eufy Rechargeable Battery for eufyCam S4, S330 3-in-1 Video Smart Lock, E330 Video Smart Lock, Smart Lock S230, Smart Lock E31 and Smart Drop, Black

Swapped this into my S330 lock without having to take the whole unit off the door, which was way easier than I expected. The 10,000 mAh capacity means I’m getting months between charges, and it’s nice not buying disposables again.

Bought this as a backup for our front door lock, and the 10,000 mAh capacity is reassuring—we've gone weeks without a recharge. Swapping it in takes about a minute, and it's nice not buying throwaway AAs every few months.

The swap is so easy I didn't even need to take the camera down—just popped the old battery out and slid this one in, took about ten seconds. It's charged up in a few hours and the 10,000 mAh has been running my smart lock without a hitch for weeks now.