Hi again,
I have Just spoken to Jakub at Autobase, he mentioned that when you took the bike you were happy to take the battery and charge it. He also said that the battery did have a holding charge in it so I can only assume the auto battery deep sleep mode had kicked in and what you saw was the battery in deep sleep. When you charged it you will have woken it up. I am now 100% certain that there is nothing amiss with the battery you have. If you would like to change it I am still happy to do so, however I would need to make a charge to deliver and collect a new battery to and from Autobase.
We will test the battery when we get it back here and if it is not holding a full, as new, charge we will happily refund double the delivery and collection charges to compensate you for any "to-ing and fro-ing".
All the best, David