMac19,2) to charge. Starts at 3% but won't go above 84%.
Disconnect charging cord from the Magic Mouse.
Still shows connected via Bluetooth but now battery shows 3% again.
Mouse clicks and movement are not registered on the iMac at all.
Same thing happens if I plug into an external outlet. Will show charging. Unplug when reach 40%. Then charge value immediately updates to 3%.
Suggestions?
iMac 21.5″, macOS 10.13