BatteryInfo is the best charging application for BlackBerry devices. It will display the current battery percentage charged, battery temperature, date and time, visual battery graphic and optionally custom wallpaper whenever you plug the BlackBerry into the charger.
If you use USB charger then wallpaper will not work since access to the SDCard or internal memory is not allowed when Mass Storage is enabled.
You can disable mass storage in the Options application.
Works great with wall charger.
Note: If you have the Storm you need to Disable Compatibility mode in the Options->Advanced Options->Applications application for BatterInfo.
To disable the Storm clock showing when charging run the Clock app and select Options from the menu, set When Charging: popup to Do Nothing.
· BlackBerry OS 4.2 and higher