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Buying new batteries + sim card problems

Home › Forums › Mayfly Data Logger › Buying new batteries + sim card problems

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    • 2024-10-10 at 2:40 PM #18679
      Elliot Ma
      Participant

        Hi,

        We’re looking to buy new 3.7 V 4400 mAh batteries for our Mayfly 1.1 and it seems that both the Adafruit and the Digikey vendors on the parts list table are both sold out. Any recommendations on replacement batteries that we could look for or are we okay with buying any general 3.7 V 4400 mAh batteries we can find that have similar configurations?

        Thanks

        Elliot

      • 2024-10-10 at 2:53 PM #18680
        Elliot Ma
        Participant

          Nevermind! We’ll just buy the 6600 mAh battery

        • 2024-10-10 at 9:54 PM #18687
          Shannon Hicks
          Moderator

            Everyone has been out of stock of that particular battery for the past 6 months.  As you said, you can use the Adafruit 6600mAh pack (https://www.digikey.com/en/products/detail/adafruit-industries-llc/353/5054549), or you can use the single-cell 2200mAh cell (https://www.digikey.com/en/products/detail/adafruit-industries-llc/1781/5054543).  As long as the pack is 3.7v nominal and has the correct polarization of the red and black wires on the JST-PH connector, it’ll work.  We recommend using packs from Adafruit or Sparkfun because they always have the right polarity.  Using packs from other sources will usually have the connector pins backwards, which will result in catastrophic damage to the Mayfly board if it gets plugged in.

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