I've been researching bafang for awhile and read as much as I can. It seems the bbs01b and bbs02b information I am finding is older and mostly about the bbshd now. I keep racking my brain trying to decide which one to go with. I've been leaning towards the bbs01b 36v 250 watt because I already have dewalt 20v tools and was thinking of using them for a 40v battery and getting some spares later on. I'm on a bit of a budget also but don't want to throw good money away either. I could do the bbshd and use my batteries for 60v which is close to the cut off high voltage or I've been looking at ego 56v batteries.

What I am converting is a a cheaper mountain bike that has nice road tires on it and has served me well over the last year. I mostly ride my trek road bike but I am wanting the ebike for getting groceries, etc. from town which is 32ish miles round trip at a minimum. I plan to do most of the cycling but if I just had some assist on a few hills along the way or if I have a head wind it would make it much more enjoyable. I guess before I spend the money I'm doing a sanity check on the following:

BBS01B 36V 250 watt with a C961 display ( I don't need anything real fancy?) $403.99 + $10 shipping
2 - battery adapters for dewalt 20v - $30-40
spanner wrench - $18

probably misc. wiring, etc. but am I being too cheap? Also I already have the bottom bracket disassembled and verified its the correct size.