765 Battery Kaput, Repeatedly

When you say 'dead' I take it you mean the dash doesn't come alive and there's no indication of any power at all. If this is happening just after it's been running then I'd say it's not your battery but most likely a wiring fault.

I'd definitely be taking it back to the dealer whilst it's under warranty!!!!

 

I have a 765 and don't have these issues.
Do you have a voltmeter?
A quick check before cranking and after would soon give you a good indicator of the state of the battery. As others have said I don't think this is an internal battery fault; possibly a starter relay issue.

 

Post up your numbers.
Connect voltmeter before switching on = ww volts
Key switched on = xx volts
Cranking = yy volts
Running = zz volts

 

If the battery has been fully discharged several times it is most likely now not holding charge.

 

ContactSC.
Get it back to the dealer. The bike is not right and while you have warranty let them sort it.
Ride Safe
Joe.

 

Check the voltage between terminals engine running. About 13 volts at tickover and 14ish blipped throttle. It confirms your charging circuit is healthy and that the problem was purely use/battery related.

 

At those voltages mate you are quite a way off before you start.
A battery is a collection of cells normally six each giving 2.2 volts so fully charged in good condition you should be looking around 13 volts.
Around 11 volts bare minimum when cranking is required for the injection and other demands.
Confirm charging when running as pointed out is around 14 volts and all should be good to go.