Radrhino 5 won't power on

[Vik]

Hey guys,

Nice to be here.
I've got a couple of radrhinos (EU version) and after 6 months of non-use (shipped them from EU to my new home in NZ) the bikes won't power on.. any ideas?
The batteries were 75% charged before going into 'storage'.
Here's what I've tried:

- Battery tested OK - all the tester lights come on after charge.
- Cables are OK, no breaks.
- Battery terminals all look intact and shiny.
- Can't see much wrong with connectors.
- Can't see water ingress signs anywhere.

Any ideas?

Thanks