If the vehicle sits for a week or more at a time without being used then it will for sure help make it start easier and once it starts the engine will have less of a load on it because the battery is nearly full (aside from the amount the starter used), lead acid batteries also last longer if they spend more of their life charged, so the biggest change you might see is that your battery life could go from lasting 3-5 years to lasting 10-15.
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