DollaTek 10Pcs Multifunctional DIY Mini DC-DC Lithium Battery Boost Module Step Up Board Converter 3.7V to 12V Voltage Regulator Adjust 5V/8V/9V LED Indicator

I bought these as i needed to up 3.7v to 5v, my projects dont need lots of power so these are ideal for small projects which need 5v or more from a lithum cell, they are very stable too, pretty much well regulated and ideal for very small projects that you need to reserve space, absolutely tiny, create very little heat, and super stable voltage regulation, Really happy with them.

Tiny board, works well.

REMOVE THE 2 SMALL RESISTORS FOR 5V!

Using to convert from 5v to 12v, running 4 X 12v 0.08A fans. According to the description, it should be able to output 12v at 0.5A from a 5v source so just fine for my use case but it's giving me 0.25A max and getting VERY hot, even burned my fingers. It seems after testing, one of them burned out within five minutes. Would not recommend, and I'm asking for a refund, as they're not as advertised. Useless nonsense. Don't order!

Simple and effective, I used one of these to bring a lithium cell up to 5v for a servo

Does what it says on the tin with the exception of load. My opinion they are comfortable running at 1 amp but will let you down after a while running 2 amp.

Product are defects maybe 1/10 are works and even rhen you don't know for how long, not buy it!

Connected to an ESP12-e via a voltage regulator. Voltage at this booster device was 5v until the ESP started working, then it dropped to 2V. Held reset, back up to 5V, let it go, backdown to 2V. Measured the current when working- just over 500ma. Hopeless. Now I have to go look for a decent booster that will supply at least 1A.

Funktioniert wie in der Beschreibung angegeben. Kann beruhigt bestellt werden,

petit convertisseur pour passer de 12 Vdc à 5Vdc, fonctionne bien.

leggerissima basetta step-up per innalzare la tensione da 3,7V (pila litio) a 5,0V (uso modellistico in alianti senza ESC). Per ottenere i 5V bisogna dissaldare due microscopiche resistenze, dopodiche' funziona. Non ho valutato l'efficienza.

Muy contento con la compra, son muy pequeños y para el uso que le doy no se calientan.