Battery For Trolling/agm?

[jignfule]

I have a light weight pond boat and a small pontoon boat. I use a size 27 battery and at the end of most days it reads 60-70% still left, according to my battery meter. I am thinking of trying a size 22 AGM battery because of the lighter weight. My question is will the 22 series be addiquit?

[james 14]

Most likely not.

 

What is the weight difference?

 

The deeper you discharge a battery the sooner you'll have to replace it. Rather than looking at a battery tester you should look at a voltmeter and when you drop below 12.4 volts you're doing damage to the battery.

[jignfule]

Most likely not.

 

What is the weight difference?

 

The deeper you discharge a battery the sooner you'll have to replace it. Rather than looking at a battery tester you should look at a voltmeter and when you drop below 12.4 volts you're doing damage to the battery.

Weight difference 58# vs. 38#

Also I heard that you can deep discharge a AGM battery with less damage then a regular deep cell.

[james 14]

20# isn't enough of a weight difference to risk what will likely be a situation where you run out of power and wear the battery down faster. AND you'll likely pay way more for that AGM.

[BKeith]

Well, for the "most" days you come in and still have 60% - 70% charge left, the smaller battery would work just fine.  My question would be, what about those other days when you use more than your normal 30% - 40%.

 

As for running an AGM down further than a flooded cell battery, no, you should not.  You should never run any battery down below 20% charge,  Doing so shortens the life.  In the ideal world, you don't want to run one down below 50%.   With that said though, a proper maintained AGM is stll going to give you several hundred cycles, even run all the way down to 20%.  Meaning it will probably die from non use before you get all the goody out of it's life cycles because you are still talking several years.   

 

I agree with you on dropping the weight.  When I'm in south Texas visiting my son, we go a lot of times just for a couple of hours in the morning and evening with the jon boat, thrown in the back of his truck.  I bought a small AGM just for those times because when you slinging a 60 - 70 pound flooded cell around, it gets old real quick.