Everyone has to start learning somewhere; there’s no topic in the world you jump into and suddenly know everything about, and battery packs are no different. For beginners looking to learn something new, here are five must-know battery terms and their definitions to help you get started.
Capacity
Capacity usually means how much something can hold, like a car having a five-person capacity. However, this term is a little different when it comes to batteries. Battery capacity refers to your battery’s ability to deliver its stored energy at a particular power level for a specific amount of time. Knowing a battery’s capacity can give you an idea of how long it will last based on the amount of energy the battery puts out.
Charge Cycle
Charge cycle, also written as charge/discharge cycle, is a term that describes how many times your battery can be safely cycled – a cycle being the process of fully discharging your battery and then charging it back up again – before it starts to hold less power. A typical charge cycle will bring your battery to 100 percent; you can use it until it runs low, then charge it back up to full power. If a battery boasts 5,000 charge cycles, it should last without issues for around 13 years—assuming you charge it once daily.
Lithium-Ion
A must-know battery term for beginners is lithium-ion. Unlike older lead-acid batteries, lithium-ion batteries use the element of lithium as part of their makeup. Many golf carts and RVs now use large lithium battery packs due to the fact that these batteries are safer, longer-lasting, and of higher quality than lead-acid batteries.
Voltage
Voltage refers to your battery’s electrical potential. When shopping for new lithium-ion batteries, you’ll typically find voltages ranging from 12V to 72V. Using a battery with a higher than recommended voltage on a piece of equipment that can’t handle it can damage your machine, so make sure to check your intended application’s required input voltage before you begin shopping.
Current
Current is similar to voltage, but while voltage focuses on the “pressure” of electricity going through your battery, the current is the rate of power flowing through your circuits. Voltage measures itself in volts, while we measure current in amps. Voltage is often a cause, while current is the result.
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Frequently Asked Questions
How long do LiFePO4 batteries last?
A quality LiFePO4 battery can commonly deliver 4,000 or more charge cycles, often roughly 10 years or longer under the right conditions. Depth of discharge, temperature, charge settings, storage habits, and the BMS all affect the result.
How many years is 4,000 cycles?
One full cycle per day is about 11 years. Three cycles per week is more than 25 years on paper, though calendar aging becomes the limit first.
What happens at the end of a LiFePO4 battery's life?
It does not suddenly stop. It loses capacity gradually. A battery rated for 4,000 cycles may be specified to keep around 80% of its original capacity at that point.
Does temperature affect LiFePO4 battery life?
Yes. High heat speeds aging, and charging below freezing can damage cells unless the battery has low-temperature protection or self-heating.
How long does a lithium battery last in an RV?
Many years, when charging sources are configured correctly and the battery is protected from freezing charge conditions. Annual cycles are often fewer than in a daily solar system, but conditions vary more.
How should I store a lithium battery?
Store it at a partial state of charge in a clean, dry, moderate-temperature location. Disconnect parasitic loads and check it periodically per the manufacturer's guidance.
