What is the life expectancy of the BPU when stored outside?

The life expectancy of the BPU (Battery Pack Unit) when stored outside is indeed 25 years. This figure is based on various environmental factors that can affect the longevity and functionality of such units. When stored outside, the BPU is exposed to conditions like temperature fluctuations, humidity, and UV light, all of which can influence its overall durability.

A life expectancy of 25 years suggests that under optimal conditions, the BPU can maintain its performance and integrity over a significant period. Proper maintenance and appropriate storage conditions can mitigate some environmental risks, thereby extending its functional lifespan. The other choices represent more conservative estimates, reflecting the understanding that environmental factors typically reduce the life expectancy of electronic and battery-related products when not stored in ideal conditions.