Considering a switch to a lithium battery for my starting / electronics. Have 4 graph's total, one is live scope. Any advise would be appreciated

What 4 graphs? There's a huge amp draw difference between a 9" and 16" screen.
Me personally, I'm using an Ionic 125a on a SHO250 with 4 12" graphs, LS, poles, pumps, lights, ect. End of a tournament day without much running of the big motor I'm never below mid 60% battery power.

I am using the Ionic 125 AH. I can run 2 Solix 15’s, 1 Garmin 126 SV, & LVS34, for 12 hours before my voltage drops below 13 volts. It is a great battery

I run four graphs ,360,ffs,2 5 port hubs on a 125ah will last all day, at rnd of a long day 10 hours or more it will be at 48 percent.
cranking battery is stand alone
solix 15 12 and 10
helix 15

Most motor manufacturers do not suggest using lithium for the starting battery. I would check with your motor manufacturer.
You need to run the calcs to see what amps your units are pulling, then can figure what battery is best for your situation.

Mercury has announced in Dec 2022 Lithiums are permitted see service bulletin.

as of 12/23/2022, Mercury has issued Service Bulletin 2022-19 and SHS 2022-21 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.
-ALL MERCURY RACING OUTBOARD ENGINES (Current Production models)

Mercury only did it because Brunswick Marine (their parent company) bought ReLion batteries but did at least have minimal requirements. Other manufacturers haven’t yet because there are so many different battery manufacturers and each has a different BMS.

I'm about to buy a new boat and don't know much about the newer Ni-Cad batteries. I want to use them for everything but I'm unsure about the cranking battery.
Does Mercury warranty their engine if used with the Ni-Cad batteries for cranking?
Kinda important
It would be the 250 HP Merc 4 stroke.
Some new boat salespeople are sayings that it's okay to use them with the Merc engine and some arn't

I have 3 HB Helix 12 inch & 1 Garmin 12 inch 2012 Yamaha SHO
So am I understanding correctly? If I add a lithium for electronics I will be adding a 5th battery ? 1 starting 1 electronics 3 Trolling motor ?

I have the same setup and am using an Ionic 125a for both. No need for a 5th battery

This video walks through the math needed to determine how much capacity you need for the electronics side.

He is not kidding, I helped him with some wiring and he doesn't have to worry about power..


My .02 is keep the starting battery the same and change the TM batteries to lithium, with a dedicated lithium just for electronics. It will change your life. I cover water with my TM and on some days longer than 16hrs, the batteries will be on 40%. I am not kidding, if you fish allot you will be very surprised. If you fish a couple times a month, you will not prob see a big difference.

I use 2x 100ah for the TM
1x 100ah for electronics
1x Walmart wet cell for starting/bilge/lights

3 50 AH Ionics for TM $349 ea

1 125AH for cranking and graphs is going to work just fine $799

In stock
If you want a separate battery for your LS I have that too

Bring your old lead acid batteries in for core credit against your lithium if you like

In Wylie

Has anyone heard of any horror stories from a lithium ionics cranking 125ah powering a Yamaha SHO for cranking purposes?
I’m running ionics 125 cranker and three 50ah.
On a SHO 225 with two 12s a 10 and lv 34.
as far as power I’ve never ran it below 70% all day tournament. Im Leary about the cranking battery because it’s not approved by Yamaha but so far no issues. I’ve thinking about adding a regular lead acid cranker for the peace of mind but idk.

Yamaha doesnt have any approved products outside of their own brands. I've sold thousands and not one issue happed because of it.. The issue with yamaha and mercury and why they were against lithium so much was people were using the cheap amazon batteries that dont have properly programmed bms add in that they were lithium ion and it was a problem waiting to happen. We now use lithium iron phosphate which is a much safer battery chemistry, correctly programmed bms that provides that short burst of power needed.

Ive spent time with the owner of Zpro another brand I sell to understand and educate myself on lithium and on what makes a good quality battery.