Description

54x 16350 650mAh 2.41Wh Lithium Polymer Cylindrical Battery Cells Elf Bar Vape Total Capacity for the entire lot is 130Wh, 35.1Ah @3.7V I’m pretty sure all of these came out of Elf Bars my brother and I purchased within the past year. Typically 2 charge cycles on each cell except the handful that had an additional cycle for random capacity testing. Degradation should be minimal and all the cells are good. I will have every cell discharged down to 3.60 to 3.65 volts for safe shipping. Expect there to be quite a bit of kapton tape used to safely insulate the tabs. The cells pictured are exactly the cells you will receive. I am tentatively planning on using that plastic case as well for shipping since it gives a pretty secure fit when full. These cells would likely fit very well in one of those very large DIY powerbanks that is made for 21 or 28 18650 cells. I have seen people standing vape cells vertically within those types of powerbanks and coming up with creative ways of wiring them up in parallel. If this is your intended application with these cells but you are not up to the task, I may be able to build the pack for you and install it in the powerbank shell. Please message me before purchasing this lot to discuss contracting me to build the pack for you. This is not a service I am offering for free. **My Personal Experience With Similar Soft Cylindrical Pouch Cells** I recovered about 20 (and used 14) 1450mAh cells from some larger vapes I used before I got hooked on Elf Bars. I made a 7S2P pack out of them and attached a 65W USB C PD/PPS module. At 65W output there was about a 3A load on the pack which would be about 1C. I had thoroughly tested a handful of the cells I did not use in the pack to determine what the max continuous discharge rating was. I did this based on voltage drop under load, temperature increase at the end of the discharge, and the amount of capacity I was able to get compared to their rated capacity. In my opinion a voltage drop of more than 0.5V from 4.20V, an increase in temperature at the end of discharge more than 30 degrees Celsius or an inability to pull 85% of its rated capacity are the numbers that should be used to determine a discharge current is too much for a cell. If any one of those three things happened I considered the previous 0.5A increment I had tested to be the limit. I started at 0.5A and worked my way up until I got to 5A at which point I was seeing all three conditions being very close to hitting my cutoff point or passing the cutoff point. I was able to repeat this in 4 cells with 4.5A being a discharge rate that seemed to be the safe continuous discharge rate which would be 3C. HOWEVER, these were not the same cells I am selling in this listing. DO NOT assume these cells can be safely discharged at 3C. Feel free to use some of my numbers in your testing but it never hurts to be more cautious and use more conservative numbers. My application was only a 1C discharge and I charged at no more than 0.5C. I suspect 3.0V might be the minimum safe voltage but I chose to never take them below 3.3V and only charged up 4.15V to leave a little bit of a safety gap. I have cycled that pack approximately 20 times but mostly at 20W output so a ~0.33C load. Charging lithium is often safe up to 1C but 0.5C is safe for every cell I have ever seen a datasheet for. My charging was done at 1A, again ~0.33C. I have not noticed any significant decrease in capacity, I recently discharged it and got the same mAh/Wh that I had when it was first assembled. I do not know what to expect from cycle life and the only real world similar application I have seen is vape cells being used to create powerbanks for Ukranian soldiers who reported after two months of use they were still working so take that for what it's worth. These numbers are provided just to give you an idea of what precautions you should take when dealing with cells that do not have a public datasheet available. Running them hard is a surefire way to be punished by Murphys Law for not treating lithium batteries with respect.