Let's do some learning! Also, Amazon link for you at the end: It's not a normal battery as far as balance chargers go, assuming you tried with an RC hobbyist charger? The BMS inside the battery IS the charger, you just need a power supply to feed it. I haven't seen it mentioned here, and you should probably check the item description or manual, but xt60 is ubiquitous in the ebike world for speed controllers, I imagine the deans is for charging. I could be wrong there, check your documentation. This is almost certainly not 100,000 mah (100Ah). They are probably playing fast and loose and going for a weird cell total Ah number. I am assuming 13s5p? Hard to tell from just a picture with no measurements... If we assume 18650's, 13x5=65 cells total, 100Ah/65 cells = 1.538 Ah/cell (1538 mAh) which is WAY more realistic. Assuming THAT, we get a more realistic capacity of 7690 mAh (7.69 Ah, 1538x5) and a max voltage of 54.6 (4.2x13) for a total energy of ~420 Wh (nice). You'll want a "48v lithium charger" which is actually 48v nominal, the label should state 54.6 v output, again this is just a fancy power supply. As for amperage, that depends on the cell, but you'll be safe at 1/2 Ah of the pack, so ~3A or less should be gtg. Again, not sure which plug, could be either or it could be just one. Here's an Amazon list in that should work (you will need to change the plug): https://amzn.to/4xpzm7C
