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Adafruit Industries Mini Lipo w/Mini-B USB Jack Charger - Micro Center

Lithium Ion Polymer Battery - 3.7v 2500mAh : ID 328 : $14.95

Adafruit Industries Lithium Ion Battery Pack - 3.7V 4400mAh

Solar USB/DC charger for Li-Ion and Li-Pol batteries - Adafruit 390

Adafruit Industries ItsyBitsy M4 Express featuring ATSAMD51