So on my phone I'm always puzzled if my battery is aging or if the apps are getting hungrier. So a similar question with Powercore, is it aging or is the device I'm connecting to it just getting greedier.
Having an app to tell me how the Powercore is doing would be helpful.
Currently I use a USB meter which measures the mah in and out to infer. I used it last on my older 10000 and inferred it was aging and justified buying a new 10000, but most of the time it is "enough" to replace after 18 months to 2 years.