Hi, I recently bought a Benchwheel Dual to see if electric skateboarding was for me. Turns out it very much is my thing and I’ve pre-ordered a Raptor 2. In the meantime I’m looking to upgrade the Benchwheel because it’s range has really dropped off and I’m thinking it’s the battery.
The board currently has Samsung 22p cells in a 6s4p configuration. Does anyone know of any reason why I couldn’t replace the cells with Samsung 30q cells? I am assuming that the existing charger and hardware will continue to work as expected but would really like to get some feedback before shelling out on 24 * 30q cells.
You absolutely could, if you’re prepared to solder them all up. You’d get a nice bump in total capacity as well.
I’m no expert on batteries, but from a engineering perspective I don’t see any reason why not. The voltage will remain the same, I doubt the BMS cares about the amps, the motors might wear out pretty quick with the extra amps though.
Thanks for getting back to me guys. I’m waiting to here back from a company that specializes in custom battery packs. I believe the heat from soldering can be damaging so I’m looking to get them spot welded.
Right, I’m off to buy some cells, hopefully I’ll have an update soon for anyone else considering doing the same.
The BMS DOES care about amp draw (as it’s probably fused), but the ESC will only pull as many amps through it as it was originally designed to. It’s not that the upgraded battery will push more amps just because it can. The board should feel exactly the same except with more range and possibly less voltage sag.
I repeat, the BMS does not care about amps. Specifically because it is NOT fused. I know this because I bought one for my kid and I work on it all the frikkin time.
Fair enough. My mistake. But regardless, the ESC isn’t going to pull more current than it originally did.
Quick update for anyone interested. I assembled a new battery pack using new Samsung 30Q cells and can confirm that everything is working great. I’ve used it for a couple of weeks and it performs better than when it was new.
As expected every area of performance is improved, hill climbing, acceleration, range, top speed.
I haven’t had to change any other components and the charger still works, although it takes a little longer to charge from flat which is to be expected.
Very cool! I have the same board and am also looking for an intermediate solution to get a bit more consistency of the 1800w dual. Their shop told me my board would have the 25r Samsung batteries but it’s still using the 22 ones… kinda pissed about that!
How much did you end up paying for the custom battery pack? Did you provide the cells to them? Lastly, would it be OK to ask for your order no. from these guys? Would make it a lot easier to explain to them what I am looking for
Great!! I got the same e board with same probelem…I dont know alot about the technical stuff…
but is it possible to connect a E-bike battery 36v 8.8ah ICR18650-22P in chain with my current battry on my benchwheel?
bisoe I honestly don’t know. The OEM battery is 6s4p which outputs around 24v, 36v might be to much.
Thanks, much appreciated. I went DIY as well!
How often are they out of stock? This is the best price I’ve seen
True, but they’re back in stock NOW!! lol
Oh I’ve just re-read your message. Yeah, quite often out of stock. They came back in stock today
@cradster - kudos man for diving in and DIY the battery!
For the next person who finds this and wants to duplicate, i’d recommend one of the arduino spot welders over the ebay one linked. Simple and less $. You have to use a car battery and a bit of fiddling for settings, but likely similar to the 788 welder - until you find setting that gives you a good weld through your thickness of nickel strip chosen. You can build your own and recommend upgrading the FETs and adding TVS and Shottky diodes for longer life. Search the forum here for arduino spot welder and you’ll find several threads.
Nkon is great for prices, but super slow shipping sometimes…
HTH - GL all!
I’m going down this route for a cheap spot welder for my pack. No need for these expensive pre-built ones if you’re careful.
Hacky, but it works, I’ve tried it.
@darkkevind - hell no. When i buy a few hundred dollars in new 18650 cells i’m not melting contacts “carefully” with a car battery.
You can do you, but i’d prefer not to pierce the battery and have bad things happen because i wasn’t careful enough.
The nicer store-bought welders like the 788 listed, and arduino spot welder use timed pulses so you can consistently control the weld.
I’ll be modifying my setup to include a solenoid relay switch to control the pulses… no risk