Adafruit LiIon/LiPoly Backpack Add-On for Pro Trinket/ItsyBitsy : ID 2124 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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DD08CRMB 5V 1A Ultra-small Li-ion Lithium Rechargeable Battery Charger Module instead TP4056 for Toy 18650 Breadboard Power Bank - buy at the price of $0.78 in aliexpress.com | imall.com
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Power Your Projects With a Built-In Lithium Battery and a TP4056 Charger – Ruben's Thoughts
10pcs 1A mini Li Lithium Battery Charger Module Board for Arduino UNO MEGA DUE Breadboard PCB 18650 solar panel mobile power|Integrated Circuits| - AliExpress