Abstract: A device optimized battery-charging system for extending the useful life of a rechargeable battery. The optimized battery-charging system predicts periods of use and non-use of the device containing the battery and generates a schedule of when to charge the battery so the battery is ready for the next use cycle. During non-use cycles, the optimized battery-charging system reduces the battery charge level to an optimum level for storage based on the battery chemistry. When charging or discharging the battery, the optimized battery-charging system calculates a rate of charge or discharge that assures that the battery temperature does not exceed a preconfigured maximum value.