I have always thought I need something like this. May be I need to check this out.

Belkin Power Pack – Charge your phones and tablets on the go

http://thegadgetfan.com/gadgets/belkin-power-pack-charge-your-phones-and-tablets-on-the-go.html

Belkin has released its Power Pack, a mobile charg­ing dock in India. There are 3 vari­ants which are avail­able and the price ranges from Rs. 1999 to Rs. 4799. Belkin Pow­er­pack allows simul­ta­ne­ous charg­ing of two devices.