Wrong, as has already been mentioned. If your VM is reading high (a spanking-new lithium half-AA battery is never more than 3.67-3.68V), the other battery is just over 2.9V. Take it as a matter of principle that 3.3V is the throwaway point, and 2.8V and less can even be inhibitory of operation, depending on the Mac model. Macs with a single battery (for PRAM only) are often better off with no battery than they are with a failing battery.
By the way, treasure any remaining site that offers Apple's Service Source manuals for download, but don't post the URL in open forum, lest the site not be offering downloads tomorrow.
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