I thought this might help with those asking about fitting original Sinclair battery tops to an alternative battery.
This is the type 015 battery purchased by Henrik , as you can see it benefits from having the terminals in the same position as the red Sinclair battery and is a close match in physical size.
(http://i74.photobucket.com/albums/i257/1stbooboo/soldc5001.jpg)
(http://i74.photobucket.com/albums/i257/1stbooboo/soldc5002.jpg)
(http://i74.photobucket.com/albums/i257/1stbooboo/soldc5003.jpg)
(http://i74.photobucket.com/albums/i257/1stbooboo/soldc5004.jpg)
..even the Sinclair carry straps fit nicely 8)
You do need to enlarge the holes in the battery top for the terminal adapters to fit through...but other than that it is very straight forward.