Looking for a good external bms for my stock onewheel xr batery

looking for an external bms to balance my stock onewheel xr battery. I’m new to this and am trying to get everything together for my build. any help and tips would be great.

this doesn’t really exist afaik - except for this one here but I don’t know anybody who’s tried it:
24S 25A 1500W LiPo/LiFe/LiTo Battery Charger (chargerystore.com)