i am making a 18650 battery pack with a configuration of 4x3cells for 12v. i am using these cells, https://liionwholesale.com/products/samsung-inr18650-25r-battery-genuine-tested-20a-2500mah-flat-top-wholesale-lot?variant=1038201992. i need to know what specifications i need for a BMS for this pack. I am new to this and i dont really know what i am doing when it comes to BMS, the most i will pull is 500w(41.6amp@12v) and the pack will be rated at 80amp continus output. so should i get a 80amp bms or a 50amp Also if any one thinks i am doing something wrong or thinks it is unsafe i would appreciate any feed back.