Lithium Batteries?

**DockShootinJack** · 10-14-2021, 07:38 AM

Originally Posted by Atimm693

What you are checking with that tester is essentially the cranking amps, which is not what you are looking for in a deep cycle battery. Reserve capacity is what matters in your situation. To measure that, you would need to place a specific amp load on the battery, and see how long it takes for the battery to discharge. Then compare that to the amp-hour rating of the battery. A 10 amp load should go for 10 hours or so on a 100ah battery (10x10=100). A battery can provide the cranking amps but not have the reserve capacity and vice versa.

In your case I think it would be wise to run a separate house battery for all of your electronics and pumps, and then a cheap lead acid starting battery that only cranks the motor. If you have an outboard with a pretty good charging system, you could then use an isolator to charge the house battery on the fly, or rely on your onboard charger between trips.

Those 10/12" units plus your LS are drawing a lot of power.

Some of the newer outboards will ready charge a battery quickly

**Atimm693** · 10-14-2021, 10:52 AM

Originally Posted by DockShootinJack

Some of the newer outboards will ready charge a battery quickly

Oh yeah, I have a 2010 90hp Merc, it has a full fledged 50 amp alternator, belt drive and all. Sure beats the piddly 10 amp stators that we used to have.

**FurFlyin** · 10-14-2021, 11:38 AM

Originally Posted by tlefire

Yes. 2 for the troller and a 50ah for electronics.

but not for cranking?

**FurFlyin** · 10-14-2021, 11:41 AM

Originally Posted by Atimm693

Oh yeah, I have a 2010 90hp Merc, it has a full fledged 50 amp alternator, belt drive and all. Sure beats the piddly 10 amp stators that we used to have.

I’ve got a Yamaha 4 stroke and it rapidly charges the cranking battery

**tlefire** · 10-14-2021, 01:17 PM

Originally Posted by FurFlyin

but not for cranking?

I don't have your kind of money...lol

When my cranking battery goes bad, I'll have one.

**DockShootinJack** · 10-14-2021, 01:33 PM

They are pretty pricey

**"G"** · 10-14-2021, 03:07 PM

Originally Posted by DockShootinJack

They are pretty pricey

If they last as long as some say they will....you would be saving money

**DockShootinJack** · 10-14-2021, 04:00 PM

Originally Posted by "G"

If they last as long as some say they will....you would be saving money

Very true. I am curious about how they are affected by cold temps

**SuperDave336** · 10-14-2021, 04:03 PM

I think they do very well. Seems Amped Outdoors has a big ice fishing following. Been told better than lead acid in cold.

**DockShootinJack** · 10-14-2021, 04:14 PM

I need to do some research into them some more. I had looked into building a battery from cells.

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