5 ms·

1.2V cut-off is ridiculously high even for alkalines. Looking at the charts from e.g. Energizer datasheets[1], it seems like going form 1.2V cut-off to somethin

by zokier 7y ago

1.2V cut-off is ridiculously high even for alkalines. Looking at the charts from e.g. Energizer datasheets[1], it seems like going form 1.2V cut-off to something more reasonable like 0.8V gives you whopping extra 50% service life. Alkalines are definitely not "almost dead" at 1.2V. [1] http://data.energizer.com/pdfs/en91.pdf http://data.energizer.com/pdfs/en91.pdf

nrclark 7y ago
that's a pretty interesting datasheet! If you assume a constant-power load like a low-dropout boost regulator, it looks like it depends a lot on the current draw. On that graph, you're right that the 200mA draw goes quite a bit farther after 1.2V. The 100mA draw is around 65-75% done at 1.2V. Presumably that exends to lower-power draws too. Thanks for linking that, it was neat. TIL
- zokier 7y ago
  > that's a pretty interesting datasheet! If you assume a constant-power load like a low-dropout boost regulator, it looks like it depends a lot on the current draw. One of my unrealized project ideas was to create a battery life estimation calculator, something you could feed in battery configuration, some power supply details (efficiency, cutoff), and consumption figures and get an estimate of battery life. The log-log charts are not all that easy to read and have only limited number of curves available.
  - bookofjoe 7y ago
    https://www.google.com/search?q=battery+life+calculator&oq=battery+life+calculator&aqs=chrome..69i57j0l5.27687j0j8&sourceid=chrome&ie=UTF-8 https://www.google.com/search?q=battery+life+calculator&oq=b...
    - zokier 7y ago
      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=...

by zokier 7y ago

nrclark 7y ago

that's a pretty interesting datasheet! If you assume a constant-power load like a low-dropout boost regulator, it looks like it depends a lot on the current draw. On that graph, you're right that the 200mA draw goes quite a bit farther after 1.2V. The 100mA draw is around 65-75% done at 1.2V. Presumably that exends to lower-power draws too. Thanks for linking that, it was neat. TIL

zokier 7y ago
> that's a pretty interesting datasheet! If you assume a constant-power load like a low-dropout boost regulator, it looks like it depends a lot on the current draw. One of my unrealized project ideas was to create a battery life estimation calculator, something you could feed in battery configuration, some power supply details (efficiency, cutoff), and consumption figures and get an estimate of battery life. The log-log charts are not all that easy to read and have only limited number of curves available.
- bookofjoe 7y ago
  https://www.google.com/search?q=battery+life+calculator&oq=battery+life+calculator&aqs=chrome..69i57j0l5.27687j0j8&sourceid=chrome&ie=UTF-8 https://www.google.com/search?q=battery+life+calculator&oq=b...
  - zokier 7y ago
    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=...