(5 Pack) JacobsParts Micro-USB TP4056 3.7V Battery Charger Module 7W DC UPS with Adjustable Step-up Boost Output 5V 9V 12V 27V

When connected to a single cell LiPo battery, this board provides micro-USB charging (with indicator LED) and an adjustable output voltage. The result is a very handy mini power supply for electronics projects.

Worked out great

They work fine electrically but the Micro USB port breaks off very easily as it's just held on by tiny surface solder joints.

son de mucha utilidad para pequenos proyectos, cabe destacar que el amperaje que entrega decae cada vez que subes el voltaje, y no seria util para aplicaciones de altoconsumo

Update- Asked for a replacement and received 5 more of these. ALL of them have shorted charging circuits! So in total, 9 of 10 boards I received are faulty. Changed review to one star. These charging boards are NOT reliable.Original review:__________________________Of a package of 5 of these, only ONE actually charges the battery. The other 4 are completely shorted on the input and show 0 ohms between the + and - inputs / micro-USB. (See Photo)The one that works, works well. But if you purchase these, be prepared to test them because whoever makes them does not appear to be doing so.

Hope this review will help someone or even seller. I got 5 of those and only 2 were working.I contacted the seller and they sent me 5 more boards right away, but again all 5 were not working.With 8 broken boards i definitely had room to test and play around. Turned out board has small design flaw.The gap between 1st +pin and ground is small and micro-usb port shorting 1st pin on the ground and need to be resoldered in order to free (+)It's super easy to test on arrival:Witn multimeter in continuity mode check if: IN+ and IN- are shorted to each other, if so you have non working board.

Envelope only contained 4 sealed packages.

All 5 had a short in the charging Circuit. Would not buy agian