That was my concern when making this same decision on my Natrix. I think the chance of an issue is small but since gear retraction normally occurs at a critical point (i.e. shortrly after takeoff), it's the worse time for an engine hick-up or flame out. For that reason I came to the same conclusion Juan is recommending. Just stick with a separate battery for the retracts. As you mentioned, one charge lasts a long time.

Craig