Power Bank (Stockport SK3)

This has been in the garage for ages and I think the internal battery has failed, I have brought a new charger for it but it doesn't seem to take a charge. The internal battery is a 12v dry cell type and can be purchased from most battery stockests. I was going to replace it but no longer have the need for it. Please leave a phone no. and a day/time you would like to collect.