Members' Online Book: Battery Installation & Maintenance, Chapter 12 of 18

What Battery Type Should You Buy?

Battery Shopping

So far, in this Online Book, we have written about properly charging your batteries. But what battery type should you buy? Liquid filled, Gel, or AGM?

The first thing to understand is that all three types are lead-acid batteries and use the same electrolyte and are subject to the same vulnerability to failure from sulfating. So there is no best type. Rather the best battery for you depends on your usage profile. Let’s look at the three types and their different advantages and disadvantages in cruising yacht use.

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Meet the Author


John was born and brought up in Bermuda and started sailing as a child, racing locally and offshore before turning to cruising. He has sailed over 100,000 miles, most of it on his McCurdy & Rhodes 56, Morgan's Cloud, including eight ocean races to Bermuda, culminating in winning his class twice in the Newport Bermuda Race. He has skippered a series of voyages in the North Atlantic, the majority of which have been to the high latitudes. John has been helping others go voyaging by sharing his experience for twenty years, first in yachting magazines and, for the last 12 years, as co-editor/publisher of AAC.

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