This is difficult to answer. I wonder if you are asking about calculator life or battery life? I answered separately.
1. Calculator life
The life of the calculator depends on the environment in which it is used. The environment is humid or overheated. The conductive rubber on the calculator keys will quickly deteriorate and will be over within five years.
If you use it too much, the keyboard will drop characters and the keys will not work, but it’s not a pity to use it badly. Where are most calculators aged?
When the battery is exhausted, the battery slot will be oxidized. After the battery is exhausted, it will grow green hair and corrode.
2. Battery life
The button battery is generally three years, and the AAA battery is generally one year. Whether you use it or not, just leave it there and run off. According to the manual of a general calculator, one hour a day will have a battery life of three years.
Solar batteries have a lifespan of about ten years, so they should be exposed to the sun frequently, just for a while, not too much.
Therefore, the button battery should be bought, such as Energizer brand; if it is a AAA battery, replace it once a year.
