FOCBOX UNITY $299 | R-SPEC DRIVE KIT $588

Bms choise good or bad


#1

Wanted to know if anyone has brought this bms.

Would only be using for charging.


#2

checked it:
"6. Balance Charging - NO"
soooo don´t use it


#3

O that’s odd what’s the point in that then.

This one it must be then


#4

I use a bms which looks exactly like your first link, and it charges my 6s system perfectly. http://www.ebay.co.uk/itm/331881127371?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT here is the link to mine I’ve been using it for a couple of months now and it’s held up fine. I think it doesn’t balance but stop charging cells when they reach 4.2v so essentially I think it does the same thing.


#5

this one has a strange over charging number at over 4,3V which is strange.


#6

Does it stop charging if one cell hit 4.2v then stop the rest as other wise may as well not use it.


#7

amps too low for discharge


#8

Just get it from SuPower or Besttech, tried and tested, and as cheap as you can find.


#9

i am doing my first build and i am going to build my battery pack from cells i toke from laptop batteries and i am not going to use a BMS, i know many people say its a must but this is how i see it , i can not trust a bms that i dont know if it works or not and i dont know when its broken or not and it can cut power off your board when you exceed the amps it has or if a sell fails, i think thats a choise i should make myself , and about balancing batteries , i am going to wire my batterie with the balancing wires and charge it with a balance changer , that way each time i charge my pack i know its balanced


#10

Well I’m using a bms to only charge. So for discharge power goes straight from battery to switch the esc. But charging goes through bms so no need for a balance charger just laptop style charger.


#11

A good BMS, Like the ones @chinzw recommended will protect each cell from over discharging and from over charging by regenerative brakes.(If using a Vesc which has regen brakes)
This is why it’s such a good idea to spend a little extra for a quality BMS than can handle discharge amps.
Especially if your building a pack out of used laptop batteries. It’s unlikely that they will discharge evenly.
And you can trust your bms if you buy a known quality brand.