This emtb board is INCREDIBLE! As I’ve said the battery lasts an extraordinarily long time. If you compare to an Evolve GT all-terrain set up your lucky if you get 7 to 8 miles. I thought I was going to do more Offroad which is fun and enjoyable but I’ve still been doing more road riding and the overall experience is way better than a regular electric skateboard. The bindings allow you to carve like you are defying gravity. Most of all Kaly is an incredible board builder. He is an engineer with fantastic knowledge of the intricacies of this wonderful hobby. I cannot recommend him any higher than I already do. You can certainly do it yourself but I would recommend using an experienced builder like himself because he understands a lot of the complications and intricacies avoiding many of the trial by error that do it yourself builder will experience.
You can also buy a Bluetooth module and use my app to see the real timedata. Then you can define by yourself at which voltage the battery has which percentage.
Do you sell the modules or have a link to it?
Don’t forget to mention it only works with android! Otherwise I’d be all over it
Yeah sorry, it’s only for android. If you don’t have one I think it’s worth the 3 dollars for the Bluetooth module and borrow a android smartphone from a friend. This way you can learn a lot about how your VESC works. More info here.
Just port it to iPhone already!! Lol
it seems terrible on paper but in practice with the higher P counts (4 and over) its not as bad as it seems like it would be. There’s no free lunch, so if you want more amp hours you lose discharge capacity, if you want more discharge capacity you lose amp hours, and if you try to do both by achieving some kind of balance you get various degrees of voltage sag. That’s my observation anyway.
They’re just old and outdated. There’s better options now that don’t break the bank.
Samsung 30Q from Nkon @ $2.75 if you’re outside Europe. 3Ah per cell, much better power delivery than 25Rs. 25Rs sag as much drawing 5A/cell as the 30Qs do drawing 15A/cell.
Sanyo GA cells are more expensive ($5 a cell). They have 3.5Ah/cell and sag just as much as 25R cells drawing the same amount of current.
Where are you getting those prices and in what quantities? I’m not seeing that kind of pricing anywhere i would actually be willing to buy from. I don’t buy cells from ebay or alibaba, i get them from lionwholesale usually but i try to make sure whoever i get them from are in the US and can actually stand behind a product without getting returns lost in China Post territory.
the 30Q has a max continuous discharge of 15Amp, leaving a 60Amp pack in a 4P config. The 25R has a max continuous of 20amps and a sub-second burst capacity of up to 100Amps. That’s the trade off. You either get more amp hours or more continuous current at a time. I’m betting voltage sag correlates with max continuous current because i keep seeing “better batteries” around that don’t deliver their juice as fast or as hard.
The Sanyo NCR18650GA deliver a whopping 10amps max continuous. Not interested.
So yeah, by limiting their current draw within the cell, they have effectively not allowed you to draw the kind of power that not only results in voltage sag but also results in higher discharge capabilities and a lower amp hour spec.
I guess that makes them better, i don’t know. I build 80 amp packs and use a 60 amp BMSs and try to tune my VESCs to not launch like an out of control rocket, so the voltage sag I am actually seeing on the street just isn’t anything i wouldn’t expect. Out of any cell.
So should I use 15amp cells with a higher Ah rating so that my volt meter doesn’t drop a percent or two while I’m hitting the throttle? Or should i just let the hardware draw what it wants from a set of cells that are willing to give them their all?
It deserves a good pondering i suppose.
he gets them from nkon.nl - a european supplier that also ships to the US apparently.
The current ratings don’t mean anything. You need to look at the discharge curves. You will see that the 30Q don’t just deliver 15A but can go much higher. You will also not drain them continuously at that current so the added capacity and less voltage sag make a big difference compared to the higher temperature increase they see at continuous high current use.
We actually need to get away from this “I build 80amp packs” as your basing this info solely on the rated current. It says nothing about the actual performance of the cells. 30Q would make a rated 60A pack but would kick your 80A pack’s ass 
I’m curious about those batteries myself. I might try them out in my next build.
But even on that nkon.nl site, 40 of them still works out to about $3.30 (cause no VAT). I want that $2.75 price 
@longhairedboy I source 30Qs from Nkon and have them shipped to the US. I source GAs from Liionwhesale too.
Stop looking at just the rating. That’s the issue with a lot of people here, you see numbers and take them by heart without understanding the reasoning behind them is. Look up the spec sheets and read them if you have the time. The reason 30Qs are rated to 15A is because if you continuously run them at that current and charge them at 4A, after 300 cycles, you only get 73.8% of rated capacity. That’s where Samsung decided to draw the line. In the same spec sheet they show that for 22A continuous and a temp cutoff of 70C and charge at 4A, after 250 cycles, they get 72.4%.
Similar stuff is done by Panasonic. You can run the cell at higher currents CONTINUOUSLY by sacrificing number of cycles you can run them for. Key word there is continuously. We do not do this unless you’re climbing an endless 15 degree incline at 20mph.
Check these graphs out, I’ve posted them several times:
First is Sanyo GA vs 25Rs: This is continuous current running through them, the vertical difference between curves is voltage sag at that specific capacity. The red curves are GA and blue is 25R. From top to bottom 0.2A, 5A and then 15A. Henrik’s battery holder failed on one of the 15A GA test, that’s why it is cut short. The other one he stopped at 75C.
The takeaway here is that they have less voltage sag than 25Rs, aka they can deliver more power for the same throttle setting at the same discharge level. Also, if you were to throttle to 15A with 25Rs sag down to 3.2V which is most people’s soft cutoff after 1.125Ah consumed. With the GAs, you sag down to 3.2V after 1.55Ah consumed. The gap widens if you bring the cutoff lower.
Next 30Q vs 25R: Same thing as before, Red is 30Q, blue is 25R. Top to bottom 0.2A, 5A, 15A
Here, there is a big difference. The 30Qs drawing 15A sag down as much as the 25Rs drawing only 5A after 1.25Ah consumed (which is 50% capacity of 25Rs). At 15A and 1.25Ah consumed, the 30Q outputs 2070W, the 25Rs on the other hand output 1902W. At 15A, 25Rs sag to 3.2V at 1.125Ah, 30Qs sag to 3.2V at 2.125Ah, that is almost double!
As I said 30Qs are much better at delivering high power than 25Rs. GAs can deliver slightly more power while having 40% more capacity!
I hope this is clear, I’ve been writing this on and off throughout the day while flight testing lol.
I intentionally left out the 20A case. Henrik tested the 25Rs a long time ago and he didn’t measure temperature back then. We cannot say that the cell did not overheat as he didn’t measure this. He didn’t test GA cells at 20A because he thought they would overheat (and he broke his cell holder), rightly so, but again, we do not run continuously. He stopped the 30Q test early at 20A because of heating. He got through 2Ah before he stopped the test because the cells reached 80C. That would be. 6 minutes continuously at 20A per cell.
It seems that Nkon’s prices have gone up since I ordered
That’s a terribly convincing argument. I think you’ve made a believer out of me.
The more people get on board and spread the knowledge the less I will have to repeat myself and the sooner esk8 will leave behind using an overrated and outdated cell! 
Clearly we need a battery FAQ so we don’t have this conversation every week in yet another thread
I wrote this 2 months ago in a battery thread and was wondering why companies like Enertion are still using the 25r. I think it´s just the “we´ve always done it like this and keep doing it like that” thing. Or maybe it´s the price point - 25R are slightly cheaper than 30Q.
well at least he is trying:
yep! So I think we have to spread the word of battery gods to the world and after a few months we´ll be having more people with cool packs on the street that also last longer 
I still feel bad about building myself a 25R pack 