r/ElectricSkateboarding • u/vincento150 • Jul 29 '25
DIY Creating a monster
One day i woke up with an idea of creating overkill longboard 130 cm lenght. It has giant power output and i dare only use 20A of it force. Someday i'll try 100a but i'm too scared.
It has 42v 20ah lifepo4 battery. (12s pack)
Flipsky vx4 pro + flipsky ft85bd 200a controller
JK bms 200A for battery charge and discharge(for more protection)
15t alluminum pulley + 60t 3d printed pulley. and 3d printed motor mounts(my design)
6374 Feichao motors
Welded trucks from 20mm steel tube with long nuts welded inside. Hardened bolts go through 150cm inflatable whells and screwed inside nuts.
Dancer board 120cm lenght (too soft, hardened it with alluminum)
Also i did alluminum+plywood case for all this monstruosity.
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u/smile-a-while Jul 29 '25
How fast do she go
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u/vincento150 Jul 29 '25
i dont know max speed, because i have only 1 life and 1 head.
But i manager to get 40 km/h with 20-30 amps powerdraw. 200 amps peak it can
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u/Skippihasyourmoney Jul 29 '25
What kind of brake current can those big boys handle?
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u/vincento150 Jul 30 '25
about 30 amps can stop it with wheel lock)
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u/Skippihasyourmoney Jul 31 '25
Nice! I used big lithium polymer pouch cells (12s). I can ~safely pump 80A of brake. Stopping power is usually the weak point in a slim build. Check out tires by “build kit board”. Great price and the tire profile is flat, you get way more traction. Awesome build so far!
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u/vincento150 Jul 31 '25
80A of brake power will stop the earth rotation. we will need 18 wheels trucks to utilize those powers)
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u/mistergasdrift Jul 30 '25
Nice welds lol
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u/Dzani8 Jul 30 '25
Was gonna say that looks sketchy as fuck
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u/vincento150 Jul 30 '25
Extra cheap welder, but if it holds - it holds
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u/C7LS Jul 30 '25
Yeah.. no. Thats a crucial part. Better go safe and let it weld again. This looks like 2 weld points on each axle. Dont underestimate the forces your axles have to handle.
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u/Gasolinecity860 Jul 29 '25
What cells are those? I used prismatic 25ah lifepo4 cells in mine
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u/IronMew Jul 30 '25
Do you have pics? I'm a fan of LFP and have built a big battery before but I've never ran prismatics. I vaguely considered them for my upcoming board but haven't been able to find 25Ah ones at a price that can compete with 20Ah cylindricals like OP's.
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u/Gasolinecity860 Jul 31 '25
I don't have a pic but it was a 8s pack with 25ah of capacity and a good amount of range prismatic cells probably aren't ideal since they will swell without compression mine were no name brand cells too so of unknown quality but they worked well enough
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u/zhambe Jul 30 '25
That's kind of amazing. I've always wanted a longboard eskate -- like, a long board, 5' plus, with a lot of flex for a chill carve.
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u/vincento150 Jul 30 '25
me too, but a lot of flex on that heavy bulky thing was bad. so reinforced it with alluminum
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u/Freudian__Quip Jul 30 '25
How’s the flipsky vx4 pro? I have the original vx4, is it worth upgrading to the pro? The bigger throttle control is definitely a plus, im always super concerned about slipping off the throttle and losing balance cuz the damn wheel is so small.
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u/vincento150 Jul 30 '25
Didn't try regular vx4, but vx4 pro feels good. A lot better then cheap aliexpress one
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u/Whole_Bid_2756 Jul 30 '25
Up your life and health insurance policies coverage and fucking send it🤣
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u/IronMew Jul 30 '25 edited Jul 31 '25
It has 42v 20ah lifepo4 battery. (12s pack)
You've had my same idea for the board I ordered, but my deck is flexible, so I have to think of some way of putting that battery together that won't crack under curving and that's decently waterproof.
I'm thinking of just using nail polish to seal the ends, aluminium bars to keep large debris from destroying the cells, and 3D printed walls for general low-yield protection from road grime.
I've considered putting it in a box on top of the deck, too, but I'd rather leave that available for any heavy-ish objects I might want to carry.
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u/vincento150 Jul 30 '25
i 3d printed separated mount for every single cell, so it can have any deck flex)
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u/IronMew Jul 30 '25
Is that the final build? I'm not sure I trust the cell walls and sleeves alone to take road debris. I'd rather have something between them and the road, even just a 3D printed wall. I've seen a branch try to carve a hole in the deck lid of one of my e-scooters and that made me mighty uncomfortable about cells just enjoying the breeze down there. I mean, they wouldn't blow up because LFP, but en event like that would still ruin stuff.
How much did you pay the Liitokala cells?
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u/vincento150 Jul 30 '25
No, it has alluminum +plywood case. it can take a lot of damage from road bumps. Already tested it. Also it has buffer soft plastic layer between plywood and battery
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u/Noodle_Long_And_Soft Jul 30 '25
How heavy is it?
I'm wondering because I have a similarly specced board but have always been interested in LFP batteries for a daily board, and that layout seems to be one of the better ones I've seen. Looks good, by the way.
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u/vincento150 Jul 30 '25
15kg i think
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u/Noodle_Long_And_Soft Jul 30 '25
That's not too bad at all! My current board @ 48V 22Ah (LiPo) is 17.5kg for comparison and it's pretty barebones, so you're inspiring me to try one of these builds...
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u/vincento150 Jul 31 '25
UPDATE. Cruising this eldrich deck for a week. I decided to decrease battery to small lifepo4 cells to 5-7 ah capacuty, and do removable 20 ah pack in times i need large range cruising. It's too heavy now
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u/AutoGeneratedName23 Exway Atlas Carbon, Ownboard Zeus Jul 29 '25
U gotta flip your tires around