The product works in 30 minute increments. Each 30 minutes would give you 2 hours of charge in your device.The device would be available at the bar in pubs for a small fee per 30 minutes. (30 minutes = £1, 1hour = £2, 1hour 30minutes = £3 etc) On a scale of 1 to 10 (1 being not likely and 10 being very likely) were would you rate the likeliness of you using this product if it was available in a pub.
Some places would require a deposit as well as payment for your required time using the product. If a deposit of £5 was required would this change your response from above?
Do you regularly use trains or undergrounds? If yes would you use the product if it was available from a vending machine at the station?
£10 for the product would give your device our maximum amout of charge (8 hours of charge in your device). On returning the device to a vending machine (a day, a week, a month later) you would get back £5.