question

The cost of the aditional copper to keep all 4 th same lemgth will be tiny in the greater scheme of things. However if the batteries have the BMS on-board it probably will not make any practical difference.

4 seperate circuits are going to be significantly easier to handle, due to the smaller wire size...

You may find a 'Lynx power in', just a bus essentally, with external fuses and isolators will work out cheaper, especially if you use NH style DC fuses which, with a handle, removes the need for isolators too.

If you are talking about 4 seperate banks of 4 cells with an external BMS then NO you cant without bridging all the cell-cell nodes although you could still use 4 seperate BMS modules.

You do mean LiFePo4 right? LiPo are essentally bombs!! Great for RC but folk keep then in metal boxes for a reason.

Keen to learn if I am missing something mind you...

Al

Yes, these are the Battle Born LiFePo4, so definitely the safer kind and have the onboard BMS.

if I’m reading your response correctly, it may be easier to wire each of the 4 batteries directly because I can use smaller size wires and fuses, and since the batteries have onboard BMS, even if the cables weren’t exactly the same length between each battery and the Lynx, it probably wouldn’t matter much. The difference would probably be less than a foot (or 300mm I think) between any of the 4.

the only downside I could think of at this point was future expansion of battery capacity since the Lynx has just the 4 terminal posts. So if I added a battery or two later, I might have to redo the whole wiring and go back to parallel wiring anyway with larger cable and same length wire between each battery and diagonal battery posts to the Lynx.