A method for predictive analysis for maintaining a battery charge of a personal monitoring device is provided. The method includes: locking the personal monitoring device to a limb of a monitored person; collecting historical information about the personal monitoring device including movement data of the personal monitoring device and battery charging history of the personal monitoring device; analyzing the collected historical information for patterns of battery charging behavior; receiving a current location of the personal monitoring device; determining whether to send a battery charge reminder to the monitored person, based on at least a current location of the personal monitoring device, a current batter charge, and the patterns of battery charging behavior; and providing, in response to a positive outcome of the determining, a notification to the monitored person to charge the battery.