Size of SLA battery for ice fishing sonar?

[BearLakeFishGuy]

Thanks for the replys. I ordered another 12v, 7Ah SLA. My last SLA lasted 10 years, maybe 12? The Lithiums are nice, but when they are that small, there isn't a lot of weight savings compared to group 27 or 31 sized boat batteries. A 7Ah battery will power my new depth finder for something like 26-31 hours depending on backlighting, etc. which is WAY more than enough for me. My ice trips are 4 to maybe 6 hrs long. I did pick up a 1.3 amp (1300miliamp) charger so I won't have to use my large car charger at 2 amps any more. Cabelas has the 7Ah batteries on sale for $19.99. I needed a reason for a Cableas trip to pick it up!