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Minimum requirements for a 2003 150 4 stroke...

512 Cold Cranking Amps
675 Marine Cranking Amps
182 Minutes Reserve Capacity

Those are the minimums recommended, I'd go for a stronger battery.

When I played offshore there were always 2 batteries under the console,
rigged to a "1-off-2-both" battery switch. That way if the livewell killed one battery
it was a simple thing to switch to the second to get started and home.
 

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I used sealed marine batteries from a local auto parts store.
Not any particular brand, just what was on the shelf.
Kept the receipts so that when a battery no longer accepted a charge
I could receive the pro-rated credit towards the next battery.
 
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