Discharge of Marine Deep Cycle Batteries

Discharge of Marine Deep Cycle Batteries: 6 Unraveling the Mysterious Facts

The discharge of marine deep cycle batteries, just like every other item, do suffer from the loss of energy and the risks of disorders. This phenomenon is called entropy and it definitely affects the availability of the charges that are stored in the system. It is for this reason that it is no surprise that the deep-cycle marine batteries too do lose charge, but why do marine deep-cycle batteries, When Not In Use??

Listed and explained below are some of the arguments that underlie this particular phenomenon:

Reference  Read: Replacing Process Of Marine Deep Cycle Battery

Table of Contents

Discharge of Marine Deep Cycle Batteries

Passage of Time

With the passage of time, all batteries lose their charge even when they are not in use. This is primarily due to the loss of the chemical agents mainly due to the diminished potency of these chemicals in the first place.

The lead-acid batteries which are the main materials that constitute the deep-cycle batteries are the worst affected by this phenomenon.



From time to time, all batteries do suffer from sulfation. This is basically the loss of the ability of a battery to accept charges or deliver energy as a result of the accumulation of deposits.

These deposits arise from the soft lead sulfates which generally form on the plates of the batteries. It occurs mainly when the battery is left untouched for durations longer than 3 days.

Faulty Plates

Just like every other part of the battery, the plates of a battery are also prone to damage and malfunctions of whichever kind. This malfunction may often arise due to a number of factors.

These include physical damages, deterioration by reason of extended use, and the accumulation of deposits. Such faults have the tendency to deplete the charges and weaken their potency.

Reduced Surface Area for Chemical Reactions

Most modern deep-cycle batteries come along with thicker plates. These plates have limited surface areas which are necessary for chemical reactions to occur.

With diminished surface area also comes faster rates of the depletion of the electrical charges. It is for this reason that the batteries lose much of their charge when they are left to rest for a longer amount of time.

Reduced Surface Area for Chemical Reactions

Trickling of Chemicals

In case the battery has any perforations, it will normally lose some of the chemicals by reason of the trickling of the liquids inside them. Such trickles will definitely reduce the number of chemicals available for charging at any given time.

The end result is a loss of potency and charges. It is thus necessary to seal such loopholes and store the batteries in secure places at any given time.

Also Read: Top Ultrasonic Cleaners

Reverse Discharge

Lastly, comes the reverse discharge. This phenomenon arises mainly when the battery switches from the conducting to the blocking state. The process entails the use of some stored charge before the diodes may block the reverse currents.

Most modern batteries do contain the silicone diode which is used to block this particular phenomenon. This notwithstanding, some amount of charge is dissipated in the process and contributes to a significant loss of charge in the long run.


In conclusion, it is indeed possible for the marine deep-cycle battery to discharge when it is not in use. Some of the factors that cause this particular issue that largely avoidable. Quite a number though are inevitable. You ought to put in measures to mitigate or slow down their impacts nonetheless. The ball is squarely in your court. It is up to you to make substantive arrangements to have the job done effectively.

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