Onewheel V1 broken
My V1 bit the dust, it won't power up. I plugged in the charger and the board powered up, but the lights came on too. Charger showed green.
The app showed everything except battery level (0%) and I can balance the board with the charger plugged in. I left the charger on for a couple of days, but still no joy.
I tore the battery box apart and measured the cell voltages and they ranged from 3.47v to 3.50 v, so it seems the battery is fine.
If I plug the battery directly into the controller, the board works fine. I assume the BMS is gone.
I'll try to repair the BMS as I have identified some of the components. The two mosfets measured fine, but I think the mosfet driver (m1271) may be faulty, if I can source one, I'll try to solder it in.
Anyone know who can repair a Onewheel bms?
blkwalnutgrwr last edited by
@lemur -- When my V1 BMS got water damaged I just bypassed it. But there are people who can take a BMS and repair it. Try StokeLifeService, or the Onewheel Facebook groups -- maybe especially the Onewheel DIY Squad.
Lia last edited by
@blkwalnutgrwr It’s pretty cool that the V1 can have the BMS entirely bypassed. Makes diagnosing stuff a little easier.
From a safety standpoint it’s a bit iffy but theres nothing stopping you getting an off the shelf BMS to wire in between so you can retain some cell balancing and protection.
Thanks for the leads. I'll try both.
I was thinking of bms bypass and using a external xt60 connector with a matching male or female xt60 that has a wire loop to complete the circuit.
Better than an on-off switch that can accidentally be shut off.
blkwalnutgrwr last edited by
@lemur -- I did hear the story of someone who put the whole Onewheel battery in a backpack, then riding trails through the woods snagged the cable on a branch and was suddenly powerless.
@Lia -- Several months in and more than a thousand miles later I must say I feel safer without interference from the BMS. The biggest downside is that I had to break the push button switch habit in my own neuro-circuitry.
lemur last edited by lemur
Good to hear that a bms bypass works for the long haul. Thanks.
I just ordered some mosfets and mosfet drivers to try to repair the bms.
They were under $15 for a whole bunch. If that doesn't work, then it's the bypass.
I thought of a lithium ion bms, but the cut off voltage is too high for iron phosphate cells leading to early cut-off and crashing.
Senior Coffee last edited by
I've got a Plus on the way with 189 miles along with a two-x kit to be installed. During the installation the BMS is coming out. I've owned a number of Onewheels and EUC's and I'm done with the random errors and shutoffs from bms's.
Sounds good. A bms seems to cause problems.
Good thing all my Onewheels are "hackable" unlike newer ones with "married" battery, bms and controller.
That sounds doable with a generic 14s bms for charging and balancing but not for discharging. Discharging straight from the battery pack.