Does This Apply to Everything?
4. Understanding Different Battery Types
While the 80% rule generally applies to most devices that use lithium-ion batteries (smartphones, laptops, tablets, etc.), it’s important to note that not all batteries are created equal. Electric vehicles (EVs), for example, often have more sophisticated battery management systems that can mitigate some of the risks associated with charging to 100%.
EV batteries are typically much larger and more complex than those found in smaller devices, and they’re often designed with a buffer zone at the top and bottom of the charge range. This buffer zone helps to protect the battery from damage and extend its lifespan, even when charged to full capacity. However, even with these advanced systems, consistently charging an EV to 100% and leaving it at that level for extended periods can still accelerate battery degradation.
Also, some older battery technologies, such as nickel-cadmium (NiCd) batteries, had a “memory effect,” where they would lose capacity if repeatedly charged to less than full. But lithium-ion batteries don’t suffer from this issue, so you don’t have to worry about conditioning them or cycling them fully.
In short, while the 80% rule is a good general guideline for lithium-ion batteries, it’s always a good idea to consult the manufacturer’s recommendations for your specific device or vehicle. They may have specific guidelines for optimizing battery life that are tailored to the particular battery technology and management system used.