I just got my new humminbird electronics and I was wondering what kind of battery setup some of you have when running 2 color/gps units.  On my old boat, I ended up with a dead cranking battery a couple of times because I was running my gps at all times.  I know most people leave their electronics on the entire time they are out, so If I have a good crankin battery, will it last the entire day? Or should I have a dedicated battery for just my electronics?  Thanks.

If your electronics are killing your cranking battery, you either have way to small of a battery, a bad battery, or charging system problems, or are not charging your cranking battery after a day of hard use.

A good group 27, dual purpose should run any and all electronics and pumps in a bass boat all day without ever running the big motor to recharge it.  (I don't consider a stereo as part of a bass boat package)

you can pickup a small sealed electronics battery @ sportco for $19.99

they are small and compact and last a whole day.

I installed a seperate battery for ALL my accecories. I fish shallow water and have my engine and tilt/trim running off my starting battery. Dont need to take a chance on having anything else drain my starting battery.

I think you had a bad battery. The GPS running all day doesn't draw that much power.

Even a group 24 won't feel it.

i did install an extra battery to run all my accessories too

Not because my 2 fishfinder/GPS were draining a lot. I just run a lot of stuff and didn't want to be without  starting power. summer tournaments when you have pumps running all day will kill a battery,

( I know, you can put the pumps on a timer. I used to do that. But I fish Lake Erie alot and  had too many fish die in the livewells in the summer. Started running my recirc pumps all day as soon as a fish is put in the well, and have not had one die since)

I run a group 24 duralast,  small and cheep $55.  The GPS and recirculation pumps run all day

i run:

2 fishfinder/GPS

2 live well pump-in pumps (500gph each)

2 reciculation pumps (500gph each)

2 bilge pumps (one auto & one manual, both 750gph)

stereo

marine radio

running lights

int lights