Finding a battery that is a good match for the Morserino can be difficult. Most batteries that work for the Morserino come with a JST connector. It’s recommended that the batteries be a single cell, 3.7 volt LiPo around 500mAh. I found a good battery with a Molex connector to match the Molex connector on the Morserino, but when it arrived, the polarization was opposite of what the Morserino used. Here’s my fix.
This is the battery I purchased. It isn’t thin enough to go underneath the Morserino.
https://www.ebay.com/itm/193825796773?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=Ruw6B9AbRRm&sssrc=2047675&ssuid=sAgZt_RCQXG&widget_ver=artemis&media=COPY
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