There’s some more information from Ricoh today about the new charger and how it works with the K-3 III.
To recap, the two new parts available are a power supply and a battery charger. They are sold separately or together as a kit. My understanding is that the camera will be supplied with the power supply but not the charger, which is how the GR III was sold. There are use cases where you could get by with just the power supply or just the charger depending on what you already own.
The old charger for the battery charged in 6.5 hours. They are comparing with the existing charger that many of us have because it was supplied with the K-7, K-5, K-5 II, K-3, K-3 II, K-01, K-1, K-1 II, 645D and 645Z.
When the power supply is attached to the camera, and the battery is charging in-camera (not using the charger), the charge time is 4.5 hours. During in-camera charging, the camera can still be used for shooting.
When the new power supply and charger are used together to charge the battery outside the camera, the charge time is 2.5 hours, so a 2.6 times improvement over the old charger.
You can charge by attaching the charger to a power supply you already own, directly to a computer or to a portable battery by USB (i.e. not using the Ricoh Power supply). I guess the charge time will depend on the combination. Ricoh can’t confirm that every device will work, but most do.
In addition, if you have the USB-C charger for the GR III, WG6 or G900 cameras, the new power supply can be used with that charger as well.
So overall, it offers quite a bit of new flexibility. This information is from the following video that was uploaded today.
The video is in Japanese and as usual the YouTube generated subtitles make a complete mess of it.