Minimal Compromise Battery Setup?


Wanted to bounce some ideas around and see what direction I should go.

I love my board and looking to upgrade it to a dual drive with killer range… Except I have an addiction to punching the throttle on the empty roads I encounter here in London (they exist!).

I know the pros and cons of Lipos vs Liions but I’m after a solution that minimises these compromises they have.

There have been topics about huge capacity Lipos (such as 22Ah Gens Ace Tattus or Overlander 22Ah batteries) and these would really work great for range and reducing voltage sag. However, having an 8Ah 9s setup myself I’ve noticed that (after about 200 miles) my acceleration has dropped and so has my top speed (35mph to about 28mph now) and I’m assuming that’s due to the reduced C rating my batteries have had over their usage? Not sure if its my VESC settings but that’s besides the scope of this post.

So I’m toying with the idea of Liions but even a big pack (12S8P) would still suffer from a lot of voltage sag with how I ride.

Should I just stick to high capacity 25C Lipos? Are there alternatives? The kicker is I want to keep everything under the deck (40" stiffy).

Thanks for your input.


Surprising drop in 100 miles. I think range would suffer but not discharge ability

Li-iron cells maybe. The red headway cells

What cells are you using?

think you should test your cells and charger to find out what happened to them before pulling out your wallet.

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at 8p even saggy liion cells like the hg2 and 25r would no longer be an issue, since you’ll have 160amp! available, which I doubt any setup will even be able to approach before melting the vesc down to molten metal

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Agreed, a dual vesc wont sag a 12S8P pack. It will be awesome. Build it please.


what deck do u plan to use to fit a 10lb battery pack?

or are you picturing a trampa board with the battery on the top center?

@Hummie I did see a drop in range but I assumed it to be because I ride faster now. I also tweaked VESC settings to have higher motor and battery amps (80 each) and max Watts (1900) and I’m unsure if I pushed em too far.

@Idle they’re 3x turnigy 3S 8Ah 30C batteries. They’re all low resistance but I haven’t checked how much capacity the charger gets them too as AFAIK that’s not accurate.

@thisguyhere I was hoping to use 30Qs, they’re rated to 15A each right? So 12S8P would give me 120A? Seems a bit low? I have a £50 9-ply maple deck that’s quite stiff and w-concave. How much do you think I can fit underneath? I want to go BIG since liions are cheaper than massive capacity lipos…for science of course. I’ve a 70cm wheel base to play with (- space for 2 VESCs and a BMS).

@BigBoyToys thanks, you answered a bunch of my questions previously and I know you push things. If you and @thisguyhere reckon its fine then I’ll make the investment. How big do you think I can go? I’ve a 70cm wheelbase to fit everything and I don’t mind reverse mounting my morots…will get Carvons one day.

30q are safe at 20a

no, 120a is way overkill. even chaka and lhb big ass packs are not even approaching those values. if u manage a 8p pack u may be going after the biggest pack record.

in terms of fitment, you’ll have to figure that out on your own

Could have sworn I’ve read posts from last year that said someone already had a 12S8P.

Eitherway, I’m reassured and think I’ll be going down the liion route for this upgrade. Thanks a bunch!

Edit: yeah I think @Ackmaniac has a 12S8P pack made of 30Qs. If so, how do you fit your batteries?

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How much range are you looking for? You could use lower capacity/higher discharge 18650s so you wouldn’t need so many cells in parallel. A 12S8P of 30Qs would give you 160A discharge and 1065Wh which is like a 100km of range… I doubt you need that much.

These are good for 25A:

And these for 30A:

To get roughly the same discharge as the 8P 30Q pack you’d only need a 5P of the HB6 and you’d still have around 30km of range.

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Mine look like a doubled 12S4P. The cells are in sleds. The reason i went for such a big battery is because first i wanted to use harvested old laptop cells. And for that i had to use many of them in parallel because of the low current they can provide. But after a while i needed real power so i replaced them with the 30Q.

And it’s just awesome. You don’t need to care anymore about your battery. Just simply go as far as you want because your legs will give up earlier. And it is still a very usable board. It weight’s around 2,5 kg more than a 12S4P but that’s it. It’s configured as my speed board (long wheelbase, 60 km/h max) for the road to do long distance stable and fast.

Some pictures of the old version of the battery can be seen here. The new one simply has the 30Q cells.

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But u have li-ion cells , and only 9s, and after 100 miles, and increasing the motor and battery Amps, you have a reduced top speed and acceleration I think u said.
Id Get the vesc recording to see what Amps ur doing and do more in series

pshhh my 10s6p weighs 9lbs, 8p will weigh closer to 13lbs

Each cell weighs 0.1lbs. +.5lbs of wires and stuff. My 10S4P weighs less than 5lbs. My 8S13P weighs 11 pounds

Longhaired boy did 12s9p i think

I’ve been thinking and I’m trying to go over 1200 miles worth of excel spreadsheets and come to the conclusion that I’ve probably noticed a dip in speed for a large number of factors, namely:

  1. higher wind speeds since I first started riding in the summer.
  2. top speeds were achieved on still days that were very flat.
  3. A more gradual throttle curve at higher speeds means that I don’t get the speed kick from 20+mph like I used to.

So I’m going to spend some time performing tests to quantify things and control or eliminate as many variables as possible and see what I can conclude from that.

Noice! I need to see this and take inspiration. Did some rough calculations and reckon a double layered 12s4p would fit under my board. Will see if I can tier a 12s5p and 12s4p together.

Quick question:

  1. How long does it take to charge?
  2. What’s your charging setup?
  3. What does the latter part of ‘Max. continuous discharge: 15A(at 25°C), 60% at 250 cycle’ mean? Is it talking about max discharge?

With question three for @Ackmaniac it sounds like li-ion do degrade their c-rating a lot after 250 cycles. Cells lose capacity and discharge ability w cycles . another reason to go li-iron. The red headway cells have a high discharge ability and I’ve seen video of people overcharging and shooting w a bow and arrow or a hacksaw. No problem no fire

LiFePOs don’t lose C rating as much? Other than safety what other benefits do they have? I ruled them out previously because they’re less energy dense and expensive