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I'll bet money that this "battery flaw" is just Spotlight indexing. The service battery warning is probably an actual bug, but anyone losing battery life after upgrading will probably see their battery life improved once indexing is over. That's what happened in my 2012 Macbook Air.

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For me, so far no. Even after the Spotlight indexing, I've noticed a very significant decrease in battery life after upgrading. I don't know why, and the Power tab in Activity Monitor doesn't give any hints. It doesn seem that the fans are also running more frequently than they used to, even on battery power.

It's almost always the case of some third-party program causing power draw (or other bugs like not sleeping when the lid is closed). Remove things until the problem goes away, and add them until they come back.

Maverics even shows warning after installation that "system is being optimized" and this process can impact performance and battery life.

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