Low Maintenance and Maintenance Free Batteries

So-called low maintenance batteries are not all the same! There is a vast difference from one manufacturer to another.

While they are designed to go further without adding water, water can be added and the battery cell condition can be checked. This is not possible with most maintenance free batteries.

With maintenance free, if the electrical system malfunctions, the electrolyte may go dry, and there is no way of replacing it! There is no way of checking the electrolyte level, nor is there a reliable way of determining the state of charge of the battery. Only an experienced technician can determine the state of charge with a high quality voltmeter. Yes, you will have the first of trouble when the battery starts to fail.

Okay if you are alongside the dock, but tragic if you are still at sea or beginning a planned weekend.

Many maintenance free batteries will not accept a charge if totally discharged as they contain calcium oxide between the grid and the active material. The calcium oxide has a high electrical resistance and confuses the alternator or charger into thinking the battery is charged!

Good marine practice dictates periodically checking the battery (or batteries) before putting out to sea.

Remember: When your batteries fail, the engine won't start, electronic equipment won't operate, lights won't light,and electrical accessories won't operate!

Regular or low maintenance batteries are a must for marine equipment. The condition of the battery can easily be checked by taking hydrometer readings of each cell. The hydrometer readings will reveal the state of charge as well as possible trouble. Impending failure can be avoided by regularly checking the battery condition with a hydrometer.

Every boat owner should familiarize himself / herself with the use of a good hydrometer and have one on board at all times. The other alternative is to wait until the battery fails, then you will know the results of using equipment you can't check!!