now had another msg from buyer
"Hi, we made it exactly like that(my husband is quite good with these stuff).Unfortunately after being charged 15 hours the parents unit work not more than five minutes and then the alarm is starting. So it has to stay on the charger all the time. Definitely we need to buy new ones cost between 7 and 10 ponds depends on the brand and mAh...I would appreciate your understanding, thank you"
Do you think they are trying it on??? I don't really want to give them £10 back but then again I don't want to take chance of ebay taking whole lot back