All of the first-page results do just dumb nominal capacity divided by current calculation, which is pretty useless. This Microchip one seems bit more clever, b

All of the first-page results do just dumb nominal capacity divided by current calculation, which is pretty useless. This Microchip one seems bit more clever, but it is limited to Microchip microcontrollers only and is a separate installable application, so that is no good either: https://www.microchip.com/SWLibraryWeb/product.aspx?product=nanoWatt%20XLP%20Battery%20Life https://www.microchip.com/SWLibraryWeb/product.aspx?product=...