How long will a marine battery hold a charge?

Catharine Renner asked a question: How long will a marine battery hold a charge?
Asked By: Catharine Renner
Date created: Wed, Feb 24, 2021 7:32 AM
Date updated: Wed, Jun 29, 2022 12:37 PM


Top best answers to the question «How long will a marine battery hold a charge»

Most marine batteries last anywhere from 2 to 5 years depending on the level of care you give them.


Those who are looking for an answer to the question «How long will a marine battery hold a charge?» often ask the following questions:

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9 other answers

A good marine Lithium battery when stored at room temp can last 10-12 years when stored with a full charge! They are amazing.

The common lifespan of a deep cycle battery (according to some internet sources) is: 1 to 6 years for Marine deep cycle battery. 2 to 5 years for Gel deep cycle battery. 4 to 8 years for AGM (Absorbed Glass Mat) deep cycle battery. 4 to 8 years for Flooded deep cycle battery. 4 to 8 years for L-16 type deep cycle battery.

The average car will run down the battery in about 3 weeks due to the radio preset storage, the clock, and the alarm system. The car is not really off unless that battery is disconnected. A lot of boats have isolation switches to disconnect the batteries from any loads.

Deep cycle batteries may be charged using the same steps recommended for other marine batteries. The one thing to keep in mind is that they must be recharged within 24 hours. Do not allow deep cycle batteries to become depleted or sit uncharged. It will decrease the quality and longevity of the battery.

Re: How long will a 12v battery hold its charge? Even a small group 24 battery would run your GPS for 2 weeks. The VHF will draw about 3 amps Max in the 25 Watt mode so if your talking all day it should still last at least a day. In the one watt mode or if you talk very little I would expect a week.

That means your battery will hold energy for longer until you are ready to use it. It also makes it an optimal battery for emergencies, or back up power for when the lights go out. As a battery ages the self discharge rate will increase, after 4-5 years of use you may find your battery has a self discharge rate of 10-30% a month.

Once fully charged, marine batteries should be held at a considerably lower voltage to maintain their charge - typically 13.2 to 13.4 volts. Higher voltage levels will "gas" the battery and boil off electrolyte, again shortening battery life.

The batteries lose the ability to retain a charge over time. Before they die, most of these batteries have a life span of around 7,000 charging cycles and then the battery has to be replaced by another lithium ion battery. However, researchers are working to make lithium ion battery long lasting which will be happen in couple of years.

Dual-purpose batteries are also very common. Sometimes referred to as just marine batteries, they provide a balance between starting and deep cycle use. A cranking battery repeatedly used for deep cycling can degrade in a matter of weeks, and vice versa, so choose the right one.

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