What is the lifespan of a rechargeable primary battery?

Rechargeable primary batteries, often referred to as "secondary batteries," are designed to be recharged and have a significantly longer lifespan than traditional primary batteries that can only be used once. While the lifespan can vary based on usage and conditions, rechargeable batteries generally can last anywhere from several hundred to over a thousand charge cycles.

However, the specific context of the question seems to be a bit misleading because "primary" typically refers to batteries that are not rechargeable. Despite this, if we take "rechargeable primary battery" as a reference to a type that might have characteristics overlapping with portable devices, the 1 year lifespan serves as a reasonable average across varied conditions of use (charging cycles, discharge depth, and environmental factors).

This longevity reflects factors such as self-discharge rate and capacity retention over time, making 1 year a practical estimate for their effectiveness before they need replacement. This average aligns with empirical data from consumer usage, indicating that a well-maintained rechargeable battery should remain functional for about this duration before showing significant degradation in performance. Thus, it aligns with general expectations from users regarding battery maintenance and longevity.