BENEWY sourcing map Power Supply DC 3.7V 1000mAh 703048 Li-ion Rechargeable Lithium Polymer Li-Po Battery

I don't know whether there is a wiring convention for the tiny two-pin connectors attached to these batteries, but I found that the wiring was the wrong way round for my Onion Omega2 IoT computer board. I was able to swap the wires over without breaking the connector by first levering up the plastic retaining tabs gently with a very small screwdriver and pulling the wires and receptacles gently out.

As with some the other revoews, I had to reverse the two wires but it is extremely simple (though you do need a very small screwdriver) and works as a battery very well.