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.

I'm using these batteries on my Blink doorbell. Alkaline batteries do not last very long, so I'm going with lithium. The price of these batteries is much better than you will find anywhere else. You don't need a high price and a brand name for a quality product.

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They replaced the defective unit free of cost I changed the rating to 4 from 1 based on their customer support. Let’s see how the new unit works. ————- I bought u-bolt-pro-WiFi by u-etc back in March 2024. The app recommended that I need to buy u-tec lithium batteries too for better performance. Two and a half months later, my lock stopped working. Called support and they suggested, I should just use normal alkaline batteries. The lithium batteries are u-tec branded. What a waste of money. He would refund or send me replacement batteries.

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.

I ordered batteries and it included defective ones. When I went to use them they said that I cannot return them because it is past 30 days. No way I could know until I used them. Site indicates it is distributed by manufacturers but when I call UTEC they tell me I have to go through Amazon. Very poor quality control and service recovery. So do not buy them!!!!!

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!

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.