By overkill I meant you have a lot more than you needed for a days flying. I don't use batteries that large on twins. 2,000 mAh at 4.8v provides two continuous hours running with a little to spare on a twin.

People buy more battery in cost and weight than they need because they do not understand how an ignition works. More is not always better, 6v is not optimum for a 4.8v circuit, and having more generally costs and weighs more. No big deal if that's what you seek but many are looking for the cheapest an most efficient way.