We use 2 pin JST PH connectors for all our battery packs, and if you want to put a board in series, like our LC709203F Stemma QT battery gauge, this cable will be very handy!
Both ends have a JST PH 2mm pitch 2-pin plug. Between the two, 100mm of color coded wire — red for power, black for ground. No more soldering two pig-tails together!
This is an A-A cable, that means both ends have the same polarity, you can flip the cable around and it will always connect pin 1 to pin 1.