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01-21-2016, 02:14 PM   #1
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Extending 645Z battery life?

Hello all,

I sometimes leave my 645Z shooting for star trails for many hours. The battery is amazing and usually gives me more than I require. However, occasionally I would like a truly long sequence - say 8 hours - without a break to change battery. This is in the field, so mains power not an option.

I know with some cameras, you can connect up to external batteries that have much more capacity. Anyone know a way to do that with the 645Z?

Thanks,

Ed

01-21-2016, 03:17 PM   #2
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This should do the trick:
Pentax K-AC132 (AC Adapter for K-3) reviews - Pentax Camera Accessory Review Database

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01-21-2016, 03:59 PM   #3
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Don't think that solves the OP's problem as there would be no AC mains - he needs a battery/solar -based solution.
01-21-2016, 04:13 PM   #4
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QuoteOriginally posted by jeallen01 Quote
Don't think that solves the OP's problem as there would be no AC mains - he needs a battery/solar -based solution.
You could take that adapter and run it into a (precharged) UPS or a small generator.

That is assuming Ed isn't hiking to get to the final shoot spot.

01-21-2016, 04:39 PM   #5
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A boat/car battery plus an inverter would probably by my solution if you want to play it safe.

I'm sure the 645Z isn't being left in a publicly-accessible area overnight

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01-21-2016, 05:33 PM   #6
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What is the output voltage of the AC adapter? With that info you need only a cable and the correct connector + battery(ies) to have extra power.
Or maybe we should ask Pentax to design a grip for the Z
01-21-2016, 07:01 PM   #7
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I've used a large car battery type charger that has a plug point on it before. Mind you in the UK, the power cable is eye waveringly expensive - 3 times the cost of the US for the same part!
01-21-2016, 07:37 PM   #8
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Actually I do mean being away from any mains power and often in a location that can only be reached by hiking. So it needs to be portable.

I know that Mamiyas could, for example, have their batteries replaced by a connection to a larger external battery that could still be carried around. Or perhaps the AC connection could be hooked up to a device that carries charge (like those things you can buy now that have a battery in them and can dump their charge onto a mobile phone's battery).

Not sure what the answer is, but looking for a portable, non-mains solution that allows the camera to run for longer than the already impressive battery life. Wish we could just buy a battery grip (like on a Nikanon) allowing multiple batteries to be used, but seemingly not.

01-21-2016, 09:57 PM   #9
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You can try something like this: Eliminator 1000A/700W Power Box | Canadian Tire Lots of stargazers use something similar to power their telescope mounts and depending on your power consumption, you may only need a small basic model. You should be able to find these power boosters at any Auto Supply shops.
01-22-2016, 02:50 AM   #10
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Maybe something like this for the 645Z: https://www.pentaxforums.com/forums/115-pentax-k-5/175176-diy-k-5-power-supply-12v-battery.html

Connect it to the new high powered battery packs you can now get for cars.
01-22-2016, 07:48 AM   #11
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Have you considered using one of the readily available portable USB 5Vdc output power banks (choose capacity as required) and then a small 5dc-to-12Vdc converter module in front of one of those SWAD-J3 regulators shown in the thread linked here in an earlier post to get the correct camera input voltage (which also shows the required plug to fit the 645 dc-input-socket) - might be lighter than a car booster pack?
01-22-2016, 01:38 PM   #12
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Or modify the cable from a 12 volt socket to a USB socket and use one of those battery packs like the Minimax and similar products. Put one of these in the loop to help protect your camera. Screem allows you to monitor the amps, volts, etc

Last edited by TheDocAUS; 01-22-2016 at 01:49 PM.
01-22-2016, 02:02 PM   #13
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Many battery's used in miniature car and boats. Just have to figure out how to make a connector.

Lipo accu 7,4 volt 6000 Mah Hardcase Deans Stekker
01-22-2016, 02:04 PM   #14
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Wow - thanks guys. Some super ideas there! I will keep you posted!

Ed
01-22-2016, 04:26 PM   #15
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Further thought: all depends on how long you want the camera to operate for.

Therefore, since you said that 8hrs is the desired longest set of exposures, how many multiples of the normal internal battery life is that (3-5?)?

Then use that multiple to decide how long you need the external baterry source to provide - I doubt that it would be more than 4-5, which would probably means that a good quality 10Ah exterior source should be more than enough. Thus, a car battery booster sounds like real overkill.
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