Energizer Ultimate Lithium Unreliable?

Discussion in 'Handheld and Field Recorders' started by GTBecker, Aug 21, 2019.

  1. GTBecker

    GTBecker Member

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    Gear:
    DR-44WL
    I've been using Ultimate Lithiums in my DR-44WL. Too many times I've found that one cell suddenly, it seems, drops to ~1v and the recorder shuts down. I could excuse a rare bad cell, but this has happened five or six times over maybe six months. I no longer trust them, so I've begun using an external USB supply and will probably revert to alkalines.

    Has anyone also found Energizer Ultimate Lithium AAs unreliable?
  2. GTBecker

    GTBecker Member

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    Answering myself, I believe I've found a likely cause of Energizer Ultimate Lithium AA apparent "failures". It may be the very sharp discharge knee. http://data.energizer.com/pdfs/l91.pdf

    The cell essentially simply turns off when it is depleted, unlike alkalines which deplete slowly. This makes the power supply status indicator, the battery graphic in the upper-right of the DR-44 screen, useless; it will show full, then suddenly empty when using lithium cells.

    These leads to my realization that the four cells in the recorder always need to be changed as a group; replacing a single depleted cell with a new one just sets up the next cell "failure".
  3. -mjk-

    -mjk- Moderator Staff Member

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    From:
    Hukou Township, Hsinchu County, Taiwan
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    Wow, it falls off a cliff with no warning! I'm guessing the battery indicator can't display that battery's condition accurately enough to be of any use. By the time you notice, it's too late.