Lawn mower battery for 15 hp motor?

In a nut shell has any one done this? I added two anchor mates to a 15 foot boat with Terrova trolling motor, thinking it might be a good idea to add a battery for just starting motor. Trying to save a little space and weight. Motor has pull start but I really don't want to use it. I have a 62 year old back that has a lot of miles on it.Any one know how big the draw is from Mikoda 40 deck hand anchor mates?

we used a lawn mower battery on a old 9.8 merc when we fished the river. It worked fine.

I used one (Walmart) for my 15hp Suzuki. I had another separate small battery for electronics. My lawn more has more hp than my outboard.

I used one for years on a 50 Nissan with tilt and trim. Ran my lights and graph too. No problems.


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Thanks, If I have issues with power, I know what to do.