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Lithium-ion batteries are much less affected by environmental and discharge factors than their lead-acid counterparts. This makes the life cycle estimates much more accurate. This means that you can use 100% of the capacity without excessively damaging the battery. However, some manufacturers, like Dragonfly Energy and our consumer brand Battle Born Batteries, rate their batteries with a 100% depth of discharge. In most cases, lithium battery manufacturers limit the depth of discharge to 80%. Lithium-Ion Battery Life Cycleĭragonfly Energy lithium-ion batteries have expected life cycle ratings between 3,000-5,000 cycles for a heavily used battery. Light use can well exceed this rating. Each manufacturer will also provide the depth of discharge limit to achieve their life cycle rating. The life cycle of a battery depends on the type of battery and how you use it. At Dragonfly Energy, we cycle every battery cell to ensure capacity and safety. Your battery manufacturer should be able to provide you with the correct Peukert constant for your battery. The Peukert constant is specific to your battery and allows the battery monitor to accurately calculate the discharge depth. However, the simple summary is that different batteries have different discharge capacities based on how rapidly its discharged. This change in capacity is calculated with the Peukert constant. To properly calculate the depth of discharge and remaining battery capacity, you need to enter the proper Peukert constant into the battery monitor.Īn in-depth discussion of the Peukert constant and Peukert’s Law is beyond the scope of this article. You should always use a battery monitor like the Victron BMV-700 to determine the depth of discharge of your battery. Even at “full” charge, we’re starting with a 20% depth of discharge. If we refer back to our definition of a battery life cycle, we reach the life cycle limit if we cannot charge that same battery past 80 Ah.
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For example, a brand new battery with a 100 Ah rating discharged down to 60 Ah would have a 40% depth of discharge for that cycle. Depth of discharge is the percentage of the battery capacity that has been used relative to the total capacity. How Is The Depth Of Discharge Determined?Īnother way to understand battery capacity is in terms of the depth of discharge. There is not a standard test, but a general rule of thumb is that the life cycle of the battery is the number of cycles you get before you cannot recharge your battery to more than 80% of the original capacity. Of course, this doesn’t mean your battery has reached the end of its life.Įach manufacturer provides data on acceptable performance and capacity reduction before determining the life cycle is reached. In reality, the first time you discharge your battery, it will not recharge to its full capacity.
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The life cycle of a battery is the number of charge and discharge cycles that it can complete before losing performance. What Is A Battery Life Cycle?Īs you use your battery and recharge it, it slowly loses the ability to return to its original capacity. Many factors influence the life cycle of a battery, but before we get into them, we’re going to cover what exactly a battery life cycle is and how to calculate it. Whether you’ve had your deep-cycle battery for years or you just bought a brand new one, knowing how long it should last is important. You definitely don’t want to get in the middle of nowhere with a dead battery.