PowerBoost 500 Basic - 5V USB Boost @ 500mA from 1.8V+ : ID 1903 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Need a big battery for your project? This lithium-ion battery contains a 2200mAh and a protection circuit that provides over-voltage, under-voltage,

Lithium Ion Cylindrical Battery - 3.7v 2200mAh

PowerBoost 500 Basic - 5V USB Boost @ 500mA from 1.8V+ : ID 1903

Lithium Ion Battery Pack - 3.7V 6600mAh : ID 353 : $24.50

Adafruit Powerboost 500 Basic 5V USB Boost @ 500mA from 1.8V+ ada1903

PowerBoost 500 Basic - 5V USB Boost @ 500mA from 1.8V+ : ID 1903

PowerBoost 1000 Basic - 5V USB Boost @ 1000mA from 1.8V+ : ID 2030

Lithium Ion Polymer Battery - 3.7v 1200mAh : ID 258 : $9.95

Lithium Ion Battery Pack - 3.7V 4400mAh : ID 354 : $19.95

Lithium Ion Battery Pack - 3.7V 6600mAh : ID 353 : $24.50

PowerBoost 1000 Basic - 5V USB Boost @ 1000mA from 1.8V+ : ID 2030

Zero2Go Omini – Multi-Channel Power Supply for Raspberry Pi : ID

Power Products Category on Adafruit Industries

Adafruit MiniBoost 5V @ 100mA Charge Pump - AP3602A : ID 3661