my suggestion would be to use the recorder as a “recorder” only and find a mixer to handle all of your front end ( phantom, better pre amp, actual pots/faders, usually constructed with better battery life) . I’ve run the Tascam DR 100 as a recorder being fed by a mixer for nearly half a day on productions. Pro Cell Duracell’s seem to work the best. QUESTION: I just bought a brand new lithium ion rechargeable battery for the DR 100, does anyone have a solid guesstimation as to how long this battery will last, given its fully charged and used in the scenario depicted above.