I know driving techniques and water cooling etc affect run times, but are there any other ways of extending run times.

Im thinking particularly of the case with my twin prop Sintra 700, which is run by two battery packs. Im sure I read somewhere that theres something that can be done with twin packs to extend the run times

Any ideas anyone

Otherwise Im looking for some boat upgrades - what recommendations are there for reasonably decent performance boats with decent run times off the batteries