firmware battery upgrade

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    Professional Battery firmware upgrade

    OK so I upgraded my P3P from 1.1.9 I believe up to 1.3.2 then on to 1.8. Didn't think about having 4 batteries. My one battery works fine, but the other 3 day need upgrade. The batteries won't make the jump to the new firmware, I think because of the 1.3. The bird now won't downgrade that far...