I was looking at getting an inexpensive inverter to use with my car in case I needed a source of power in a long term power outage. It would mainly be used to charge up Ni MH batteries, an electric shaver, phone, laptop, etc., so nothing too demanding. But I've never had one before and still have questions. I've been doing some reading, and getting confusing information. The less expensive ones are called modified sine wave as opposed to pure sine wave. The modified ones are said to be ok for anything that doesn't contain sensitive electronics such as medical equipment. At the same time, I've heard that they often don't work with battery chargers which is the main thing I wanted it for. I've even read that it can damage such devices. What is the experiences of people here who use inverters with their car? Also, from what I've read, a smartphone can be charged 20-30 times before the car battery got too low to start the engine. Does that sound right? Most sources I've read say to never use an inverter without the car running, but if a smartphone can be charged that many times (they have around a 3,000 Mah battery), then it sounds like I could do all my charging with the car turned off, although I'm open to being corrected.