I’ve bought it to charge my Lenovo laptop which requires 65W 20V power. A 12V source won’t work. I’ve got a 7s 24-29V Lithium pack - that works. The + terminal wasn’t well done, the through-whole to the backside wasn’t conducting. Make sure your wire goes through and shows up at the back side and put solder on both sides! Otherwise ok for the price!
Actually, it seems to output about 35-40W. My 2nd laptop exceeds that - meaning I can charge while not using it but it won’t work at all when battery isn’t full and switched on where it would drain at least 50W. At 25-35W some parts get 55 degree C hot. However it seems to have a safety shutdown for overcurrent. Not sure if it has safety shutdown for over-temperatures as well
Works
Tested and disappointed. 25w is maximum output. I tried to charge my laptop with 20v, but it drops to 12 and cannot give 60w output. I tried 21-30v input using laboratory power supply. I tried to add input and output capacitors without success.