I bought a battery with my micro trolley, but it wouldn't charge so opened the box and put the connector back which thought was problem(picture with me holding wire). Is it worth buying a replacement unit (£120) or replacing the bits myself? At the end of the day if it fails I can't work. The battery in the pictures was held in with sticky tape stuff, get some more of this? It keeps bouncing about in box and isn't secure. Also, when you re-charge the batteries should you always leave them on charge for 24hrs? And at the end of the day leave them to charge overnight again? Not just an hour or something?