How many H batteries will a deep cycle battery charge?

[Manny D]

A deep cycle battery is I'm looking at is:
45AH 12V
Can anyone say how many H batteries it could charge before requiring a recharge itself?

 

[BobW55]

Depends on the the charger you are using and how depleted the batteries are.
Using my HiTech X2 charger off my car's Auxiliary port , I was able to charge 2 batteries before the low voltage protection of the car's battery kicked in and shut it off. Most of us at the field run the engine while recharging.
All you could do is try it and see how far you get.