My new DIY Onewheel V1 battery replacement.
Thought I would share this with the Onewheel community. I rebuilt my dad's Onewheel battery for his dead Onewheel V1. It would only go a couple miles before nose diving and eventually wouldn't work at all. He got it right when they were released in 2015 so I'm pretty stoked to revive it and give it back to him on father's day. He'll be very surprised it still lives!
I used 14 Molicel 21700 P42A 4200mAh 45A batteries to make a 14s1p configuration.As you can see there is plenty of room for this configuration.
I bypassed the original BMS and used a DALY BMS 14S 48V 40A Li-ion Battery Protection Module PCB Protection BoardI'm using the original charger that came with it (max voltage 58.4v which is perfect for a 14s config).
Cost me about $95 total in cells and the BMS.
I haven't done a full range test bc I finished it today but so far I've gone just over 2 miles and its still at 56.5v so I'm guessing it will go about 12-15 miles. I didn't realize the on and off switch wouldn't work and it would be hot once I plugged the new battery in so I still need to add a switch. Right now I'm just unplugging the main connector and not using the cover. Any idea on what switch to add thats not huge. I'm not exactly sure how the Chibattery switch is so tiny if i needs to handle 58v and up to 30 amps....
A couple questions I have if anybody could help me.
Would the original V1 Onewheel work with a 15s1p config or would 63v kill it? I want to rebuild my brother's Onewheel V1 battery next. I own already own a Daly 15s BMS.Does anybody know the original V1 battery capacity is in amp hours? Trying to estimate new range.Does anybody know how to add an on/off switch to my battery that is small and compact yet rated for this config?Anybody have a link to a video showing how to spot weld cells stacked on top of each other? I just guessed and folded a piece of nickel strip into a U and welded to each end.... seems kinda janky.
Thanks all!
Update: June 15th, 2022
Thanks u/ComikzInk I added this antispark switch between the BMS and Onewheel controller. Works and looks great! Charging works as well with the stock charger. I was worried that current wouldn't be able to flow through it in that direction but it works fine. See photos below. Going to build a 15s pack for my brother's onewheel this afternoon with the same parts (15s BMS though). We'll see if the stock V1 onewheel can handle 63v!!!
14s 21700 battery, bms and cables fits nicely
Updated Photos - June 15th 2022
adding the antispark switch (I soldered on XT-60s connectors)
added a little electrical tape for protection (definitely a more snug fit with the extra switch)
drilled a 3/16 hole and added on/off button in discrete place
