mobile devices

I have a remote backup charger which has 3000mAh stated on it. What does it mean. I know it is associated with current and stuffs. but how actually can i get to know about the concept behind this milli ampere hour stuffs??

Everyone faces airplane flights their own way: sleeping, reading, talking to neighbors. Most of us listen to music, play games or even do work using our cell phone or tablet or laptop. But then there are those agonizing minutes when the plane is landing FAA: Flyers Can Use Electronics During...