Energizer Ultimate Lithium 9V Batteries (2 Pack), 9 Volt Lithium Batteries

Long lasting battery

So I see several reviews complaining about these not lasting 10 years, these have a 10 year SHELF LIFE not a 10 year USE LIFE- those are 2 entirely different things. 10 year shelf life refers to how long these will be viable for sitting on a shelf/stored not plugged into anything. As far as actually putting these into something you can expect use-life to be about the same as a typical 9V or a little longer. I bought these to power the Fishman Fluence active pickups in my guitar because these types of batteries provide very consistent power - which is where these excel compared to your average alkaline 9V which can waver a little in power getting worse over time. The only issue with these is they will suddenly die out on you once they are done but they will give you the same consistent power until its last breathe. Who these are for: -People who have devices/uses that require very consistent power. -People using devices that are subjected to more extreme temperatures. -Expensive devices that could be destroyed by a small battery leak. -People who like to store up on back-up batteries for a long time for later use. Who these are NOT for: -People who think 10 year shelf-life is the same as 10 year use-life. -People looking for rechargeable batteries (these are NOT the same as rechargable lithium batteries) *NOTE: These are very close to the size of your average alkaline battery but ever so slightly bigger since the edges are not rounded so if you want to put these into something where the battery space is a very tight fit it might not fit.

Good Batteries

I have so many smoke detectors in my house that I really don't want to change the batteries so often. So I decided to pick these up as they're supposed to last as long as the detectors do (~10 years). They seem to work very well and I had no complaints. Yes, they're a bit expensive, but they're very easy to put in the smoke detectors and overall I have no complaints. 10/10 would buy again.

These cost quite a bit more than standard alkaline 9V batteries, but I think they are worth it for nicer or more important devices. They are lightweight, have a long shelf life, and tend to last much longer than regular batteries. I use them in devices where I want dependable power and do not want to worry about frequent battery changes or leakage damaging expensive equipment. I would not use them for every basic household item because of the price. For higher-end electronics, alarms, meters, or equipment that may sit for long periods, the added cost makes sense. They are expensive, but the reliability and longer life make them worth buying for the right applications.

These are fantastic for anything where you don't want to change batteries often

Several of my smoke detectors started to beep indicating the need to replace batteries. Most of them are accessible with a small step ladder but the one in the master bedroom is about 12 feet high. I proactively replaced that one with this lithium battery when I had a painter at the house for something else. The last thing I want to do is be woken up by a beeping battery on a 12 ft ceiling and try get out a ladder and attempt to replace it. It’s too soon to know how long these will last but they should be an improvement over alkaline batteries. Energizer is a brand I trust so it’s worth the money for me vs a less expensive generic. I plan on replacing it in 2 years just to avoid the uncertainty. It was compatible with my smoke detector and fits like a regular 9 volt battery would.

Yes, I rated these as 5 stars in hope that more folks might read this review. Who knows if that logic will work but in actuality if I could rate this product ZERO I would! I replaced 12 smoke detectors in my home in December 2017 because they were 13 years old and I learned that they have a 10 year useful life...I know I wondered too but I bought into it to be safe. Because a few of these babies are 16-18 feet in the air, I was excited to find long lasting 10 year batteries for my detectors. After all, I hate standing on a ladder that high in the air changing out batteries once per year after one of the batteries loses enough juice to cause that obnoxious chirping at 2 or 3 in the morning...why is this always the case? NEWS FLASH!!! After 14 months, my investment in these 10 year batteries went right down the drain...at 3 in the morning no less! What a joke! After paying more-than 10 times the cost of decent alkaline 9V batteries, these things had no more useful life. They also just barely fit into the detectors and some folks have noted they don't fit in their model(s) at all. Do yourself a favor...DON'T WASTE YOUR MONEY!!!

Entrega aa tiempo y excelente rendimiento de las baterias

A few things here: Shelf life means SHELF LIFE not how long the battery will work in a device. My experience with lithium batteries whether AAA, AA or 9v is they do last longer than standard alkaline batteries...how much longer depends on what they are installed in. These 9V batteries have right angle edges, not the rounded edges that are found on 9V alkaline batteries. This makes these batteries slightly larger than an alkaline 9V so they may not fit in the device you want to use them in. These fit fine in my smoke detectors but will not fit in the outdoor entry pad on my garage door. There are two real advantages I see in lithium batteries....AAA AA or 9V. Lithium do not leak like regular alkaline batteries do in a device or while in storage. I got tired of the damage caused to devices from leaking alkaline batteries and I’ve never had a lithium battery leak. If you need to use batteries in a cold environment lithium function to -40C whereas alkaline batteries stop functioning around -18C. Lithium batteries are definitely pricier than alkaline....especially 9V. That said for the piece of mind of not dealing with damaged devices from leaking alkaline batteries and the fact they work at much lower temperatures (weather stations, flashlights) they are worth the extra cost.

Among the best. Long lasting and no issues.

If you need batteries, personally, I feel these are the best. They last a very long time. Good quality cost a little more but you get what you pay for.

Bought for backup for two wired in smoke alarms with ten year expiry matching the shelf life of the batteries. I’ll check back in ten years and let you know if they did the job!