Hi Frans,
Running any battery powered machine, Car , Buggy, Tank, Aeroplane, Boat or Helicopter etc. will be fine with a battery pack like that. M/A or milliamps is a measure of capacity and by that I mean a 4000 ma battery pack has twice the capacity of a 2000ma pack. So theoretically you should get twice the running time with the larger pack as used in this example. Therefore in effect, you will not cook the electronics in your Tiger.
What you have to realise is that higher capacity cells are larger than lower capacity cells, so space might be a problem. Having said that a lot of people here remove the baterry box from their tanks to give them more room for higher capacity battery packs.

Hope this help.

Nick.