HDS battery experience/suggestions

[absentx]

I run a Hobie Outback that I am outfitting this weekend with my HDS-5. I have used the HDS-5 for ice fishing for a year an a half and just decided to rig my kayak up for it too.

I am not sure what battery I should use for it. I am going on a seven day on water fishing trip in a few weeks and I most likely will not have anywhere to recharge. I was thinking about possibly buying a 20 amp hour battery. The footprint isn't too annoying and if I had two I could put one at front of boat and one at back to even out weight.

They make 35 amp hour ones but stuffing one of those into the hull seems kind of silly. Maybe everyone thinks two 20 amp hour ones is silly too, but I really like having the depth finder along on the trip, so just trying to see what other people's experiences are.