The FPV-POWER 7ah battery is perfect for fisherman running fishfinders like the Lowrance Hook 4 or the Garmin Striker 4. At full brightness, you can expect 18-20 hours of use! These batteries are also great for running other low draw electronics such as lights and can also be rigged up to charge phones and cameras!
The FPV-POWER 17.5Ah battery suits kayak fisherman who run larger fishfinders/GPS which typically draw more than 1A. If drawing 1A, you can expect around 17 hours of use but you may need a voltage regulator as some fishfinders need a minimum of 11V to run.