I maintain a fleet of boats and have noticed that the boats with alternators on the engines do not get the same life out of batteries as the ones without alternators. All batteries have wall mount chargers. The wall mount chargers have bulk and float charging modes, some had absorption cycles too but we don't have any more of those chargers. Do alternators run in as only bulk chargers all of the time and does that shorten batter life on engines that rack up a lot of hours (3000-4000 hours a year)?
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