its weird some last 6-7 hours, and some batches last 4-5 hours, wish they werent so unpredictible
Speaking generally, not about the R44 in particular ...
Usually the biggest battery drain on a device like that is the
phantom powering. Make sure and have it "off" if you don't need
it. If you don't need headphone monitoring, turn that "off" because
it eats juice. If you don't need the unit's lights on then turning
those off helps to conserve battery power.