I always pick a battery with the best warranty and from a place that the battery is stamped with that store brand and the date, if they require to you keep your receipt then go some place else, if the warranty doesn't cover full replacement then avoid it.
As far as deep cycle batteries go, they have a rated discharge rate and a normal car starter is a higher load then alot of deep cycle batteries can handle, thus you can kill a deep cycle battery by using it as a starting battery if it's not rated for the load.
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