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Buying new batteries + sim card problems

This topic has 2 replies, 2 voices, and was last updated 2024-10-10 at 9:54 PM by Shannon Hicks.

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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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