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Need cranking motor for Mercury 150 HP 4 Stroke
Posted on 6/16/26 at 5:03 pm
Posted on 6/16/26 at 5:03 pm
What's your recommendation for a cranking motor battery for a Mercury 150 HP 4 Stroke? I can't find a manufacturer recommendation for CCA or MCA.
Google says :For a Mercury 150 hp 4-stroke outboard, you need a 12-volt marine cranking battery with a minimum of 800 CCA (Cold Cranking Amps) or 1000 MCA (Marine Cranking Amps)
Seems large?
Also, I'm installing a second battery to power my electronics (GPS, two live-wells, radio). No trolling motor yet. Maybe in the future.
Battery recommendation for electronics?
Thanks,
Google says :For a Mercury 150 hp 4-stroke outboard, you need a 12-volt marine cranking battery with a minimum of 800 CCA (Cold Cranking Amps) or 1000 MCA (Marine Cranking Amps)
Seems large?
Also, I'm installing a second battery to power my electronics (GPS, two live-wells, radio). No trolling motor yet. Maybe in the future.
Battery recommendation for electronics?
Thanks,
8
Posted on 6/16/26 at 5:07 pm to bagboy333
One of the things I had to learn about larger outboards was the large amount of power it takes to crank them. I’ve had situations where I could turn the key over, get tone and all my dashboard gauges and lights work but the battery not have enough juice to turn the engine over.
Don’t under power your outboard battery or you’ll wind up stuck somewhere.
I would suggest a minimum of 840 CCA
Don’t under power your outboard battery or you’ll wind up stuck somewhere.
I would suggest a minimum of 840 CCA
This post was edited on 6/16/26 at 5:09 pm
Posted on 6/16/26 at 5:19 pm to bagboy333
1000 CCA.
Posted on 6/16/26 at 5:44 pm to bagboy333
I have to get a new crank/house battery. Mine needs 750 cold cranking amps which is around a group 24 size. Likely going to step up to Group 27 AGM because same battery also runs GPS and Power Pole. Thinking of biting the bullet and go with X2 power based on research.
Mercury requires high cranking amps due to the alternator output
Mercury requires high cranking amps due to the alternator output
This post was edited on 6/16/26 at 5:45 pm
Posted on 6/17/26 at 7:35 pm to bagboy333
quote:
hp 4-stroke outboard, you need a 12-volt marine cranking battery with a minimum of 800 CCA (Cold Cranking Amps) or 1000 MCA (Marine Cranking Amps)
Yes this is correct. Just replaced mine Friday night. I bought a standard lead one at Walmart for 100. Although I think it’s recommended to go with an agm, I didn’t want to pay for one. I don’t have much electronics, so I am good with a regular battery.
Posted on 6/17/26 at 8:04 pm to bagboy333
I have a 200 4 stroke. I switched to an Ionic lithium and couldn't be happier. I power all electronics and my power pole and end up over 95% charge at the end of the day.
Posted on 6/18/26 at 9:04 am to bagboy333
I ran this same engine for five years. I ran a deep cycle 1000CCA battery with no issues. Same battery ran my GPS and power pole.
Posted on 6/18/26 at 6:25 pm to bagboy333
I got to WalMart and get a group 27 Marine Battery. Cranked my Yamaha 250 just fine.
Posted on 6/18/26 at 6:49 pm to bagboy333
Gotta remember those are really high compression motors, that’s one of the reasons that those small engines crank out that much HP and to turn over a high compression motor you really need some amps
Posted on 6/20/26 at 8:33 am to AlxTgr
Mines a 150 but same for me with the 125 Ionic lithium going on 3 years, zero issues.
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