It's probably easier to just have some sort of magsafe-like connector for power and data inside the vehicle. Charge the batteries with something like USB-PD to

It's probably easier to just have some sort of magsafe-like connector for power and data inside the vehicle. Charge the batteries with something like USB-PD to get the most out of the time a soldier might be stationary in the vehicle. Use the data connection to allow everyone's communications to go through the vehicle radio.