I have pried open a lot of different batteries when i was in school.

Heavier batteries usually last longer because they are usually alkaline batteries.
Carbon zinc batteries are very light.

So, cheap alkaline batteries can last longer than some expensive carbon zinc ( like eveready), although generally, on average, alkaline batteries are more expensive.

( for some reasons, i was collecting the carbon rods from zinc carbon batt. Secret project )

This post has been edited by @@@@@@@@@@: Jun 27 2022, 02:11 AM

For battery leaking problem,
the liquid inside the alkaline battery is corrosive. If cheap and thin materials are used, then it will just eat the layer.