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Yes, you need a good strong battery if you increase the compression a full point, and if your battery is weak for some reason, you will find out after the first couple of turns.
That said, if you get the idle mixture and pilot jet sizing right, usually it only takes a couple of turns for the bike to start. Usually my bike will fire up right after the second revolution.
IMHO the increased compression, while it definitely adds a bit of oomph to the equation, could also be left out, or at the very least left to a small increase. Opening up the exhaust port and smoothing out the intake as myself, jerry, and obviously a few others have done, makes a big difference in how these engines perform.
Increasing the compression also leads to stronger vibrations, so be aware of that side effect too.
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