48v 6.4ah 307.84wh Battery with Panasonic Cells - $64/kWh
This is the best deal on 48v modules that test like new. Just $20.
These are absolute BEAST power modules with Panasonic cells inside. 48.1v 6.4ah 307.84wh. Built for power but at this price you will not find a better deal on batteries that have either never cycled or only cycled a few times. Perfect for solar storage as well. These modules have 52 cells inside. They are rated for 307.81wh and every module we tested has tested around that capacity. The test of the module is in the 3rd photo. Since these were used as backup only they likely have never been cycled. The cells are power cells, Sanyo UR18650WX 1600mah cells manufactured by Panasonic which are 25a rated power cells. This module can push 100a and had a 150a in-line fuse on it (not included). It is just built so well and it is also easy to work with. The circuit board has balancing but the board is not a BMS, it is a BMU which communicates to a main unit so you will have to add your own BMS.
The 2nd photo shows the easy BMS wiring schematic. The copper piece connecting B- to C- will already be removed for you. BL stands for balance leads. BL- is the main negative balance lead. Usually the main negative balance lead wire of a BMS is white or black color. BL1 would be the 1st balance lead after the negative balance lead. All the way up to 13. So a 13s BMS will have 14 balance leads. One for the main negative and 1 for each of the cells in series positive connection. There are large solder balls on the connections already for the balance leads so you only need to use a soldering iron to heat that solder up, place the balance lead wire in the solder, then remove and let it cool. It takes seconds to connect the balance lead wires this way. The main B- and C- connect easily, just add a ring terminal and bolt those wires down. The main positive and negative connections can simply be bolted down with ring terminals as well.
The battery module is 8 lbs.
The bolts that fit the main connections (not included) are M6-1.0 for the negative side and M5x0.8 for the positive side. Recommend 1/2" length. You can find them everywhere, they are very common bolts.
Module size with handle is approximately 13" x 6" x 2.25"
Nominal voltage - 46.8v (3.6v per cell)
Fully charged voltage - 54.6v (4.2v per cell)
Fully discharged voltage - 36.4v (2.8v per cell)
Max continuous charge - 5a (1.25a per cell)
Max continuous discharge - 100a (25a per cell)
These modules are built to the highest standards and you will be able to see first hand what a top notch battery assembly looks like. The balance board even has fused series connections to prevent a possible short caused by the board.