7.2v 63.65ah 458.28wh - 38x 3.6v 3350mah 18650 Cells - $83/kWh
Each module is filled with 38x 3350mah Panasonic 18650 cells. Model NCR18650BF. This is one of the best 18650 cells ever made. For $38 you are getting 38x 3350mah cells for just $1 per cell. This is just $83/kWh.
Note: some packs will have the green NCR18650B Panasonic cells. Either way all cells are 3350mah.
Each cell can be discharged up to 2c continuous (6.7 amps).
Datasheets are in the photos.
Each module comes with a 2s BMS but that 2s BMS is only rated for around 2 amps. The connector is Molex 43645-0400. You can charge and discharge through the red and black wires. The BMS cuts off around 8.3v (4.15v per cell). We do not recommend putting the batteries in series with the BMS. If you want to build them into higher voltage modules just add an overall BMS. Also the nickel is very thin so either way, if you want to use these packs as is, we recommend to keep the amps limited to 5a with the current nickel. You can always spot weld nickel onto the packs to increase the amp ratings of the pack. Otherwise you can break down all the modules to cell level and rebuild them. If you want to build a 14s 48v 60ah module you can charge each module then series 7 modules with nickel then add a BMS.
We check the voltage of each pack to make sure all the cells you receive are good for reuse. All cells in every pack are good. Some packs will show 0v on the red and black wire because they are resting around 2.8v per cell. Those packs will charge when you charge them.
We tested dozens of packs as well on a full cycle test. Every pack we tested was right around 60ah out of 63.65ah. That's around 94% capacity. Of course, the BMS only allowed for 2a discharge so realistically on a 0.2C discharge test the cells should test around 90% of original capacity. Of course we cannot guarantee capacity of each cell but every single module we tested was right around the 60ah mark or 3160mah. When new these cells have a minimum capacity of 3200mah so really we're in the 98% range. These modules mostly have 2019 dates on them and since they can only charge and discharge at 2 amps they likely have only been cycled a few times. Perhaps never cycled. Also we only charged each cell to 4.15v on the test so if we charged them fully to 4.2v per cell these would have probably tested 100% capacity.
Pack weight is 4.1 lbs.
Dimensions are 7" x 3" x 2.75"
Note: it is likely if you break down to cell level some of the wrappers will rip from the glue. You can use kapton tape to cover the tears or we have 18650 shrink wrap in our accessories category for just 5 cents per wrapper.