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The batteries on the eufy Smart Lock C210 can last up to six months based on an average usage of unlocking and locking the door 10 times per day. Please keep in mind that the actual battery lifespan may vary depending on your specific usage patterns. As for replacing the batteries, the Smart Lock uses 4 AA batteries, which are included with the product. These batteries are non-rechargeable and easy to replace when needed. Simply ensure you replace them with similar AA batteries for optimal performance.
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