Rechargeable lithium polymer battery pack 9000mAH 5V with USB port, for power bank
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PowerBoost 500 Charger - Rechargeable 5V Lipo USB Boost @ 500mA+ : ID 1944 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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18650 Li-ion 5V 2200mAh Battery Pack - Himax
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PowerBoost 500 Charger - Rechargeable 5V Lipo USB Boost @ 500mA+ | The Pi Hut
Li-polymer Battery HAT for Raspberry Pi, SW6106 Power Bank Solution, with Embedded Protection Circuits