The best choices will be microprocessor-controlled and have specific settings for AGM batteries (as opposed to a non-specific "gel/AGM" setting). While OPTIMA offers battery chargers and maintainers designed to automatically and properly-maintain all 12-volt, lead-acid batteries, there are plenty of other options in the marketplace. All other OPTIMA BLUETOP batteries will measure at least 13.0-13.2 volts when fully-charged. Most batteries are not fully-charged until they measure at least 12.6 volts, including the 34M OPTIMA BLUETOP starting battery. That makes regular use of a quality battery maintenance device a key to making a marine battery last as long as possible. Whenever any battery is discharged below 12.4 volts and is left sitting in that state, sulfation begins forming in the plates, which diminishes both capacity and lifespan. Batteries stored in extreme temperatures, both hot and cold, will not last as long as batteries stored in moderate temperatures. Proper voltage maintenance is the key to maximizing battery performance and lifespan and the vast majority of marine batteries spend most of their existence not being used, so how they are maintained, which is how they will spend most of their existence becomes very important. Once you've identified the best battery for your application, your attention should turn to how you maintain that battery. You can still use the other good batteries in some other application, just not in one, where they are connected to any battery that differs in age, size or type. That means if one marine battery in a bank of two or more goes bad, you need to replace all the batteries in that bank.
Optima marine battery series#
If you are running more than one marine battery in an application, whether it is engine starting or some other use, all batteries connected in series or parallel applications should be identical in age, size and type. In simple terms, that means if your boat can accommodate larger marine batteries, you may want to spend a little more money up front and buy a larger marine battery with more reserve capacity, maybe even the biggest you can fit in the space available. You can get into the weeds on other websites as it relates to Peukert's law, but the Cliff Notes will tell you the more-deeply you discharge or cycle a battery, the fewer cycles you will get out of it. You should also make sure your marine batteries are appropriately-sized for their application. Deep-cycle applications can include trolling motor batteries, accessory batteries or house batteries. If your marine battery is going into a deep-cycle application, be sure it is designed for deep-cycle use (some batteries are designed only for engine starting). To explain further, we'll start with properly-selecting a battery. So what do we mean by that? You can buy a battery that boasts a very long service life, but if it's not the right battery for the application and/or it isn't properly-maintained, it won't last very long. The reason is because there are so many different marine applications for batteries, that the most-honest answer anyone can give you to that question is that a proper marine battery that is well-maintained will last the longest. It's an obvious question to ask which marine battery lasts the longest, but the answer isn't so obvious.
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