Dual battery
Also known as: dual charger, two-bay charger
Charging or carrying two camera packs at once, which is the practical answer to a body that runs for well under an hour.
Updated
What it means
Dual battery usually describes a charger with two bays rather than a camera holding two cells. The point is how fast packs come back: a session consumes them faster than a single charger can replace them.
The arithmetic is simple and unforgiving. A camera recording at a high specification runs for a fraction of a day, so the number of packs rather than the Battery life of any one of them decides how long filming lasts.
It matters more in the cold, where capacity falls sharply. Winter sessions need both more packs and a way to cycle them, which is exactly what a two bay charger provides between runs.
How it works in practice
Charging two at a time between sessions rather than overnight is where it earns its place. A lunch break is long enough to restore two packs and not long enough for four on one charger.
Labelling packs is worth the effort once there are several, because an unlabelled pile makes it impossible to tell charged from flat without testing each one in the Front screen of the camera.
Keeping them warm matters as much as keeping them charged, so the pocket discipline behind Cold-weather battery life applies to the spares as well as the one in the camera.
What to watch out for
Cells age at different rates, so an old pack in a set of four quietly becomes the one that dies first and is blamed on the camera rather than on itself.
Charging a cold pack damages it, and a charger that accepts one without complaint is not evidence that doing so is harmless. Warm it first, then charge it.
A battery dying mid recording is also how an unfinalised file happens, so running packs to empty rather than swapping them early invites a Camera crash file along with the lost footage.
How RawClip handles it
A session filmed across several battery swaps arrives as many separate files rather than a few long ones, which is the normal case rather than a problem. Clips are reassembled by timestamp, so the swaps are invisible in the finished highlight.