If I needed to run it at home, I would go for the upgrade and use my AC power.
FWIW - I run rechargeable Ni-MH batteries in just about everything around the house (I stick w/ alkaline in my smoke and CO alarms). The rechargeable Ni-MH D batteries do just fine out on the ice in my old Marine Metal Products Bubble Box aerators. I charge the batteries up after each outing. Ni-MH also do not corrode/explode like alkalines sometimes do, so not a big deal if you forget and leave them in all summer.