C

I can’t believe I’ve been using my batteries for over 4 years on a regular basis in a fan. They take a little longer to charge now. These would probably be equivalent to an EV with 200,000 miles on it.

A high-performance solution that exceeds expectations, delivering exceptional results with remarkable efficiency and precision.

Used in Marathon Backlit Wall Clock. Original Alkaline batteries lasted 5 months. Ni-Mh batteries at first lasted 2 1/2 months, but recharged batteries only lasted a week. The Lit-Ion batteries are as bright allowing the clock to be read at night. The only problem I had with these batteries is that it uses 2 USB-c connectors that fit loose. The connectors would come out when placing them on the other. They had to be wiggled to allow charging and had to be positioned at an angle to put weight on the connectors to charge.

So far so good. I use these in a camping flashlight. I can recharge them from my truck or self-made solar generator. They have a little light on top that tells you when its charging and charged. Quality seems to be good so far. Best value I could find at the time. I will buy again when needed.

Review Update July 15, 2023 I 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, 2023 These 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, 2022 As 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, 2022 Why 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’ve bought LOTS of batteries for TOO MANY flashlights (e.g., Yellow Diamond at Olight ~;-) Smartools outperforms all but the most expensive batteries available (which barely edge them out by not shutting down at a low enough voltage), and I use the 1.5V AA and especially these 3.7V AAA to combine with their latest EDC flashlight, the i3T 2 eos, which can operate on 1.5V buUut… is designed to run insanely bright on these 3.7V lithium ion batteries. And, oh, man… they sure do. This makes for the ideal gift to pass out, being that I can give folks the one from my pocket (since I always have several lights on me at any given time).

So beneficial! The charge last a long time depending on what you use these for. I’m using them for baby stuff like toys and rockers with sound and they last all day / a few days with heavy use.

They work well when freshly charged but they have poor shelf life and are fragile, often fail after dropped a couple feet onto wood floor.

Loved these. Comes with a dual cable making it possible to charge both batteries at the same time.

Son muy prácticas y duraderas en lo que respecta a su uso en el día a día, yo las ocupo en el campo de golf para el medidor de distancias láser, el cargador tipo de C de carga rápida es muy bueno y al venir 4 no tengo problemas de quedarme sin batería en mi láser.

Weird pluging into the side of the battery hut its a good idea.

The batteries are very pricey. I replaced some Duracell batteries with them. Where the former lasted 3 months, these lasted 3 weeks before having to recharge, which is not great.

Puse en el buscador pilar recargable tipo D y fue lo que apareció las pedí y son AA porque también no dice en la descripción el tamaño