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JohnHunts
JohnHunts

Posted: Tue Jul 12, 2011 4:44pm

Post Subject: Accommodation Batteries

My 2 accommodation batteries have lasted 2 years 3 months which doesn't seem very long. Is this normal life span ?

Tony-B
Tony-B

Posted: Tue Jul 12, 2011 7:28pm

Post Subject: Accommodation Batteries

Their lifespan is anything between less than six months and over 15 years. This depends upon the type of battery, the way you use it, the way you charge it, your boat's electrical system and probably much more. You give no useful information about this so I can not even guess at an "expected" life. We have recently had a major engine mariniser supplying alternators that tend to destroy older battery technologies unless an often unrealistic battery maintenance regime is followed. A typical holiday boat with relatively cheap open cell batteries and only engine charging may expect between two and four years life from their batteries providing their use, bank size and charging regime are tolerably well matched. You really need to work through the power audit and charging calculations you will find on tb-training.co.uk, then you will have a better idea about how to extend their life. Do not spend any money on "gizmos" or expensive batteries until you have done this. Unless you have a source of lowish current but long term charging (mains charger or reasonably sized solar) you will probably kill the batteries by leaving them only partially charged (sulphation) so it is no use buying expensive batteries that promise longer life unless you can frequently recharge to almost 100%. This may take 12 hours or more using just the engine. Most boaters without such facilities will rarely charge to much more than 80% unless they are into very long cruising days. Come back if you want more information.

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