![why there is a third connection in my battery powered vaccum cleaner. ? battery voltage reading is zero. i wnat to replace battery. but i don't know what this third connection means? : why there is a third connection in my battery powered vaccum cleaner. ? battery voltage reading is zero. i wnat to replace battery. but i don't know what this third connection means? :](https://i.redd.it/d7csu896vpna1.png)
why there is a third connection in my battery powered vaccum cleaner. ? battery voltage reading is zero. i wnat to replace battery. but i don't know what this third connection means? :
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