The manual just states that its a maintenace free battery and it should never be replaced with a conventional battery. Sounds like a load of shite to me...

After a bit of hardcore googling it looks like it is probably a Yuasa YB9L-A2, but if anyone out there has a ZXR250/ZX2R and feels like confirming this for me it would be greatly appreciated.
The bike has an autowatch alarm which probably doesnt help the battery much, but after a 2 hour ride the frieking thing still wouldnt start again the next morning, so it looks like the battery is toast.
Cheers guys,