system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why do batteries especially phone batteries eventually stop holding as much charge?

My phone batteries and computer batteries always seem to stop lasting as long.
gpt
Imagine batteries as buckets that you can fill up with liquid energy. The nice thing about rechargeable batteries is that you can fill the buckets up many many times with liquid energy, and pour out a little bit at a time into your phone or your computer or really whatever electronic device you want to power. However, the liquid energy can be thought of as having a small amount of grime/dirt in it. Each time you add more liquid energy to the bucket, a small amount of dirt/grime (corrosion within the battery) sticks to the inside of the bucket and rusts it a little bit. Now, rechargeable batteries are made to handle this corrosion, but eventually the buckets are no longer able to hold a charge as they have been corroded to the point where the liquid energy drains out the corroded holes instead of where you intended to send that energy.