hey mate..... i'd be a bit careful, full w2 is more like 40-45km, not 30km stated above. The full w2 is with "the wall" and "whites level" combined (its a great XC loop with some enduro-ey descents, nothing too bad though).
I've done W2 many times on a ff levo with both 500w and 700w battery, there was plenty left in both without being too miserly with power modes.
The other thing to be mindful of is that lots of "the wall" has been closed recently due to logging. I ended up doing skyline the other day (52km) as large parts of W2 were closed. Hopefully its all back open now though.