PNY T2600 Portable USB Battery Charger
Offers found from£9.99
Your smart phone can barely make it through one day without running out of battery, let alone three days in a field.
Reception may always be bad at festivals but you may want to take some pics, so a portable charger is an absolute must. This one doesn’t have a catchy name, but it will give your phone one dose of full power. Oh, and it’s rechargeable.