Burflo S330 Battery for Eufy Security E330/S230/S231/S220 Video Smart Door Lock,eufyCam S4,SmartDrop T8790,Smart Delivery Box 3-in-1 T8520 T8520S T8520J11 T8531 E8531JY1 T8520T11 Rechargeable Battery

We have put this battery to the test and it is working fabulous! It's a great buy and top quality! I am very impressed with this item, along with how easy it is to install. As a family, we put our door to USE, always in and out not to mention all the pets who also set off the video camera recording. There's also a pick up box in the carport so those customers ALSO set off the video recording device. When I saw we TEST, we test to the MAX! Our battery which came with the Eufy was running down frequently, and needed to charge longer than overnight for us, which was a no go for me. Great to have the security of knowing what's happening at all times! If you're on the fence, don't be!

The replacement battery fits the lock perfectly, with no issues during installation. In terms of performance, it matches the original battery that came with the lock—reliable power, consistent operation, and no noticeable difference in responsiveness. Having a spare battery that’s fully charged and ready to swap in gives me peace of mind, especially since it means I won’t be caught off guard if the primary battery runs low. It’s a simple upgrade that adds convenience and ensures the lock stays dependable at all times. Well worth the price in my opinion.

I got this hoping for the best and was pleasantly surprised. I wanted another battery for my Eufy lock so one can charge while the other one is in use. After over a year it’s still going strong. It may actually be out performing the Eufy original battery. I’d definitely get another one of these.

I bought this battery to replacement since my old battery was not holding charge for more than 3 days. This one is still worse, After full charge battery didnot stay for more than 8 hours. I returned it now. Looking forward to buy OEM battery.

Lost the master key during moving. So it was as important to me to have another battery I could have charged to swap out without charge time. It fits and works perfectly

I bought this for my door's security camera lock so I can always have a battery ready to swap when the other needs charging. This battery fits perfectly and powers the device as expected.

Use it as a second battery for when my electronic doorlock battery dies. Works greats

**UPDATE** This company reached out to me unsolicitedly and offered me and SENT ME a full refund! This was extremely unexpected, especially in these times! So, while the product was not good, I am really impressed with this company. My original review: "This “new” battery held a charge ( brand new out of the box) for all of 2hrs. Get the name brand one and save yourself money in the long run. What a waste of money that was."