Hey @AdamN! You are correct, the Keypad battery is internal and not removable. Each charge should last up to 7 months depending on usage, and much longer if you are frequently using the plug in adapter as a power source. If you feel the Keypad battery is not holding a charge, or charging, we recommend reaching out to our support team, who is always happy to troubleshoot and advise the best steps to take! 
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