Differentiating between old and new batteries can be done by testing their bounceability. When you mix old and new batteries, this method can help you distinguish between them. Simply drop the batteries on a table and observe their rebound. New batteries tend to have less bounce, while older ones tend to jump higher. Remember that this method is specific to alkaline batteries.
The science behind battery bounce
The variation in bounceability between old and new batteries can be attributed to structural transformations occurring within the battery itself. In an alkaline battery, the zinc anode consists of a gel-like substance that contains zinc powder. This gel has the ability to absorb shocks, which hinders the battery from rebounding significantly when it is new. However, as the battery discharges over time, the zinc undergoes a chemical reaction, forming zinc oxide and causing the gel to solidify into a harder state. Therefore, the increased solidity of the gel enables an older battery to rebound more easily when dropped, and that means an old battery can bounce more easily when it is dropped.
How to Quickly Distinguish Between Old and New Batteries?
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