Some updated information regarding the switch, we have done some testing and decided that even at low currents like 50A constant heat-sink is required so we are making a aluminum case there MOSFET will sit inside and PCB will cover it.
The price will be 70 eur + VAT + Shipping.
It will be available in 1-2 Weeks ordered new PCB today.
For the Spark Switch , I saw someone sale it with IRFS7530 MOSFET and someone sale it with IRFS7730. which is best for use?
They are all too small for this application 
Thanks. good to know it. For the MOSFET of your Sparky switch, is it SOT-227 ?
It’s mosfet in SOT-227 package
Just curious what voltage this was at?
10S didn’t have other batteries available, but it should work same with 12s and 14s
Was just trying to get a ballpark for the wattage passing through. Thanks…
quote in total, 50a is not fat, it is not that much.
put another way: a 300a esc that can only do 50a… is not that much
I said 50A needs heatsink not that it handles that much maximum
What mosfet are you using exactly? I would try to find the one within desired Voltage&Amp ratings and lowest possible drain to sourece resistance [Rds on], that should keep temps as low as possible.
I have already found one and calculated everything required for it 
where can you buy fuses?
Mouser/Digikey any electronics store
Today received the PCB and probably tomorrow the parts so I guess early next week it will be available to buy early version
Looks incredible!
How much will it be in the states?
70 eur + Shipping
