Are Deep Cycle batteries good for cars

Deep cycle batteries are not typically used as the primary starting batteries in cars. Instead, they are designed for applications where the battery needs to provide a steady, deep discharge over a longer period, such as in RVs, boats, golf carts, solar power systems, and electric forklifts. Deep cycle batteries have thicker plates that are better suited for these deep cycling applications.

Starting batteries, on the other hand, are designed to deliver high bursts of energy to crank the engine and then quickly recharge. These batteries have thinner plates and are optimized for providing the high current needed to start the vehicle's engine.

Using a deep cycle battery as the primary starting battery in a car is not recommended because it may not provide the necessary cranking power and could lead to difficulties in starting the engine. However, some vehicles, especially hybrids and electric cars, use a combination of a starting battery and an auxiliary deep cycle battery for accessories and electric power. In these cases, the deep cycle battery is used for different purposes and not as the primary starting source.

If you're experiencing issues with your car's battery, it's best to consult with a professional mechanic and choose the appropriate battery type for your vehicle's specific needs, which is typically a dedicated starting battery.

Are Deep Cycle Batteries AGM or Gel

Deep cycle batteries can be either AGM (Absorbent Glass Mat) or gel batteries. These are two common types of deep cycle batteries, each with its own characteristics and advantages.

  1. AGM (Absorbent Glass Mat) Batteries:

    • AGM batteries use a special type of glass mat separator that absorbs and holds the electrolyte (acid) between the battery plates.
    • They are known for their sealed design, making them maintenance-free and preventing acid leakage even if the battery is damaged.
    • AGM batteries are typically more resistant to vibration and shock, making them suitable for various applications, including recreational vehicles (RVs), boats, and renewable energy systems.

  2. Gel Batteries:

    • Gel batteries use a gel-like electrolyte that is immobilized within the battery cells.
    • They are also maintenance-free and spill-proof because of their sealed design.
    • Gel batteries are known for their deep cycling capabilities, making them ideal for applications where a steady and deep discharge is common, such as in solar power systems and electric wheelchairs.

So what will it be AGM or Gel?

Both AGM and gel batteries are considered deep cycle batteries, which means they are designed to handle repeated charging and discharging cycles without suffering from reduced capacity or performance. The choice between AGM and gel batteries depends on the specific requirements of the application and the preferences of the user, as well as factors like cost, maintenance, and environmental conditions.

Some products to consider might be:

Why you can't use a Lead Acid charger on Lithium Batteries

The importance of using the correct charger for lithium batteries becomes apparent when comparing standard 12V lead acid batteries used for deep cycle applications with their lithium counterparts. Although the nominal voltages may seem similar, with lead acid ranging from 12.5V to 12.9V and lithium exceeding 13V, it is essential to understand the differences in charging behavior and requirements.

Lead acid chargers typically allow a longer duration for bulk charging, around 20 hours, while lithium batteries require a much shorter time, usually 4 to 5 hours. This discrepancy arises because the charger's capacity should be within 20-25% of the lithium battery's fully rated capacity. Rushing the charging process for lithium batteries can cause overheating, potential faults, and failures in the Battery Management System (BMS).

The subsequent charging stage, known as the Absorption stage, differs significantly between lead acid and lithium batteries. Lead acid batteries exhibit increased internal resistance as they approach their maximum capacity, absorbing every last bit of energy. This process, accounting for 40% of the total charged capacity, brings the battery to around 80% state of charge (SOC). However, lithium batteries do not require this absorption phase. Instead, the charger algorithm typically transitions straight to a float voltage as the lithium battery is already at 80-90% SOC. The purpose of the float voltage is to slowly balance the remaining capacity without overloading or overheating the BMS. During this absorption charge, the balancing system may activate, and the BMS may initiate a shutdown to allow the unit to cool down and the cell voltages to return to nominal levels. These additional stressors on the BMS can compromise its functionality and longevity.

It is important to note that other charging issues, such as thermal runaway, can occur when using the incorrect charger. These issues further strain the cells and contribute to the premature degradation of the battery. Lithium battery lifecycles are typically measured in years rather than cycles. While the claim that "it works fine" may initially seem valid within the first year, a lithium battery is often sold with the expectation of a 10-year lifespan and 6000 cycles. Evaluating its usable power and performance at the five-year mark will reveal whether the battery is still functioning as originally advertised.

In summary, using the correct charger for lithium batteries is crucial due to the significant differences in charging behavior, absorption stages, and BMS requirements. Neglecting these considerations can lead to safety risks, compromised performance, and a shortened battery lifespan.

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