haha thanks! I lazily just used a Anker power bank: https://www.amazon.co.uk/dp/B00D5T3QK4
For power efficiency stuff, check this out: http://www.jeffgeerling.com/blogs/jeff-geerling/raspberry-pi...
For power efficiency stuff, check this out: http://www.jeffgeerling.com/blogs/jeff-geerling/raspberry-pi...