Review on HiLetgo DC DC Module Charger Arduino by Robert Sorrells

Every modern USB power bank switches off at very low loads, even those with a reload function (not a defect but overcharge protection). I wanted to power a USB alarm clock without using a wall wart and no power adapter would stay on. Enter this device. Soldered to the locking connector I can use a 9 volt battery as a last resort or for longer duration a 6 cell battery holder (six because I wanted to use rechargeable cells and 4x1.2v is only 4.8B which is too is little ). The USB lamp is also connected to the clock so I get both powered through it, just like a wall wart.