BMS?

Is a BMS required for both batteries if hooking a diy battery to the same parameters manufactured battery with a BMS?

Each individual LFP battery must have its own BMS.

Batteries connected in parallel or series do not need another BMS.

Mikendy said:

Is a BMS required for both batteries if hooking a diy battery to the same parameters manufactured battery with a BMS?

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You can avoid a second BMS by paralleling cells.

From experience, it sounds a lot easier than actually building it.

Cutting and tinning 9 extra busbars plus more fun. I recently turned 2 x 8s 25 ah packs tons to a single 2p8s 50 ah pack.