Low Current Lithium Ion Battery Pack - 2.5Ah (USB) - TOL-15204 - SparkFun Electronics
Amazon.com: HW USB Rechargeable AA Batteries, Lithium Ion 1.5v Constant Output 2800mWh(1860mAh), 2 Hours Fast Charge,1000+ Cycles Double A Batteries, 4-in-1 USB Charging Cable, 8-Pack : Health & Household
Amazon.com: Survival Frog EasyPower USB AA Rechargeable Batteries -1.2V/1450 mAh Long Lasting Double A USB Rechargeable Batteries - Rechargeable Batteries Co. - (4 Pack) : Electronics
10,000mAh Fast Charging, Power Delivery (PD) Portable Battery/Power Ba – Digipower