Small Bestech BMSs!

Also, another question, is the AMP rating you get with most BMS’ discharge capability for each cell/ ‘s’ or the whole output overall?

@Jinra did you have to order two from them or do they allow only one? I recall they put their lowest limit on 2 products but not sure.

EDIT: I did notice they are adjustable aswell as there seem to be different variants of the BMS with different overcharge voltages. Maybe you got the wrong one or voltage is just set low?

Yea you have to order at least 2. They sent me a datasheet with each BMS which overcharge voltage was listed as 4.25v. No cells go over 4.06~v though

Allright! may be worth it eventhough I have to order 2, Currently running without bms and have no problem but would be a nice thing to have.

Also lacking space so the size of them really appeals!

FOLLOWUP:

Turns out you actually need to solder on B- on the BMS. I thought the B- from the balance lead would be sufficient, but apparently not. My pack now charges to 42v with a ~.7v cell deviation at the highest.

Yes, for bypassing (not recommended) you still need to connect the battery’s negative main to B- But you don’t use the P- except for negative charge wire unless the bms has a separate pad for charge C- in which case you don’t use the P- at all

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Yes, i just thought I’d be fine with balance negative since my other bms worked perfectly fine without it.

I’ll definitely find a use for the one i got (80A discharge so big w/ heatsink), but would like small if i’m going to build into a thin board…

For the folks who know - is there a supower 12s that’s also small and bypass? Or is bestech the way to go?

Would this be the correct way of bypassing BMS during discharge then?

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looks good to me

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So, what about this for an 8s setup with balance charging only and VESC discharging?

If 10 amps is the amount of current you want to draw from the battery then yeah that should be fine, that would mean your motors will be getting 10 amps max, on 8s that’s only 296 watts of power… being such a low current though you’re not going to have any trouble with over heating I’m pretty sure

I have the same battery configuration and same cell. I have been using a 8s battery support 60 amp bms.

However ordered some new cells for a 12s pack cause 8s is enough for me!!!

Good luck with your pack!

Hi, I am looking for a small BMS just for charging…I have found this one on ebay, is it okay? Does anyone have experience with it?

I am quite limited by space, because I will be using split enclosures and I dont know how to charge…I dont want to remove the enclosures everytime to charge like I did so far…should I bypass small BMS, buy normal one and use it even for charging (I would have to lead balance wires under the grip tape to the enclosure with VESC) or find some multi pin connector and use BMS outside the board (12 pin would be enough in case of 10S, 1 pin would be empty)

Any advice is welcome :slight_smile:

that bms doesn’t balance. why not use one of the bms’s mentioned in this thread?

@jinra I thought it is bigger :open_mouth: Ok ,t will go with it :smiley: sorry about that :smiley:

How can I order from them? do I have to write an email or is there any store? EDIT: I found it, it was posted few replies abouve this one :smiley:

Which do u recommend more and are the switches working?

@Jinra

How are theese bms holding up? Tried both or the one u initially installed works fine still?

Figured I may aswell try and get some space now that winter is coming and I aint riding :frowning:

I’m using the red one, great so far on two different packs!

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i am so confused. I either want to do 2 5s, or 2 4s, in series, so can someone tell me what is a good bms, charging port, charger, and how to wire all the stuff. Sorry for asking noob questions