LP Rechargeable 9V Lithium Batteries - 600mAh Long Lasting LI-ion Batteries with Micro USB Charging Station - 4-Pack 9 Volt Batteries

I love these things! 9V batteries always feel like a hassle—either they drain too quickly or sit around too long and die before you use them. These rechargeable ones completely fix that issue. I use them in my smoke detector, carbon monoxide detector, and car remotes, and they work great. They charge fast, have a handy LED indicator to show charging progress, and best of all, they charge via USB—how cool is that?! No more wasting money on disposables. Highly recommend! Nice little case, actually reused for something else and kept it.

The return window closed June 1, 2023. I received 2 rechargeable 9 volt batteries. About 2 weeks after they became nonreturnable one of them stopped working, would not hold a charge. I rated this item lower. While I like the Micro USB charging and the cable that came with the batteries, I ended up paying for one battery that actually works and that defeats the purpose I had of always have a battery ready to use. TO THE CREDIT OF THE COMPANY, I have revised my rating now on July 10 2023, after they have offered a refund.

I’m a guitarist, and I live and die by 9 volt batteries, especially for my acoustic guitars. Which, I have about 7 that I rotate through with on-board electric that require 9v batteries. These are outstanding, and work for longer than I expected, charge quickly, and for the price, I was impressed. I’m really pleased with this product. I’m sold, and am planning to buy another set for when the batteries I haven’t changed yet run out.

Bought this a few months ago, used them several times, and they haven’t failed me yet. Although I’ve noticed the slight degrade on the the charge time. But still works. I use them for my wireless mics. I’m a dj and my mics are on for about 5-6 hours. Last weeks gig was the first gig that I had to replace the battery in the middle of a gig. Luckily I have a spare. Lol.I will try to discharge them completely and recharge to full. Hopefully that works.

9 V lithium rechargeable batteries Great value for a highly rated battery

The product is good. No doubt about it. However, I just wanted Lithium Batteries. I have a charger. That is why I returned it.

My son got me 8 moisture sensors and rechargeable 9v batteries to operate them. I thought great, and ordered another 12 9v batteries for my 11 smoke alarms (5 bedrooms, 2 furnaces, 1 on each level, 1 in utility room, if you're counting.) I charged them all up, a little bit longer than required, and replaced the smoke alarm batteries. 5 of the 11 weren't powerful enough to convince the smoke alarm that it was charged, so those smoke alarms started beeping: "battery weak." I know smoke alarms die out over time, but I also write down the date I change the unit itself,--some were very recent--and none of these units had started beeping before I switched batteries.It's no fun to put in a new battery and to hear lots of alarm beeping--"not enough power here!", plus it's unnerving to hear beeps going on in your house! Using these rechargeable batteries clearly showed me 5 of the 11 (45%) don't have the oomph to tell a smoke alarm that it's adequately powered up, on day one. I replaced each of these 5 beeping rechargeable batteries with the nearly-2 year old 9v regular batteries I had just pulled out, and the beeping stopped. So, I can't count on these rechargeables being good for smoke alarms for the duration, let alone for a few hours on day one, and I'm gonna replace all of them with the nonrechargeable type. Forget about buying these for your smoke alarms. it was a waste of money for me.

I use 9V’s in several of my electronic tools and this saves me from spending a bunch on new batteries. Plus the capacity is more so they last longer