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On-board MP1495 buck chip with high power conversion efficiency up to 90%, save energy. Maximum Output Current: 3A. n-board MP1495 buck chip with high power conversion efficiency up to 90%, save energy. | eBay!
US $0.99 incl. shipping
Dragino LT series I/O Module
It might not be the best bargain regarding price, but what that kit will save you is searching time : everything needed to install that protection circuit on a 18650 is included.
$1.34 per kit.
new - Arduino UNO WiFi Rev 2
I have some very small TFT screens… So I was thinking …
or what if you mount some LED’s on one side, easy soldering ?