Do you have space for a 6p battery? If so, buy a couple vruzend kits and make your own. You'll know exactly what you have and trouble shooting will be much less bullcrap. Forget the bms garbage and check the voltage of each parallel group once a week. https://www.18650batterystore.com/18650-Battery-p/lg-m29.htm in the US sells LG m29 for about $3 a piece for 50qty . If you only charge it to 32.8 volts (4.1v per cell) , you don't have to sweat too much about perfect balance. But unless you abuse the crap out of it, balance won't be an issue for a long time and when it does become an issue, order some balance leads and use a hobby charger to balance it in 2 sections. Take your time ensuring your connections are secure, and that it's encased and protected from touching metal and you will have a much much better battery than these premade chinese crap packs. Also consider a meanwell LED powersupply to charge it. An ELG-150-36a runs about $35 and has adjustable voltage and current.