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If it's the same as the 600, the battery indicator probably needs to be calibrated. This may take a few cycles for the firmware to realize the battery is not really draned, but wait until the battery is completely dead then do a full charge (ideally with a mains/wall charger) overnight. Once it is charged then use as normal until the battery completely dies again. You may need to repeat these steps a few times before you begin to see an expanded battery life.
Also, I notice prolonged life if I shut down the device each night before turning off my bedside lamp. My battery lasts 2-3 days longer than using just the standby mode.
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