Sep 3, 2017 · Nice build, nice post. I too am doing an experimental battery pack build withView attachment 19090 Cheap 18650 Li Mn batteries, Ya I bought some cheap 18650 Li Mn batteries on E-bay. Lot of 100 high drain 35 Amp 2500 mah for $60, Just as experiment to build a battery pack and to try out my Sunkko 709A spot welder, How could I go wrong?

Feb 27, 2020 · Let's assume you have a battery pack in a Reention SF2 case, charging a 36V 350W Bafang G070.350.D hub motor. The battery pack provides 36V 24.5Ah with LG 18650 3500mah cells arranged at 10S 7P. With pure nickel sheet connections, insulated cell …

Jan 1, 2022 · As a battery scientist, it is my responsibility to make people aware of the safety implications. There are huge safety risks when you have untested packs. You don't notice it right away but when it happens, it is usually petty bad. When you run 5V cellphone battery vs a 50+V E-bike battery, appropriate caution needs to be exercised. @George S.

Sep 16, 2016 · In general, 18650 based batteries put one cell in parallel with others to make a nominal 4.1 volt group. Then they connect as many groups in series as needed. Let's say you have 4 cells in parallel. That's 4P. Next,, if you put 10 …

Dec 21, 2020 · Yes the first 10s2p pack had new 18650, 2200mah, 3.6v cells. The reconfigured pack has 2.5 years old 18650, 2400mah, 3.6v from the battery pack which came with the e-Bike. My original battery pack had a failed BMS, and the cells were glued and spot welded, initially I didn't have the tools to desolder them, hence set out to build a new battery ...

Mar 14, 2019 · Ok so lets say im building a 20s 20p battery pack. Each cell is capable of 30A discharge max. And so i connect the entire pack using the proper nickel strip size to handle the 30A. Now its all done and typically what you would do is solder your positive and negative discharge cables to positive and negative main of the battery...

Jun 23, 2024 · I am puzzled though by their 48V7,5AH Dolphin pack perk. If I got my numbers right, the 36V pack has 60 cells in a 12x5 and the 48V pack has 80 cells in a 16x5. I recently put together a 48V12Ah Dplphin battery using a commercial case and the same Samsung 30Q cells mentioned above.

Feb 22, 2020 · can I change the 18650 cells to make the battery work like new with the old bms or bms only works 18650 with which is assembled at the factory.? I heard that holding the button with the led light resets bms, in what cases is it used?

Jun 26, 2020 · I have 3 Hailong (shark) type 21700 cell batteries. I needed a new battery to replace an 18650 3.5A cell battery a few years ago and was thinking the 21700 cells were worth tracking down and sourced one from China via some googling. It is a 52v but have since gone to 48v because there really isn’t much performance gain as far as I can tell.

Feb 16, 2017 · I used to wonder about that myself, however, I learned recently that with the 18650 battery cells glued together, they actually function as a sort of heatsink in that they radiate heat outward as a single unit, whereas using pack stencils, there is a ~1mm air gap between each cell that actually serves to reduce the ability of the pack to get rid of heat effectively.