Do you also feel that deep cycle batteries are closely related to our work and daily life? In fact, understanding their expected lifespan and how to extend it is quite necessary. This knowledge can help us make better decisions when choosing deep cycle batteries, enhance their efficiency during use, and improve system reliability, thereby enhancing our overall user experience. Let’s dive into more details together.

What Is Deep Cycle Battery?

A deep cycle battery refers to a battery that can undergo deep charge and discharge cycles, commonly used in applications requiring long-term stable power. If you have used solar energy storage systems, uninterruptible power supplies (UPS), RVs, campers, trolling motors, or golf carts, you would know that their operating times are generally long and require stable power to maintain smooth operation. The characteristics of deep cycle batteries perfectly meet these needs. In contrast, starter batteries are designed to provide a burst of high current to start engines.

How Long Does Deep Cycle Battery Last?

Deep cycle batteries can be categorized into the following types: flooded lead-acid batteries, gel batteries, absorbed glass mat (AGM) batteries, and lithium-ion/lithium iron phosphate (LiFePO4) batteries. The lifespan of these batteries varies.

Flooded Lead-Acid Batteries

Flooded lead-acid batteries typically have a lifespan of 3-5 years and can endure between 200-1000 charge-discharge cycles. Their depth of discharge is approximately 50%, making them the shortest-lived type of deep cycle battery. You may need to replace them frequently.

GEL Battery

GEL batteries are valve-regulated lead-acid batteries with a slightly longer lifespan than flooded lead-acid batteries. They typically last 4-7 years and can complete 500-1000 charge-discharge cycles.

Absorbed Glass Mat (AGM) Battery

AGM batteries, like gel batteries, are valve-regulated lead-acid batteries. Their lifespan and cycle count values are essentially the same, typically lasting 4-7 years and completing 500-1000 charge-discharge cycles.

Lithium-Ion/Lithium Iron Phosphate (LiFePO4) Battery

Lithium-ion or lithium iron phosphate batteries are new-generation energy batteries. They typically last 8-15 years and can endure 2000-5000 charge-discharge cycles, with a depth of discharge between 80% and 100%. Their lifespan is 5-10 times longer than that of lead-acid batteries, making them the longest-lasting type of deep cycle battery. The 12V 100Ah LiFePO4 battery from Delong is designed to last 12 years.

Factors Affecting The Life Of Deep Cycle Batteries

You might have this concern: why is the actual lifespan of a deep cycle battery different from what the manufacturer indicates? This is because, during actual use, there are various factors that can directly or indirectly affect the battery’s lifespan. For example:


For lead-acid batteries, regular maintenance is essential. For example, flooded lead-acid batteries require periodic water refilling to prevent the electrodes from being exposed due to the loss of water in the electrolyte, which can damage the battery. Additionally, if there is corrosion on the terminals of open lead-acid batteries, it can affect the battery’s connection and performance. Therefore, regular cleaning is necessary to ensure the battery operates properly.


When batteries operate in high-temperature environments, the internal chemical reactions accelerate, leading to battery aging. Conversely, excessively low temperatures can reduce the battery’s capacity and performance. Therefore, it is important to consider the environmental temperature when using and storing batteries.

Operating Environment

In addition to temperature, the area where the battery is used needs to have good ventilation. For instance, lead-acid batteries produce hydrogen and oxygen during the charging process. If these gases reach a certain concentration, they can pose significant dangers, so timely ventilation is necessary.

Battery Quality

The materials and manufacturing processes used in the battery also affect its lifespan. High-quality batteries are more durable and have a longer service life.

How To Extend The Lifespan Of Deep Cycle Batteries?

In fact, the above factors are the practices for extending the lifespan of deep cycle batteries:

Proper Charging

Use an intelligent charger compatible with the battery type and employ multi-stage charging methods to protect the battery and prevent overcharging or undercharging. Try to avoid discharging the battery to more than 80% depth before recharging. Additionally, it is best to perform an equalization charge every 1-3 months to help extend the overall lifespan of the battery.

Regular Maintenance

For open lead-acid batteries, you need to regularly check the electrolyte levels and battery terminals to avoid issues caused by water evaporation and poor connections that can affect the battery’s normal operation.

Proper Storage

Batteries that are not in use for an extended period should be stored in a dry environment with appropriate temperature and good ventilation. You should also charge them periodically and maintain the charge level between 50% and 70% to prevent capacity degradation.


How Long Can A Deep Cycle Battery Last Without Charging?

This question involves the type of deep cycle battery, self-discharge rate, power demand of the equipment, ambient temperature, and the battery’s health condition. Suppose there is a 100Ah deep cycle battery that provides power to a device with a power consumption of 10A when fully charged. According to the formula 100Ah ÷ 10A = 10 hours. That is, theoretically, this deep cycle battery can be used for 10 hours without recharging.

If the battery is in an idle state and under optimal conditions, a deep cycle battery can last approximately 6 months before requiring a recharge.


Having read this far, we should have an understanding of the lifespan of different types of deep cycle batteries and how to extend their longevity. We hope this article helps you choose the right deep cycle battery and enhances the efficiency of your battery in future use.

Recommend Deep Cycle Lithium Battery

Delong lithium deep cycle batteries use lithium iron phosphate cells with excellent stability, achieving up to 6,500 charge and discharge cycles. Paired with an integrated intelligent BMS, they effectively prevent issues such as overcharging, over-discharging, high temperatures, and short circuits.

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