safety guidelines when dealing with a large number of batts even at just 24volts, ALWAYS cover any exposed stud,bar,anything that is metal even your tools. Chances of a shock killing at these volts I would not worry about. But the chance of shorting your pack out and setting things on fire and or melting metal is way way way higher. Any time you work on the bike remove power. Also take off any metal on your body, watch/rings/magic copper arm band.
And read this story. But don't fear a plasma ball at these volts for most motorbikes
http://www.evdl.org/pages/plasmaboy.html