Review on DROK 110V 220V Converter Adjustable Transformer by Steven Adams

I bought this adapter to desulphate and balance car batteries every 6 months. I installed an ammeter with a shunt because you want to do it with as little effort as possible to avoid heating up the battery. What I do is measure the voltage of the battery and set the power supply to the same voltage to avoid power surges that could damage the power supply. After that I connect + to + and - to - from the PSU to the battery. I start increasing the voltage until I see about 3 amps on the ammeter. You will notice that the amperage drops as the battery charges. The idea is to keep increasing the voltage while keeping 3 amps on the ammeter so the battery doesn't get hot. Many car batteries can be charged up to 14.4V but this is battery dependent so always check with the manufacturer. Never exceed 14.4V unless you are leveling. After you reach 14.4, drop the ammeter as close to 0 amps as possible. Be aware that this is dangerous so do your research and also use protection if you do this. I'm just explaining what I'm going to use it for and I'm in no way encouraging you to do so. Always follow the manufacturer's data sheets to avoid explosions, and when working with batteries also be aware that some of them can release hydrogen which is an explosive gas and acid corrosive. So don't try this if you don't know what you're doing. There are many videos on YouTube about charging batteries with power adapters. I was planning to put a diode on the negative battery post, but it looks like the PSU already has one since the voltmeter on the PSU stays off when the battery is connected to it. There are 2 other very important things to remember when connecting: 1 - Select the correct voltage for your home using the red switch on one side of the power supply. In my case I chose 115V since I'm in the US. . 2 is that you must be very careful when working with live cords from the outlet. This power supply does not have a power cord, so you will need to find and connect it yourself and make sure you don't short-circuit or touch the cord. If you're scared or don't know how to take precautions when working with AC power, I suggest you look around for a better lab/lab power supply. It would also be advisable to fit a 5 to 7.5A fuse on the output. You never want to exceed 75% of the rating on these Chinese power supplies as I don't need the 10A I just used with a 5 fuse in the event of a short circuit or overcurrent.