USB CR2 Lithium ion Rechargeable Battery, High Capacity 3.7V 300mAh Rechargeable RCR2 CR15H270 15270 Battery, 1.5 H Fast Charge, 1200 Cycle with Type C Port Cable, Constant Output,4-Pack

They are great and work perfectly. I use them in my Xbox series x controller. A full charge lasts about 3 days of gaming. I recommend them. ***(Edit)***. The batteries will no longer hold a charge for more than a few hours in my Series X controller. Just letting you know that they do not hold up for more than a few months…

Yeah, battery life might be a lil reduced compared to a Duracell but...they're like $15, and you never gotta buy alkalines again. Worked in absolutely everything I've tried so far, just bought a second set. Really can't complain.

Just started charging these and one is dead on arrival and wont take a charge. Two are charging and I'll test the 4th one in a little bit. I got these for a computer mouse and wanted two sets of two so I could swap them without waiting for a recharge. I'll try their customer service and see what happens, I have one day left on my Amazon return.**Update. I contacted custom support after my return date had passed on Amazon. Their customer support sent me a replacement set of two for my one dead battery. Both the replacements work just fine. These batteries do put out the full 1.5v but their mAh are less than traditional AA batteries so they may not last as long the traditional batteries in things like xbox controllers or other continuous transmit devices. However I bought these for TV remote controls and wireless mouse/keyboard where they work just fine. And once they run down just recharge them and your good to go again. Lithium Batteries can be recharged about 3 times more than NiCad batteries so over their life time you should get more use of out of these compared to traditional one use or NiCad batteries.

Review Update July 15, 2023I give up. alkaline batteries will last a year. These only last about two months. I'm tired of the slow dimming of the motion detection light and having to charge these. I'm tossing them into the circular file and switching back to aliakline batteries for this application.Review Update April 14, 2023These batteries are lasting about two months where alkaline batteries last over a year. This is very poor peformance, especially considering how much I paid for them.Review Update Nov 21, 2022As I said in my main review I installed these 4 batteries in an overhead motion detection light in our garage. Alkaline batteries tend to last about a year in that light. These lasted about 3 months before the light wouldn't turn on. So they seem to have far less capacity than the Alkaline batteries. I won't be buying this type of battery again.At this point I can't recommend these batteries.Initial Review Aug 31, 2022Why did I buy 4 of these batteries?We use virtually only rechargeable batteries in our house. We have over 200 AA and AAA eneloop type batteries in use for multiple camera flash units (Speedlights} several toys, audio equipment, etc. They have served us well. In over 7 years of use I've only had two batteries fail. Every electronic device that takes AA or AAA batteries can be powered by the batteries we have, all but one device that is.One device is an overhead battery powered motion detecting 8 inch light. It takes four C cell batteries and will not work with the lower voltage (1.2V-1.3V) eneloop type batteries. The user manual for that light specifically states that 1.5V batteries must be used. And it's true. The light simply won't function at all with eneloop batteries. So I've been powering this light (actually we have three of this type of ceiling light) with Energizer batteries. They aren't too expensive and the lights are efficient so the batteries last a minimum of 6 months. Still I hate throwing away or recycling alkaline batteries. We've had such good performance from eneloop type batteries that I was willing to take a chance and ordered these.The test...I fully charged all four of these C2 batteries before installing them in one of our ceiling lights. The good news is the light does work with these 1.5V batteries. However there is a noticeable delay between the time we cause a motion and the light comes on. It's not a long delay, more like 2 seconds. But we count on these motion detection lights to come on as we step into the garage. Until one of the three lights comes on it is pitch black in the garage so we do notice that delay.The alkaline batteries that we had in the light had been in that unit for almost a year and were still working but slightly dim. The C2 batteries were a bit brighter but not up to the full brightness of fresh alkaline batteries.I did a check of the batteries using one of those flexible strips that come with new batteries. The year old alkaline were holding slightly less power than the C2 batteries.I put one of these C2 batteries in my battery charger only to have it report voltage and current of the C2 battery but my charger behaved as if the C2 battery was faulty. I wasn't attempting to charge it but just wanted to gather some data. I really would like to be able to charge the C2 battery in my charger which can recharge up to 8 batteries at a time. I find the dual USB-C cables are not like the rest of the batteries in our house so they are a bit awkward.For my money this will be the last set of this type of lithium batteries that I'll buy.Pros:- Can power devices that demand 1.5V- The USB-C small split cable that comes in the box with the batteries coupled with the lighter weight of the lithium batteries may be beneficial for travel.- Fast charge times may be helpful but we don't complain about eneloop type battery charge times.Cons:- It seems alkaline batteries hold about 3X more power than these C2- These batteries are 3-4X higher cost than alkaline batteries. It may take a long time and a lot of use to regain the extra cost.- Can't charge in standard battery chargers.I'm sure there was a lot of engineering that went into designing these batteries but we can't find a practical use for them in our house.At this point I can't recommend these batteries.

I have looked for a product like this for YEARS now and I am glad it finally exists. I ordered this and waited weeks for it to arrive. I am only using one of the batteries but I have an "every day carry" flashlight that uses a single one of these batteries and this works perfectly. My original battery was worn out and my replacement batteries need a physical charger (can't be charged on battery) but this is the best of both worlds. Way more capacity than the original battery and USB-C charging!Time will tell how they last and I will report back if they fail but right now I am super happy!

I got these batteries because I have an automatic door and noticed that alkaline batteries worked better and provided more torque to the door lock than regular rechargeable batteries. So I’ve decided to get these that have a constant 1.5V output like the alkaline batteries. These have 2600mWh which comes out to 1800mah. It easily last me a month then I charge them back up, I don’t want it to just die on me one day and not be able to go into my house. But I have noticed that it does give you somewhat of a warning, you can tell when they are running low when I hear that it isn’t as strong as it’s suppose to be, for me..once I notice that the lock is being a bit sluggish like if it’s on regular rechargeable batteries, that’s my cue to charge them up. These batteries are great for any device that needs good constant voltage and current. My door locks and unlocks faster like if there is alkaline batteries. Please note that some of the bad reviews were written when version 1 of these batteries were up, but now this new version with more mwh, 2600mwh AA, is way better than the previous model. Will update this review if something happens but as of right now, they are amazing! Just wish the price was a bit better, or if they offered an 8 Pack at a discounted price.

I liked the idea of not having to use my big wall charger like I do with my other batteries, but these don't hold a charge for too long.I use them for an apple mouse and keyboard and I find that I have to recharge them every couple of days. My other batteries for comparison can go a week or two without a recharge in same use case.I bought these to cut down on my travel kit So for that reason they work fine.