Thanks again for all the comments and suggestions.
I see that I was misreading the capacity of the Anker power block that Nikon recommends for the Z9 — the Anker PowerCore+ 26800 PD 45W.
The reference to 45 watts is for the level of power output, not energy stored. It is rated at 97 watt hour (WH) capacity — good for taking on a plane and more capacity than I was thinking. So I hope that would charge at least 2 EN EL 18ds. I’ll test that, as I am not sure what I lose to the inefficiency of using one battery to charge another battery. Amazon currently lists the Anker power block at $140, so, as others noted, they are cheaper than adding more EN EL 18ds. Bigger and heavier though.
I’m going to test the Anker block to make sure that it will charge 2 EN EL 18ds, if they are down to the 20-30% range. I would hope so, but do not know how efficient a battery-to-battery recharge is.
I also want to test the battery usage of the Z9 with more intermittent shooting and no bursts. As agdogherty noted above, I’m guessing I can get more than a day out of an EN EL 18d in this mode — with airplane mode, a short standby timer, little to no VR (as most shooting will be from a tripod), and no video or GPS. I may also check to see how this changes if I use the GPS. It would be nice to geotag my photos. But I can also run a track on my (partially) solar charged Garmin Fenix 7 in expedition mode and compare times to get a rough idea of location.
If all this checks out, I can do the math on what combinations of EN EL 18ds and power blocks will be enough for 12 days — again in a situation where I will not have access to regular power, a generator, solar power or a vehicle. My Z7II with a handful of EN EL 15s (of various generations) can also be a backup for power (as well as other failures).
I see that I was misreading the capacity of the Anker power block that Nikon recommends for the Z9 — the Anker PowerCore+ 26800 PD 45W.
The reference to 45 watts is for the level of power output, not energy stored. It is rated at 97 watt hour (WH) capacity — good for taking on a plane and more capacity than I was thinking. So I hope that would charge at least 2 EN EL 18ds. I’ll test that, as I am not sure what I lose to the inefficiency of using one battery to charge another battery. Amazon currently lists the Anker power block at $140, so, as others noted, they are cheaper than adding more EN EL 18ds. Bigger and heavier though.
I’m going to test the Anker block to make sure that it will charge 2 EN EL 18ds, if they are down to the 20-30% range. I would hope so, but do not know how efficient a battery-to-battery recharge is.
I also want to test the battery usage of the Z9 with more intermittent shooting and no bursts. As agdogherty noted above, I’m guessing I can get more than a day out of an EN EL 18d in this mode — with airplane mode, a short standby timer, little to no VR (as most shooting will be from a tripod), and no video or GPS. I may also check to see how this changes if I use the GPS. It would be nice to geotag my photos. But I can also run a track on my (partially) solar charged Garmin Fenix 7 in expedition mode and compare times to get a rough idea of location.
If all this checks out, I can do the math on what combinations of EN EL 18ds and power blocks will be enough for 12 days — again in a situation where I will not have access to regular power, a generator, solar power or a vehicle. My Z7II with a handful of EN EL 15s (of various generations) can also be a backup for power (as well as other failures).
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