reply to melissaburge
Re: Lawn mower battery years back when i had an ATV, i used one of these from walmart.
i never had a problem starting my ATV in single digit weather. it has an automatic charging circuit, so it maintains the battery at peak voltage so it never goes dead. they are well worth the money.
i also bought my atv battery at walmart. you might want to look into getting one for your application at wallyworld. you can check the electrolyte level and top it off if needed. that is one of the biggest killers with all batteries.