What is your normal charging process, meaning do you charge frequently or once a day, and do you let the phone battery die or charge before?
Have you practiced any "training" of the battery by either allowing it to drain fully, or trying to "bump" charge the phone?
When charging, is the phone powered on or off?
When charging is the phone still in the case, and if so what kind?
When charging are you using the stock Motorola charger, a USB adapter to a computer, or a third party charger?
When charging, have you noticed the phone getting excessively hot?
Do you leave the phone in direct sunlight, such as on a dashboard of a car or truck for periods of time during the day?
When using the phone, is it not only in the case, but also in a bag, pocket or briefcase and simply being accessed through the Bluetooth?
Answers to these questions will help us ALL to identify and avoid any things we may think are normal, which could contribute to battery failures.