Lenovo 45W Computer Charger - Round Tip AC Wall Adapter (GX20K11838)

today I'm going to be reviewing the on universal 45 watt laptop adapter and I want to talk a little bit about whether or not you should purchase this adapter and if this is the right one for your laptop so the first thing you should do when considering a universal depth for your laptop is making sure you get the correct wattage so how do I know mine was 45 watts and not 65 or 90 or other wattages well you can look up your particular laptop manufacturers website or instruction manual or you can look at the bottom of your laptop and maybe this information could be on your battery as well if you have access to it but on the bottom of the laptop it said 19.5 DC 2.31 amps input I multiply these two numbers together volts and amperage to get 45 watts so I knew I needed a 45 watt adapter so I looked online was able to find this one which I believe is exclusive to Walmart I believe this is a Wa