Wanted Battery holder for 48v 13amp battery

[Tony54]

Hi, I've got a Venice which is so far excellent. But, I'm after a battery holder from ncm at 48v 13amp for my bafanged triban hybrid project.
The logic is that I can then use my ncm battery on both bikes.
Leon.co.uk have closed shop so will I have to ring Leon in Germany to get hold of one or someone miraculously may have one.
Thanks for reading.
Tony, uk