How do you connect a BMS to a battery pack?

Connecting the BMS: B- Terminal: Connect to the main negative (-) terminal of the battery pack. B+ Terminal: Often already connected internally; check your BMS specifications. B1 (or B0): Connect to the most negative point (first cell's negative terminal). B2, B3,: Connect sequentially to the positive terminals of each cell in series.

Does a BMS need to supply 1C?

There is no rule that says a BMS must supply 1C, the BMS need only be sized for the load not the cells C rating. Yes different size cells have different internal resistance, this is how the current get distributed proportionally!

How many wires are in a BMS battery?

In the old battery from the BMS there are 3 white wire soldered connectors, one red wire soldered connection, and one black soldered wire connection. I assume this means whatever cells inside the casing are wired to be 4 battery units/groups in series?

How do I use a BMS to handle a load?

Maybe use Will's trick of using a small cheap BMS to operate a relay to handle the load. Use heavy cable to parallel the main positive and negative buss bars and run through the contactor to the load. Use 3 more cables, of about #8 awg or so to jump together the matching 3 bolt buss bars to force the cells to stay in balance from pack to pack.

What voltage should a new BMS have?

Just John pointed out your old BMS says 3.65 and 2.5 volts (everything else is Chinese) so those are the max and min voltage settings you want your new BMS to have. Whether it comes pre-set or is programmable I don't know; someone who has used the recommended BMS can tell you.

Do I need A BMS or a PCM?

The BMS plays a critical role in managing and protecting your battery pack. However, if you're unsure whether you need a full BMS or if a simpler PCM (Protection Circuit Module) would suffice, you can learn more in the article about the differences between BMS and PCM. Identify BMS Connections: