Portable charger for camera battery

[Bluepica]

Is there any portable charger like those usb kind for camera batteries available in the market? I tried to google it only returns some solar battery charger ...

I'm using a canon point and shoot cam, not those SLR... to buy an extra original battery is damn ex, those 3rd party batt doesn't last at all..... one charge definitely not enough for a whole day out while on holiday.

 

How I wish they are camera that uses normal batteries, easy to switch when running out of batt....