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My ninja 250 won't run without some charge in the battery. If the battery is flat, it can't be bump started at all. Most of my other bikes will run without a good battery once it's bump or jump started.
Btw, if you have completely discharged the battery, it's safer to get a new battery and maintain it with a tender if not ridden frequently or only short trips.
Even if you manage to revive the current battery, it's going to fail without warning eventually. Small batteries like in the ninja 250 will seem to work fine one start and be completely dead next attempt when they fail. No warnings like dim lights, slow cranking etc before they completely fail. This was my experience
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