2 Pack 18650 Rechargeable Battery Lithium 3.7V 3300mAh Button Top, Batteries for Flashlight, Camera, Small Fan, Outdoor Garden Lights

I decided to try these for flashlight use since the previous vendor I use doesn't seem to exist anymore (those batteries have served me well since 2018).First off, beware of any vendor with ridiculous capacity claims. Also there are lots of horror stories of subpar rechargeable batteries when purchased on line.These batteries have a claimed capacity of 3300 mAh. After complete charge (they arrive at around 50% charged, ideal state of charge for storage) the were all in the 3100 to 3200 mAh range and stayed cool during charging. After a few charging cycles I'm sure they'll be up around the 3300 mAh range.I definitely recommend these.

I have used so many different rechargeable batteries that just do not perform as described. There are many that over state the mAh's and do not last over 20 recharges until they start going weak in 15 minutes. These have surpassed my expectation's as I have never bought this brand before, but to my surprise these work GREAT. I waited until I used these for several weeks and they still are holding the charge when using them for a long time close to 1 hour on MAX Power on my headlamp set which to me is incredible. The one thing you have to get used to is the recharge time. They take longer than those Cheap-O's but that is to be expected on a True Quality Product. I will buy more as needed That's A Fact Jack...

Put two of these in my UConsole from ClockworkPi, took literally 20hrs to charge that device. Since that is run in parallel means that the capacity is doubled, to a theoretical 6600mAh, and with mafs, I was in between 6000 and 6600mAh range meaning honest enough. Apparently you can go inside of Linux and boost the charging current, otherwise it defaults to 500mAh. WHICH IS WAY TOO SLOW. This definitely does the job and is honest enough about its capacity, that I can recommend them.ADVICE/WARNINGWhen shopping for these, anything claiming 3500mAH or more capacity is a lie, even with the newest and greatest improvement now JUST HITTING the market Lithium Silicone Graphene, the theoretical max capacity with that tech is about 5000mAh. You're paying more with these, since it's closer to honesty.

I tested these on my VC4SL and found them to have capacities in a range from 2988mAh to 3133mAh. I measured the capacity of 8 of these batteries, the mean(average) capacity was 3021mAh. This isn’t bad but it’s not the 3300mAh they claim, the highest was 3133mAh. These batteries are button top and have a protection circuit. They have pretty high internal resistance averaging 70 or so milli-ohms. I tested the max amp draw for these to be around 8-10amps continuous. They have an ok voltage discharge curve, they don’t see any issues till after 50% discharge where the drop off becomes somewhat steep.All that aside, they are fairly inexpensive and arrived very quickly. They work well enough for most applications, but suffer V-droop in the cold. Battery life is good, but not as advertised. They seem to be reasonably durable, not sure how long they will maintain their performance as only time will tell.

Works great in my vape rig

I had a bad experience with another battery type I bought to replace a 2500 mah battery I had in a MIDI controller. So, when I bought this pack of 4 batteries, I ran a test on them for capacity. They came up a little short.The batteries are rated for 3300 mah on the battery and in the Amazon advertisements. Testing the batteries on a tester, they came to an average of 3048 mah, with a minimum of 3010 mah and a maximum of 3100 mah. Running the same test on my 2500 mah battery gave me a capacity of 2596 mah.

The capacity is as advertised.

Batteries function as advertised. I purchased them as a replacement for my Ring OEM batteries which are not very durable.JESSPOW batteries charge and work well but I need to add a small shim since they are a tiny bit short for Ring device (Pathlight).What I don't understand is why Ring does not make replacement batteries readily available.