What kind of mobile charging station would be needed? It’d have to be HUGE! And what would power IT? Solar power?
And would the tank commander radio: “Gotta stop engaging with the enemy. Charge is down to 0. Send the mobile charger NOW!”
- reply: “Sorry, sir, the mobile charger is out of battery power. You’ll have to wait a few days.”
On the other hand, what happens when the enemy cuts your supply line, and you can’t get gas for your tanks? But if you can switch to reserve electric power, at least you could manage to hold out for a bit until you can get gas.