Here is one easy way.
I see number of times charged in
Airdata in the Battery Info tab of the Power report page.
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It is possible to see much more about your batteries with a subscription, for example,
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I am not sure why with Flight Reader Pro's battery reports there are so many blank battery fields.
I'd like to see more battery data there, because I like and use the program often.
Maybe someone else can chime in?
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Hope that helps a little.