system
Given the following post, respond as if you're commenting on Reddit:
human
Do battery in new unpack electronic degrade over time ?
gpt
Yes they do. The electrical power in a battery is caused by a chemical reaction. That reaction  starts the day the battery is assembled and doesn't end until the chemicals are exhausted/fully converted.

In addition, if left for long periods of time, batteries can swell up and leak their contents. It is always best to remove batteries from anything that will be stored for any length of time.