How to use 2 Hymotion 24V LiFePO4 battery packs on an ebike?

I have two of the Hymotion LiFePO4 24V packs as shown in the attached photos and a cheap 24V BMS that I got from Ebay. Even though I've tested the voltages from the various terminals adding up to 24v, I'm not clear on how to wire this whole project up and what the two black plugs are for.

I'm interested in using these Hymotion batteries on a folding 3 wheel e-bike conversion. I think around 10mph is enough speed for me but I would like to be able to climb moderate hills while carrying groceries, etc.

I have only done one e-bike conversion before using a 1000W 48V rear wheel drive motor using an E-GO lawnmower battery that has its own charger and built in BMS. It seems to be working ok though I've only started riding it recently so I don't yet know how it will do on reliability.

Any suggestions or ideas on good ways to set these up with either two separate BMSs or one would be greatly appreciated!