To make your Raspberry Pi time lapse device more portable you can add a battery pack!
Anker 10000mah Astro 3e on Amazon
The Anker Astro 3e Battery pack is available with 10000mah cell and features dual usb output BOTH at 1A – This allows you to charge an average smartphone 5 times from the battery.
Specifications on back of box:
Product is supplied with a short usb cable and various adaptors to allow connection to major products (and Raspberry PI)
The Battery arrived fully charged but charging from empty takes around 20 hours. It features 4 lights that indicate how much charge is left in a minty blue colour. In my early tests I have connected the battery to the Raspberry PI and powered it continuously for 14 hours.
In my test I used a Model B Raspberry PI with Camera and Edimax Wifi Dongle connected using wifi. No keyboard, No Screen. Just used putty to connect to it.
To keep it busy I ran a time lapse screen capture every 15 seconds for over 12 hours.
The battery was still functioning on its last blue segment - but felt happier being able to shut down the PI safely! (didn’t want to corrupt my memory card!)
Overall I would say this is a very good well built product. Highly recommended.