2. Unless someone can prove me wrong the game.com (No caps in name) was the first cart based handheld (dont bother its shite)
3. No back light, small screen, no moving parts = loads of power on time. (Do bother its great)
4. First console was the Magnavox. (Dont bother its shite).
5. This depends on the way its played. brightness and sound on max = power drain. The Game Gear has rubbish battery life.
It can be "Changed" on the inside to give it a better light and more battery life as the bulb inside it is rubbish