Marine Battery Needed for Cranking/Livescope

X2 AGM = Comes with a 4-year free replacement warranty.

DH AGM = 1 YR REPLACEMENT IF DEFECTIVE

AGM from Sams only lasted a year and a few months for me. I went to academy and got an interstate for cheap. I think I'm done with high end batteries. Optima before that lasted a little longer but it's now 3x the cost.

Thanks ya'll, just gonna bite the bullet and grab the X2 due to the 4 year warranty. With how much I fish it could end up paying for itself with that kind of warranty

Man, you can get a 125AH Ionic for not much more. No way I would buy an AGM at that price. The one I paid a lot for from Basscat left me stranded within a year.

A friend of mine got a lithium and put all of his electronics on that single battery.

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25AH Ionic for not much more.

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This. I switched my trolling batteries to Ionic 50AH's and they've been the tits. 11 year warranty and were cheaper than replacing lead acid / agm over the course of that 11 years.

I intend to switch my cranking / auxiliary battery when it's time also.

One thing to note is if you do go with lithium / LiFePo4, unless you have a 14.6v charger, you will need to get a new charger to get them to full capacity.

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Mercury being so negative about people using lithium as cranking batteries. If I had the money to spend it'd be worth the $$$ but my luck I'd screw up the motor and lord knows how long it'd take to repair right now

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I read about this stuff daily on a couple of boat specific forums. I have seen exactly one issue reported, and that engine had 645 hours and the battery manufacturer admitted a BMS failure. Here's the latest on Merc, and I am running Lithium on a new 4 stroke:

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As of 9/26/2022, Mercury has issued Service Bulletin 2022-19 stating that the listed engines will be permitted to use a Lithium Iron Phosphate Battery that is designed for engine cranking, as long as it meets the listed specifications:

-2.1L 75-115hp Fourstroke, ProXS and SeaPro Models
-3.0L 150hp Fourstroke, ProXS and SeaPro
-4.6L V8 and 3.4L V6 175-300hp Fourstroke, ProXS, SeaPro and Verado Models
-2.6L L6 200-400 Pro and Verado Models
-7.6L V12 500-600hp SeaPro and Verado Models.
-NO other engines approved at this time.

Minimum Specs Required:

-Chemistry/Format: Lithium IRON Phosphate designed for MARINE CRANKING USE.
-Minimum Cranking Amps: 800A for 8 second minimum @ 20 Degrees F
-Peak Charge Acceptance: 165A at 20-130 degrees F for one minute
-Max Charge Alternator Size: 150A at 20-130 degrees F
-Max Charge Voltage/Alternator Output: 14.8V
-Reserve Capacity (RC25 @ 80F): 135 Minutes
-Ingress Protection (IP rating): IP67 or greater.

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Yamaha will tell you the same thing.

Lithium batteries tend to have failures that send excess voltage through the engine harness and fry the electronics etc. if this happens you’ll be buying lots of expensive parts and not covered by warranty.

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All cranking lithium batteries are LiFepo4.

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Fair enough, I was more pointing to the question of what chemistry Mercury was balking at, since they now allow LiFePo4.

I will tell you this about battery issues. If you ever want to be free of battery issues, get a power pole charge unit.

I have competitive bass fished for 40 years. I have full time guided for 25 years. I have owned 12 bRand new boats. I just switched to salt water and have a new 25 foot center console.

Getting a power pole charge unit is probably the best thing I have ever added to my boat.

I have 2 lead acid 31 series batteries in parallel for my engine and electronics and 2 40ah 36v lithium batteries in parallel for my trolling motor. All charged by my power pole charge unit and I never even have to plug it in after my trips.

Basic battery issues are over.