If you need a small, powerful LiPo which fits in a Feather board stack, check your local convenience store or gas station for the "My Blu" electronic vape device. At this time, they're on sale for $0.99. The plastic end of the device can easily be squeezed off at the junction with the body using flush cutters. Inside is a 3.7V 1300mAH LiPo. It's a nice battery even if you paid the usual $9.99 for the device. If you want, you can liberate a number of nice SMT parts from the control board as well.
You'll have to attach your own JST connector and I'm not sure if the battery has a protection device so take that into account.
Cheap, small LiPo for Feather available locally
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quarterturn
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dastels
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Re: Cheap, small LiPo for Feather available locally
Also, be very careful to wire the JST with the correct polarity. Look at photos of LiPo batteries in the Adafruit shop to see the correct wiring.
Dave
Dave
Please be positive and constructive with your questions and comments.