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Do you absolutely need a relay or you can wire the heater pad (that has the right amperage and voltage ratting) DIRECTLY to the JK without a relay? I think I am reading that I do not need one

Limitation in my opinion... you should be able to configure the MP50 like the shunt. (Just saying) Thanks all for your input. I'm goint to make a USB charger with my extra cell since I am 3s now..... photos to come.

Hmmm interesting.... I never saw it that way.... 3s makes sence. For whatever reason I always though you needed to go in pairs

They are 25 AH... I got a deal from a friend but only for my 4 and I can get two more if I want them and I pick them up locally ... no extra shipping. Standard price is 40$ canadian per cel + shipping. Here is the link...

I am currently processing the same type of cells. They are version A however and most likely more used than your. I will also be capacity and resistance testing everyone of the them. I am shooting for a 128P8S setup. What is your strategy for spot welding them together? How about the fuses...

Where did you get the battery holders from ? I have been looking at some bulk deals on Aliexpress but they seem expensive still... About 200$ CAD (140 USD) for 2000 holders that support 1000 cells. I have been looking at spring battery holders instead... The cost will be much more (650 $ for...

Is this what you are referencing... https://www.amazon.ca/gp/product/B01BMRBTH2/ref=ox_sc_act_title_1?smid=AM0JQO74J587C&psc=1

If I have 3S ... I would be charging the battery to 100% pretty much all the time to get to 12.6V If I go 4S I would be charging the battery to only 85% to get to 14 volts. Wouldn't I prolong the life of my battery pack by going 4S and using the MT50 configuration to limit the voltage of my...

Agreed... that is what I am seing also.... about 100 watts of heating per day