This isn't my video, but I want to post it here for those who don't have a digital multi-meter yet. They are a good tool to have for battery safety, and are not difficult to use. The video is by a vaper, GeekGirlVaper, so it specifically shows how to use a mutli-meter for vaping needs. The main thing to remember with these it to set them at a higher voltage then the battery you are measuring. e.g. If your battery is in the 3.7-4.2 volt range, set the multi-meter at 20v.
