Battery Question

ANyone ever use a riding lawn mower battery to start a small outboard?

I've got a bad cell in my mini-deep cycle that I use to start my 18 hp 2 stroke. After sitting for a week or two, it wont hold enough charge to start the motor. So I need to replace it soon.
I use it to start the motor as well as to run my lights, FF and spotlight. Spotlight rarely gets used when the motor is not running. Lights are on for 1 hour max, mostly when the motor is running, after that the boat is in the duck blind.

Size & wiehgt-wize, this mini-deep cycle battery is the same size as the riding mower batteries, just has different amp rating, reserve, etc. But the mower battery is 1/2 the price.
Given how I use it, do you think it will hold up to boat use?
Thanks,

You have a pull start also?
A spotlight for an hour is pretty long.
Your looking for cranking amps to start the motor.How many on the lawn mower battery?
You might want a seperate battery for the spotlight,if you don't like pulling

Nope, running/anchor lights for an hour, spotlight for maybe 10 minutes total, but never more than a minute or so at a time.
I do have pull start as well.
Not sure what cranking amps my 18 needs, will check on that.