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"Comimark 1Pcs MCP73871 USB DC Solar Lipoly Lithium Lon Polymer Charger 3.7/4.2V Battery Module"

Comimark 1Pcs MCP73871 USB DC Solar Lipoly Lithium Lon Polymer Charger 3.7/4.2V Battery Module
Comimark 1Pcs MCP73871 USB DC Solar Lipoly Lithium Lon Polymer Charger 3.7/4.2V Battery Module

Integrated System Load Sharing and Battery

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Electronics
Household Batteries, Chargers & Accessories
Battery Chargers

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1 comment of this product found across Reddit:
Baseless_Utterings /r/AskElectronics
1 point
1970-01-20 09:04:23.21 +0000 UTC

Just scanned through the specs for U3. I see the value in it. You could buy this already on a board with pretty much everything you need on Amazon:

https://www.amazon.com/Comimark-MCP73871-Lithium-Polymer-Charger/dp/B07V4PHKNX/ref=sr_1_1?keywords=mcp73871&qid=1674263067&sr=8-1