Cagiva raptor 650 choke - 2001 Cagiva Raptor 650

should be either rotate out of the way or there are screws/bolts you are not seeing that you need to remove in order to take off the metal plate and the battery :)

When mine did this it was a spade connector which came loose - best bet to check and clean all connectors,
Optimate use seems to make it happen more so I'd start with all the connectors that you can see in and around the battery box

also check out raptorchapter 'dot' org 'dot' uk (for 650 and 1000 raptors) theres another owner on there with similar problem