12mm Coin Cell Breakout Board : ID 1868 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
2103 - Keystone - Battery Holder, 1/2AA x 1, PCB
AA Battery Holder PCB Mount
Amazon.com: SDTC Tech 8-Pack 3.7V 18650 Battery Holder with Soldering Pins 1/2/3/4 Slot Black Plastic Battery Case Kit for DIY Parallel or Series Circuit PCB Projects(2 Per Size) : Electronics