Mah is a measure of capacity it doesn't tell you anything about the max current output or the voltage under load (when current being drawn to power motors) as long as voltage doesn't change (see go above max for components) you're not likely to fry components but if put a heavier battery on you may need to tune and may end up losing flight time (rocket equation but for quads adding more "fuel" adds more weight, takes more thrust to counteract the force of gravity on the extra mass so using more of that "fuel" to just carry itself and trying to stabilize or fight the inertia)