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No, there's no way to monitor the battery life on the HMIGTO's. The primary battery is non-rechargeable, and is used for data backup of memory and the internal clock. If the primary battery is depleted, the backup data is lost. One month before the primary battery is completely depleted, an alarm will beep to indicate it is time to replace the primary battery. The battery replacement part is an HMIZGBAT (sold separately).