RYOBI USB Lithium 3.0 Ah Lithium-ion Rechargeable Battery (2-Pack) FVB203 - The Home Depot
Amazon.com: Lankoo USB C Lithium ion Rechargeable Battery, High Capacity 1.5V 5000mWh Rechargeable C Battery, 2.5 H Fast Charge, 1200 Cycle with Type C Port Cable, Constant Output,2-Pack : Health & Household
Low Current Lithium Ion Battery Pack - 2.5Ah (USB) - TOL-15204 - SparkFun Electronics
Adafruit Universal USB / DC / Solar Lithium Ion/Polymer charger [bq24074] : ID 4755 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits