Motorola XT720 Instruction Manual page 13

A chargeable battery is consumable.
The repetition of charging/discharging will shorten its operation time gradually.
When the phone is not being charged properly, lamp on the charger will blink.
Check the charger to avoid the trouble that may occur to each device.
Mobile phone and battery cover need to be combined at all time.
If not, it may cause malfunction.
In case of separating a battery from the mobile phone, please turn off the power.
If not, it may cause malfunction.