I would never use a lipo on a starter simply because when you have the best performing starter on the flight line it will also be the most 'borrowed' and this precludes you from accurately keeping track of its usage and the risk of destroying those expensive batteries from deep discharge. Something thats very easy to do.

I run my common starters at 16.8 volts with Nimh dual seven cell batteries from 1700mah, 3,000 and 5,000.

John