system
Given the following post, respond as if you're commenting on Reddit:
human
Have AA batteries actually increased a significant amount in terms of energy storage since their creation?

Since their size has never changed has the energy storage increased? Is there a maximum amount of energy that can be stored inside a AA battery?
gpt
Yes they have. The first dry cells were zinc carbon, and in AA form that stored about 400-900 mAh depending on use. The standard alkaline AA holds 1800-3000 mAh. Lithium batteries (not the rechargeable lithium-ion) can hold even more.