Deity Lithium AA Batteries, 8-Pack

These are lithium AA cells rather than alkaline, and the difference shows up in two places that matter on location: they weigh about a third less, and they hold their output in cold. Deity rates them from -40 to 60 degrees, which covers exteriors that would flatten an alkaline before the first setup.

Construction is leakproof, which is the failure mode that kills a transmitter rather than just ending a take. Eight cells ship in a carry case, so the spares in the bag stay a set instead of loose in the bottom.