U-tec AA Ultra Lithium Battery (Pack of 4), 3000mAh 1.5V, Longest-Lasting AA Battery, Up to 10 Years in Storage and No Leaks Guaranteed, Works in Extreme Temperatures, Non Rechargeable

My digital door-lock needs 4 AA batteries to run and as usual I was using alkaline AA batteries. Unfortunately, these batteries do not last long enough (maybe due to heavy usage in our door system). Frustrating, I opted for these lithium batteries to try on. It was costlier than Alkaline ones - no doubt. But, four months have passed, batteries are running strong till today. It is surely four times more durable over normal AAs. I am sure it would run for a few more months, too. And in comparison, cost wise, it is better too. I will go for these lithium batteries of this make, once again when needed.

Hi all, UPDATE: I thought I would write an update on the batteries from U-tec. While the batteries didn't last long, the company wrote me and asked me how they can better support me with the batteries, and they sent me another set of batteries for free. That's above and beyond service. Thank you U-tech! Thoughts these would have been perfect to fit my current U'tech key lock entry, but these batteries lasted less than a month. Any regular batteries work just as good or better.

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They lasted longer than I thought they would. I will buy again

5 out of 5 stars - Exceptional Performance and Long-Lasting! I'm thoroughly impressed with the U-tec AA Ultra Lithium Battery (Pack of 4)! I've been using them in my Blink camera for a month now, and they're still going strong! The battery life is incredibly long-lasting, and I'm blown away by their performance. These batteries have exceeded my expectations, and I'm so glad I made the switch. The fact that they're still powering my camera after a month is a testament to their quality and reliability. Highly recommended! If you're looking for batteries that will keep your devices running for an extended period, look no further than U-tec AA Ultra Lithium Batteries. They're a game-changer for the price!

These are awful batteries, and the company that makes them is even worse. After a short few months of use one of the batteries died, or rather changed polarity. Fortunately I had the key with me, otherwise I would have been locked out of my house. No battery warnings on the lock’s app neither (the lock is also from the same manufacturer as the batteries). Emailed the manufacturer twice from Amazon.com, and thus far no reply. What if I had a problem with the lock itself? Subsequently another battery died (or more, as this time I did not check them with a voltmeter), so now I replaced all 4 batteries with alkalines. A manufacturer should stand for its products, rather than ignore their customers. This one seems to opt for the latter.

Perfect for cameras .

I don't generally write a lot of reviews, but think this is worth mentioning. I purchased the same brand batteries last year. The battery warning light went off about 2 months in. Ordered this exact set again, and after a month, the batteries died. Ordered a 3rd time, but actually wrote down the date I installed them which was November 13th, 2023. By November 29th, was receiving a low battery warning on all my devices. I would say all my Blink cameras receive a moderate amount of traffic. I have my system set to disarm when we get home from work (5 pm), and back on at bedtime (10 pm). System is also set to disarm for a few hours in the morning, and on weekends when we are home. So really expected these to last at least 3 months. Unfortunately, this last set of batteries lasted 2.5 weeks. Officially purchasing an Energizer brand to get us through the winter.