Hi All,
Sorry, I didnt saw your messages (Thanks for Help)
Now I have completed Nitro to Electric conversation for my Kid (6 Year old only - no much speed required)
I have used Shaft Coupling from below link
https://robokits.co.in/mechanical-parts/coupling-and-springs/black-aluminum-alloy-motor-shaft-coupling-55mmHere is few Pics of new Shaft Coupling, Motor & Battery Setup

Need help to convert HSP 1/10 Nitro Truck into Electric

Need help to convert HSP 1/10 Nitro Truck into Electric

Need help to convert HSP 1/10 Nitro Truck into Electric

Need help to convert HSP 1/10 Nitro Truck into Electric