On further investigation I have found this item:
http://www.ebay.co.uk/itm/POWABYKE-PEDAL-SENSOR-SIMULATOR-/181248949557?pt=UK_SportGoods_CyclAcces_RL&hash=item2a33477d35
If it allows you to pedal without feeding in power on your journey you could regulate the battery usage more wisely. I don't know if this how it operates but you could contact the seller and find out.
http://www.ebay.co.uk/itm/POWABYKE-PEDAL-SENSOR-SIMULATOR-/181248949557?pt=UK_SportGoods_CyclAcces_RL&hash=item2a33477d35
If it allows you to pedal without feeding in power on your journey you could regulate the battery usage more wisely. I don't know if this how it operates but you could contact the seller and find out.
