battery connector pinout

[arnlej]

Hi,

I am thinking about making my own additional battery pack, connected with vampire plugs on the battery connector.
Battery would be a 16s1p 26650 LiFePO4 with its own BMS.

I would like to use the stock charger (on the XLR plug) to charge both batteries at once, and to be able to turn on / off both batteries with the original switch.

For that switch I am looking for the pinout of the big 16 pins battery connector.
Has anyone done that ? (I have a V1, not sure it is the same for all models)

So far here is what I have read or tested :

1 : blue : BMS switch when shorted to Bat -
2 : not connected
3 : yellow : rear led ?
4 : orange : rear led ?
5 : black : BMS ?
6 : green : BMS ?
7 : Power Bat GND, connected to XLR port pin 1 : charge GND
8 : Power Bat+ (via BMS)
9 : violet : connected to XLR port pin 2 : charge +
10 : red : BMS ?
11 : brown : rear led ?
12 : grey : rear led ?
13 : not connected
14 : white : BMS ?
15 : Power Bat GND (connected to 7)
16 : Power Bat+ (via BMS) (connected to 8)

Thanks,
Arnaud

[Lia]

As long as you tap into the large red and black wires off the connector you should be able to draw from the external battery and charge it too when connected. Just make sure they're the same voltage at the time of connecting. Depending on what hardware you're rocking you may need to change up where and how you connect the battery to the board. VnR works fine on anything 4209 and earlier.

Sonny Wheels did a fairly good Radimklaska has created the page to better document technical data for the boards which so far has some pretty decent information.

[arnlej]

Thank you Lia, excellent ! I might as well solder.
I did not know Radimklaska, what an impressive work !

How did you manage the "on/off switch" of your external battery ?

What I understood from the (great) Sonny Wheels video : there is no switch for the external battery, since you can plug and unplug it, and since its BMS is integrated in the EGO battery.
I find it potentially unsafe (if young children...) + it takes some brain to think about connecting this before that....

That is why I am looking for a way for the external battery pack BMS to share the onewheel switch with the internal battery pack BMS.

[Lia]

@arnlej NP, I only found out about their work the other day :)

For my battery I didn't bother with a switch as is the same with most. To prevent kids or myself shorting them I've printed covers for the connectors or you can usually buy them cheap.

If you did want to connect the external pack so it turns on/off with the board you'd want to get a BMS that will turn on with a momentary input since the power button on the OW isn't toggle/latching and is instead momentary. If you could get one then you could in theory connect up the thin blue wire and either of the larger black wires to trigger the external BMS. I briefly went over tricking the OW BMS to turn on with this method in another post.

[arnlej]

@Lia said in battery connector pinout:

If you did want to connect the external pack so it turns on/off with the board you'd want to get a BMS that will turn on with a momentary input since the power button on the OW isn't toggle/latching and is instead momentary. If you could get one then you could in theory connect up the thin blue wire and either of the larger black wires to trigger the external BMS. I briefly went over tricking the OW BMS to turn on with this method in another post.

I saw your video before, i did not know it was you, thanks !
Yes that is exactly what I want to do.

Most cheap BMS don't have switch, some do, and I feel it will be difficult finding one compatible with the proprietary FM 60V shorted to GND pulse.

Maybe the way is to add a "low pulse trigger" latching relay to a BMS with a switch :
either directly on blue pin #1, either through a resistor divider to lower its 60V voltage.

[Lia]

@arnlej Glad you found it useful :)

Might be difficult to find one and cheap. For my XR (15s2p) I made a 15s4p battery using Sanyo 20700b cells with this BMS. Sadly no power trigger on it.

Did a bit of googling but I'm not finding much, most BMS's appear to be a switch rather than momentary. I guess you could always engineer your own relay and IC to do the same job.