Check for voltage. If it is lower than 12.3, put it on a trickle charger or battery maintainer until it reads 12.8 or so. Just as a "I know it's right" thing.

Generally when you get a new battery from a store they are usually only around 80% charged.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now