Adjustable LiPo battery charging circuit

So I found myself having a lot of small 1 cell lipo batteries from various devices and gadgets I took apart (broken before or after I disassembled them) and no way to charge them. Recently I found a small boost converter to power small 5V devices. It has a USB female jack on one end and 2 solder pads on the other. It uses anything from 1.5 to 4.5V to output the needed 5V at a maximum of 450mA. The batteries I have would be great but I have no way to use them multiple times. This is the result:

DIY lipo charger

It looks ugly but it does the job great.