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Power Bank for K3iii?

Lubbyman
Posted 21/03/2024 - 14:52 Link
Can anyone recommend a USB power bank for powering a K3iii? The use case is big focus stacks done outdoors without access to a mains supply. Live view, wireless trigger and multiple big stacks gets through a battery. And the last thing I want is for a battery to give up near the end of shooting a big stack. Presumably astro folk face similar problems.

The idea is to have full battery in the camera and power bank plugged in, the camera to use power from whichever it wants until both are depleted. The recommended Pentax external power supply won't do the job because it needs to be plugged into a mains socket - OK for indoors but not outdoors. From other forums it appears possible to do it with the right sort of power bank. What I'm after is someone to say 'I use X power bank for just that sort of thing and it works perfectly'. Then I can buy one with confidence and not have to try to work out which power banks will work and which won't.

Steve
Spad
Posted 21/03/2024 - 15:43 Link
I have two of THESE. They have a 240 mains plug built in to them.

I use a mains adaptor with either my K3, K5ii or K-S2. It easily does a 4 to 6 hour shoot at night in cold weather. That is even with a lens heater in the mix. They even power all my astro kit as well. When using for astro, I have a Raspberry Pi (with a USB3 Camera plugged in), my mount, 2 x dew heaters and a DSLR being run by them.

They charge pretty quickly and come with all the kit to charge in your vehicle too.

For 80 to 90 quid they really are good.
The Legendary Terry Pratchett once said:
At the beggining there was nothing....

Which exploded....
Edited by Spad: 21/03/2024 - 15:47
Lubbyman
Posted 22/03/2024 - 19:38 Link
Interesting suggestion. I hadn't thought of getting something with a 240V output - might be useful for non-photographic thingies, too. Not sure about the USB outputs, though. Apparently the K3iii needs USB C with Power Delivery 3 (PD3) protocol to get full functionality, there's no mention of PD3 in the power bank's specs. I'm no expert in such things, but PD3 seems to allow both power source and recipient to negotiate the right voltage and current. I think that's different to the K3 (original). Might be related to being able to recharge the battery in the camera with the K3iii but not the K3 (original).

Steve
Spad
Posted 22/03/2024 - 20:01 Link
I only use them for DSLR via the 240 socket. It happily runs both my Pentax and Canon bodies via main power sources.

The USB C socket powers my Raspberry Pi. It runs that fine, with 3 USB connections.
The Legendary Terry Pratchett once said:
At the beggining there was nothing....

Which exploded....
Lubbyman
Posted 23/03/2024 - 10:49 Link
Thanks for setting my thoughts off in different directions. Decision is made. For garden use, I'll get the official Pentax AC adapter for the K3iii and run it off a mains extension cable from an outdoor socket. Then think about getting a suitable power bank with 240v output to replace the extension cable in the garden, for big stacks when not in the garden and for more general use - such as backup power when VOIP phones replace copper cable and there's a power cut (and Murphy's Law says that mobile phone batteries won't have much charge when the inevitable happens).

Problem solved - until I notice a flaw in my reasoning!

Steve
pentaxian450
Posted 27/03/2024 - 20:36 Link
I've done some panoramas using a Gigapan (https://gigapan.com/gigapans/230093) with over 500 pictures, and never ran out of power on the battery in the camera. I carry an extra battery (or two) for security, so I'm wondering why you think you need an external power source.
Yves (another one of those crazy Canucks)

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