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Deep Cycle Battery Life

September 11, 2015

How long should your batteries last?  This depends on a lot of factors. How often are you disharging the batteries, and how deeply? How often are you recharging them? How well are they being maintained? All of these questions will play a factor in the lifespan of your battery, as will the phase that it is in. This article will briefly explain the phases of a deep cycle batteries so that you can better understand the how they play a part in the capacity and lifespan of your battery. 

Deep cycle batteries go through three phases; Formatting, Peak or Prime, and Decline.

 The first phase, called formatting, is the phase the battery in which you will recieve the battery from the store. For the first twenty to fifty cycles, the lead plates inside the new battery will still be absorbing the electrolyte inside, and so the battery will not be at full capacity. 

The second phase is the peak or prime of the battery's life, which can last as long as 200 cycles. This phase is the "sweet spot", where the battery is working at it's peak capacity.

The final phase of battery life is called the decline. Over time, the battery's run time will slowly decrease. It is recommended that deep cycle batteries be replaced when they are around 70% of their peak capacity. After this mark, batteries begin to fade quickly and can become unreliable.


Many of the numbers and graphics for this article came from the following sites:

Battery University

UPS Battery Center