Go to your local Home Depot or similar, and look for insulating gloves.
Yes, I think there would be voltage. Even if there isn't, it's like with guns: even when you've just unloaded them, you still treat them like they're loaded. An acquaintance is now nicknamed Frodo (of the nine fingers) because he forgot this rule, and took out all but one of the shells before cleaning his pistol - and him a cop, too.
So yes, flip the switch too. In fact, there's an interlock so you can't get the cover off unless you do. And then check the leads with a voltmeter before unbolting... Maybe you're thinking I'm paranoid, but a battery pack does have enough power in it to kill you.
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