Alkaline Batteries in Series?

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i wanted run 4 d alkaline batteries in series ~6v. because alkaline batteries not rechargeable, wondering if put batteries in series different voltages (some used , new), won't new batteries higher potential try charge used batteries , problem? i'm curious if or isn't problem testing using batteries same voltages. in advance.

quote
won't new batteries higher potential try charge used batteries , problem?
no, it's not problem.  , because batteries in series, higher-voltage battery won't "try" charge weaker ones.


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