Battery size for fishfinder

[Mr. PapaGeorgio]

Installing a Garmin Striker 4 fishfinder, what is the minimum size battery needed. No other equipment will be wired to this battery. TIA

 

[FunInDuhSun]

I had a portable FF that ran off 8- D cell flashlight batteries. It typically lasted for the entire summer.

FWIW, on my tinny I use a lawn tractor battery. It not only runs the sounder, horn, and running lights, but also starts the 25HP outboard.

 

[matt167]

Motorcycle battery could be enough. A lawn tractor battery is cheaper however

 

[Alumarine]

I've also run them on CPS5.5-12 and SH1228W UPS batteries that I've had lying around.