Help finding 14s 50.4v lifepo4 bms

[Sn4Pz]

@Rob

I don’t plan on charging up to 3.6v for time sake and piece of mind. so would like to find one with variable voltage cutoff, say, change it to 3.5 or even 3.4v

I can see why you want to do this, but based off what I’ve heard by other members who use these cells in their builds, the pack will sag to 3.3v per cell, and stay there until the pack is almost entirely discharged.

Here’s a discharge graph along with quotes from other members:

@deucesdown

I’m on A123. 3.3v nominal, 3.6v full. It actually drops to 3.3v under load pretty quickly, and kind of stays there.

@b264

LoL I use them all the time and have noticed how flat it is. I also like how they don’t really feel much sag at all. Or they sag a lot. Either way you look at it, what I’m saying is the sag is nearly constant throughout the entire discharge cycle so it feels like no sag at all.

(Click this one to read the thread, it makes more sense that way.)

Honestly I would just charge it normally. I think you won’t see much of a difference in time spent charging or riding. Not to mention these cells are already rated for a hella long lifetime, extending it probably makes too small of a change to notice.