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(Dead thread, but suggestions might help future ppl)
My suggestion to anyone when picking a BMS...stick to "Two wire" BMS's unless you have a specific reason to want a separate charge line.
Two wire will behave like you're connecting directly to the battery...nothing weird screwing things up, unless you trigger the protection...
So if you're replacing a lead acid battery on, say, an e-bike, your regen will still work and not try and fry your BMS or behave like there's a diode blocking the regen. Or in a car, where the altenator is going to kick in at some point. Or anything else...
I really can't see much point to a three-wire, unless it's in a device which will only ever drain it and you need to be able to hook a charger up...but why you couldn't have it hooked up in parallel with the load/battery...I have no idea. Protection from dummies short-circuiting the charge port comes to mind, but I couldn't guarantee it wouldn't short out that way anyway.
Stick to two wire. Especially if you're not sure.
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