How much volts does a 2005 90HP ELPTO provide to charge the batteries? I'm looking at getting two Blue Top Optima batteries. These are the specs:<br /><br />Blue Top Type: D34M / D31M<br />These batteries are dual purpose. They are designed for engine starting and deep cycling applications and for use in boats with large accessory loads.<br /><br />Recommended charging information: <br /><br />Alternator:<br />13.65 to 15.0 volts, no amperage limit.
