Everyone has a mobile phone here. Landlines are fairly unheard of for most homes. Many Pepe carry a second battery for their phones with them. Sadly battery technology has not caught up with mobile phone demands. I can stretch out the beret in my Galaxy Tab 8.9 to 12 hours or so, under light use. I can also kill it in about 4 under heavy use without video. Haven’t tried doing a lot of video and I know there is a game that just burns the processor really warm, which in sure will chew a battery life up pretty good.
So, it should come to no surprise to find battery charging stations around the city.
I have seen such devices at subway stations too in Seoul. These are free to use and many times with subway stations, you might even get a computer to browse the internet :)
You can also go to many stores and who for a charge as well. Never really stuck for power here.