You can't damage your electronics by going to a higher capacity battery as long as the voltage stays the same, but you're going to add significant weight by going to that bigger battery which will affect your CG and flight characteristics. Before spending your money, compare the weights and if you can, put the old battery into the plane and then add the extra to see what you'll wind up with. You may find that after the extra weight of the new battery, you also have to add weight to fix the CG. For a plane that small, just a few ounces can turn a nice flyer into a dog.