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.

  • \$\begingroup\$ Welcome to EE.SE. Questions about devices and where to buy them are off-topic as are delivery schedules so I suggest you delete those sections from your question or it might be closed. You might want to explain what you mean by "Balence" and "ballence" - maybe balance (small 'b')? Ask one good technical question and you will get help. \$\endgroup\$ – Transistor May 18 at 21:29
  • \$\begingroup\$ You must use a balancer with near max rated current and thermal sensing. Bad idea \$\endgroup\$ – Sunnyskyguy EE75 May 18 at 22:28
  • \$\begingroup\$ can i not use a BMS with balence then just use a DC input to the BMS or am i completely wrong \$\endgroup\$ – Henry Sullivan May 19 at 14:41

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