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This is the replacement rechargeable lithium battery for Familock S3, S3 Max and E40 smart locks. It is rated at 15,000 mAh and charges over a standard 5V=2A input, so it keeps the lock running without disposable cells. It suits owners whose original pack has worn out or who want a spare to swap in during charging. Buyers rate it 4.6 out of 5, and the main thing to check is that your lock is one of the three listed models.
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Lowest price we've seen: $29.99 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
Buyers rate it 4.6 out of 5 from 15 ratings, with the feedback centered on it working as a straight replacement.
This is a rechargeable lithium battery that powers the Familock S3, S3 Max and E40 locks.
