The ZBMS is good, very simple, and relatively inexpensive compared to the ENNOID XLITE. The ENNOID is fully featured, and very good functionally, but pretty fragile both physically and electrically. I have a box of dead ones. Kevin is very good at sending replacements, but implementing it takes real forethought and careful assembly of the battery box.
The ZBMS has proven fairly difficult to actually break. And I think depending on the riding sensibilities of the user, that’s important.
Either fits in the XR box. The ZBMS more easily.
For more qualification of my above post, I have a battery of mine sent back from a customer. It was the 20s2p, and it was used with VnR (I’m unsure exactly how, but doing so fried his first BMS), and then used without a BMS for what I was told was 2 weeks.
The battery is now condemned, on my bench for discharge and recycling.
It came back with 1 parallel group at 0.0v, and the rest at 4.3/4.35v. Had it been charged to 84v several more times with no charge monitoring, it would have gotten increasingly dangerous.
Coupled that with whatever electrical damage caused the p group to drop to flat dead, and under load, that group may have been pulled into negative voltage / reverse polarity. Which isn’t ideal.
Not every BMS can guard against every failure, but to choose to not install one is simply a bad idea.
There’s a good discussion in the battery builder’s club thread, where @Flyboy said the following: