License to DIY – Sector 9 Downhill Division

Sup Folks,

Figured I’d put some words and pictures together of my first esk8 build, the challenges I’ve had, and how it’s all going.

During COVID lockdown in Melbourne Australia, I needed to keep busy, so I started skateboarding again. Mind you I’m 42 now and the last time I was at a skate park I was 16. For the most part, it was fun learning again although falling consistently has its toll.

Someone mentioned that I should look into electric skateboards, WOW my mind was blow. Over the years I’d amassed a collection of RC cars and trucks and from a technical / build perspective it seemed like it would be an easy transition to get an esk8 build up and running…. Boy I was wrong….

Deck: Sector 9 Downhill Division – I like the look and the concave, the only limitation is the wheel size. I have no risers and am using 83mm ABEC 11’s. I did try 97mm although wheel bite got me, I might be able to get away with 90mm and some small risers though.

ESC:– Flipsky Mini FSESC 4.20 50A 4.12 with Heat Sink. Good entry-level ESC, I had issues with the capacitors bending and disconnected (Almost sending me flying off the board), this required me to solder them back on and add a bunch of hot glue to stop them from moving. This seemed to have fixed things.

Battery: Alien Power 10S3P (Samsung 29E Cells) This was a wakeup call for me, while I could have plugged in a few LIPO packs to get going I wanted a more elegant solution. This is where my mind went into overdrive as I’d never had to think about wiring a BMS, Laptop charger, Spot welding, Insulating P groups, Buying the right nickel strips ETC. I did look into various battery builders and got scared quickly there were just too many things to think about.

This being the case I decided it would be easier to go for an off the shelve solution that’s more plug and play, this would allow me to get my board working and give me time to learn the ins and outs of esk8 battery building.

Enclosure: FOOOOK, another headache I need to overcome. I made various attempts at using Kydex although was not satisfied with the outcome as it just looked janky. Seems as though if you want the absolute best results using Kydex you need a vacuum bench to get the shape Micky Mouse. I settled on using my limited metal fabrication skills and crafting one out of sheet metal. While this seemed to work it was not ideal, more on this later on.

Wheels: ABEC Flywheels 83mm

Bearings: Bones Ceramic

Trucks: Torque boards caliber II style

Motor mount: Torque boards

Pullies and gears: Torque boards 16 and 36

Motor: 1 X Torque boards 6374 190KV

End Result

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Love the first DIY build as an entry into the hobby. I followed the same path.
Looks great for a first build :+1:
If you’re interested in enclosures and battery builds, plenty of info on here to learn from. Now ride it!!

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@glyphiks what did you do to scare this man?


Nice Job @Regular_Michael! If you ever want to upgrade to a better esc and better battery (because 29E cells really aren’t that good and you probably overpaid way to much for such a pack), @glyphiks is the Straya esk8 weirdo if you need anything. Half Dingo half wombat, he likes to drink and build batteries ( great combo btw, you should try)

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Probably what I do that scares most people away… gave them the quote.

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Man if this is your first build in the diy world, please don’t look at mine. Yours is streets ahead :rofl:

Solid effort and clean result dude

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Those beers aint paying themselves.

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Once you see enough videos of batterys catching on fire for no reason and exploding, you tend to say maybe I shouldn’t cut corners on a literal bomb but maybe that’s me idk
Also nice build man
@Regular_Michael nice build man definitely better put together than my first

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Not my build!

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Fooq I didn’t @ him

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This build is a few months old now (Even though the post is new – I’m a slaker), I rode it 3 times a week for 8 weeks where each ride would last for about 20KM. This was during the great Victoria lockdown where every resident was prevented from traveling no further than 5 KM from their home.
Eventually, the enclosure gave way, bolts came loose, it warped and rattled around so much you could hear me coming from a mile away. It was embarrassing.

I was about to order a Jet Spud SS enclosure from eBoosted as the size seemed to work then I found that there was a local guy who “allegedly” knows a bit about esk8 that may be able to help me out.

With that said I put myself to task for a full battery rebuild, the Samsung 29e cells aren’t the best although I don’t want to throw the baby out with the bathwater. They served me well for a short period of time so I’ve decided to re-use what I have and hopefully make it better.

List of shit I went out and bought to get the job done - 10S3P conversion to 12S3P.
• XTAR VP4 Li-ion Charger - liteshop.com.au
• Digital Multimeter – jaycar.com
• Polyimide Hi-Temp Tape - jaycar.com
• 6 additional Samsung 29e Cells – Pirez.com.au they have a shop front around the corner
• Li-ion cell insulation battery gaskets - eBay
• Li-ion cell insulation battery paper - eBay
• D140 12S BMS and nickel strips from LiTech.com
• Momentary switch - eBay
• Starter relay from a 4 stroke bike – My shed
• JetSki battery - Courtesy of my Kawasaki Ultra 300X



I’ve done my best to make sure I’ve wired this up correctly, I would appreciate any feedback you folks have. I’ll be looking to buy an antispark switch soon.

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Lol. Who? I know a good portion of the DIYers around Melbourne.

If they were talking about me, they were wrong. I know fuck all about esk8 :man_shrugging:

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@Pottsy you know a bit about this bms right?

@Regular_Michael looks like you’re gonna hook it up to control discharge… any particular reason?

If you are running a discharge bms with a switch, i don’t see the need for an antispark… or am I missing something?

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Yeah do everything as pictured but just put the neg terminal from batt straight to the antispark/esc/loopkey

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I recommend safety goggles at first (from experience)

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@Pottsy @glyphiks Thanks heaps for helping me out guys. I thought I had it then went back to the ref images and saw where I think I went wrong. The issue I have is that the BMS I have has two B- points on it and the BMS references images I have only have them with one.

I’m not sure if I hook them both up to the negative on the 1st P group though?


On that esc they are linked, so it wasn’t needed.

mine did end up blowing the trace though so I guess best practice would be to connect them both but I just ran a separate wire from the main b- to the header pin in the balance loom and never had another issue.

I was going for simplicity. I’ll dig up the picture


And where it blew the trace

Update time,

I figured that the eBoosted Jetspud SS enclosure would be a good fit for my Sector 9 downhill deck and battery layout, so I committed. Now time to put things back together again.

This was my first battery build/rebuild and to be honest it was absolutely time-consuming and daunting. It’s not quite that HD hardcore battery porn, more like amateur hour battery porn :slight_smile:

All up I’m pretty happy with the outcome considering this is my first DIY and big thanks to everyone who helped out with parts and advice.



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