Adafruit sewable power for wearables adafruit 653 the adafruit sewable battery holder is ideal for providing power to your next wearable project it accepts the popular cr2032 sized batteries which are usually 3v at 200mah the battery holder has holes in the ve and ve tabs which will accept a 5 needle and conductive thread should you want an extra secure fixing the back of the holder is flat enough to provide a good glue surface adafruit 653 sewable cr2032 battery holder for wearables