Here’s my biggest worries about the board you linked to (many of which are probably mentioned elsewhere)
To hit that $259 (ignoring that absurd shipping cost, which he may be using to make up for this super low price), he would have to cut some serious corners to have any sort of profit.
Here’s a bit of the breakdown, from what I can see, for what he’s spending, so you can compare to what we usually pay for things on a DIY board.
click me to expand
Batteries (genuine cells) - $55
Going on their battery stats, they’ve got a 2200mAh cell. That looks like the Samsung 22 (I found a 22E, 22F, and 22P which they can probably get as low at 2.75 in bulk). That cell can only handle 10A max. This is a pretty cheap cell that will definitely have pretty terrible sag at 10s2p if it doesn’t completely give up and die over 20 amps. So I also question the hill climbing abilities
65 KG rider (me) can reach 24 KMH on 15% gradient slope. And 8 KMH on 30% slope.
If they want a better cell, maybe the 30Q or 25R, you get much better stats (15 amp/3000 mAh and 20 amp /2500mAh respectively), they’d pay at least a dollar or 2 more each, which would then be $75-$100 for just the cells.
Then you have the BMS and all the other stuff that goes into it.
Hub Motors - $80 (40/each)
I question their longevity, and the website says this, which is a bit worrisome.
The PU wheels on the motor CANNOT be changed/replaced. You can always buy a new motor in my shop.
so 1. It’s probably cheap (quality) to begin with. 2. that means you’ll be replacing it even more frequently, and it’ll be more expensive. You’ll probably pay $100 each time you wear those down (see below: normally $49.90, currently on sale for $39.90)
Electric Skateboard Longboard Hub Motors
Dual motor ESC (based on pictures and his website) - $50
When you buy the ESC with case. It comes with the Remote + battery light + On/off button + Screws
When you buy Esc without case, you get remote also.
Electric Skateboard ESC
Wheels - $7
I would not be surprised if a single battery charge lasts longer than these front wheels ($6.90!!). They’re listed under the same listing for the front truck
Electric Skateboards Trucks
Trucks - $24 (10.90 front, 12.99 rear)
Looks like a caliber…isn’t a caliber. Hope it doesn’t snap while you ride them! The rear truck design looks interesting though 
Electric Skateboards Trucks
https://kieraneboard.myshopify.com/products/rear-truck-for-dual-motor
Other odds and ends:
Deck - $36
Grip Tape - $4
Charger - $13
Range
per charge 18 Km = 11 miles (Real life, 65KG rider)
…BS. I HIGHLY doubt they’re hitting that range with a 10s2p configuration. At least not with all of the other specs they’ve listed. Maybe on a downhil, going 5 mph.
Also, on the shop page, they list this:
Meepo Board | Best Electric Skateboards, Longboards Shop
Which says it’s 15.8 km (9.81 miles) range, which isn’t consistent…maybe it’s a different pack than it ships with?
Here’s my take:
Their cutting corners = Your safety. Buy something else.
Even with a @longhairedboy battery upgrade, I’d be worried about pretty much every other component as well. There are some halfway decent pre-assembled boards, and definitely some that can be improved by swapping one or two components (maybe a battery and/or the ESC) but unless this guy is literally eating his costs so you’re essentially getting a subsidized board, you will be unhappy with this board, and hopefully not dead.
