AAA is the size of the battery, there are many types and makes of AAA battery and the shelf life for each is different.
The shelf life for this battery is between 8-10 years if it is unused. Most batteries have a shelf life of 5-10 years unused. So the choice is yours my friend.
3 years recommended
I would not buy one that is over 6 months old. But the shelf life is at least a year. After the battery sits on the shelf for over 3 months it is a good idea to charge it before putting it into service.
AA battery have a 7 year shelf life on average.
Most 9-volt batteries have an estimated shelf life of up to ten years. At the minimum, they will have a shelf life of four years. Most packages of 9-volt batteries will claim a shelf life of somewhere between seven and ten years.
Chemicals in the batteries will react with air.
12 month
It depends on how new the battery is (in other words, how long it has been sitting on the shelf), but in most cases it will.
I would not buy any battery over 6 months old.
Hydrochloric acid has an infinite life shelf if stored properly and if no evaporation or entrance of water has occurred. Hydrochloric acid is used in rubber industries, fertilizers, textile and dyes.
A battery acid is a variety of acid used as an electrolyte in a battery - usually sulphuric acid.