Battery level for mouse and keyboard always 100%

The battery level shown in the bluetooth menu and in the system preferences mouse and keyboard panes constantly shows 100% and never declines. Does anyone know the solution to this to start getting realistic readings again? I've tried trashing the bluetooth plist and restarting but that hasn't made any difference.
Many thanks for any help
James

One suggestion I have is to do a "full factory reset" of your bluetooth stuff. I'm not precisely sure all that entails but here's how you do it.
1. If you don't have the XCode developer tools installed then install them.
2. Launch the Bluetooth Explorer. It can be found in /Developer/Applications/Utilities/Bluetooth/.
3. In Bluetooth Explorer's Utilities menu select Modify Software & Device Configuration. A window will be displayed with a number of checkboxes.
4. Check the first four checkboxes (Recant..., *Full Factory Reset*..., Delete link keys..., Delete global bluetooth preference...). They may already be checked for you as the default.
5, Click the Perform actions button.
6. Click Reboot NOW button.
After rebooting re-pair your bluetooth devices. Hopefully your power percentages will be fixed too. If not, I have no other suggestions.

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