Author Topic: Battery performance in the cold - D5300/D5500, D7500, D500 - test challenge  (Read 993 times)

Seapy

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Both links work OK for me, agreed, much nicer here, by far.  8)

I did notice a post in the thread from NFOTO, a life member with quite a few posts, some may remember him...  ;D
Robert C. P.
South Cumbria, UK

CS

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Both links work OK for me, agreed, much nicer here, by far.  8)

I did notice a post in the thread from NFOTO, a life member with quite a few posts, some may remember him...  ;D

Ayuh, I too was a life member, which probably means I'm dead and don't know it.  ;)
Carl

Seapy

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Dallas recently had a cull, which I narrowly avoided.  Else I would have been dead too.  But then maybe I am?  Is this the afterlife???  ;D  Whoops, OT.
Robert C. P.
South Cumbria, UK

Hugh_3170

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Thanks folks for the access feedback.  Yes, Seapy is right - Dallas did have a cull earlier this year of old unused logins which I had forgotten about.  I login occasionally, which is probably why I am OK. 

I will PM Řivind and see if he can open the two links to Jan Anne's original threads.

The first link shows how Jan Anne used a high capacity lithium battery which was connected by a cable to a "fake" EN-EL15 battery adapter for his D800E.  This means that the real battery is outside of the camera body and can be kept warm, without adding any heat to the camera body and in particular to the sensor.  The gist of it all is in the Ebay links that portray the componentry - modern day Ebay alternatives to these are still alive:

EN-EL15 adapter:  http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=111037377156&ssPageName=ADME:L:OU:NL:3160
 

Voltaic V60 Batterypack:  http://www.voltaicsystems.com/16wattkit.php

 

Voltaic MacBook adapter (scroll to Optional Computer Adapters):  http://www.voltaicsystems.com/adapters.shtml#laptop


******************************** 

The second link shows how he could use one of his EN-EL15 camera batteries to power his smart phone.   
Hugh Gunn

Řivind Třien

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Thanks Hugh. I have kept my Fotozone login to be able to access my old posts there, so I could access both of the links. Still looking though the information, right now drowning in open tabs from links in the posts.  ;D

Birna, I have emailed you some .pdf archives.

I tested opening the links in an incognito window in Chrome and I had access even there.
Řivind Třien

Birna Rřrslett

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Thanks, Řivind.

Řivind Třien

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After looking through links I found that selections are limited for battery devices with 9V output that most of the battery adapters require.

One of these is a series of devices referred to by Jan Anne, QIDIAN 1A/1.5A/2A/4A 6*18650 Mobile Power Bank Battery Charger Kit. The nice thing is that it is user replaceable 18650 batteries. I only found one that currently was in stock, the model almost at the bottom with 2600 mAh Sanyo batteries at $47.23. All other models out of stock or discontinued.  This would give 57.7 Wh capacity, but the device is fairly big, 183x92x24.8mm, Weight 163g presumably without batteries. So it might not be ideal for travel.
https://www.fasttech.com/products/1424/10004461/1341206
One could perhaps wait for a smaller model to be available, the 4 cell version with 3.4 Ah Panasonic batteries at $44.11 without power brick is out of stock and would likely be more ideal at 50.3 Wh capacity and 119.5 x 83.1 x 23.7 mm and 102 g for the case only.
https://www.fasttech.com/products/1424/10004461/1341407

The other device is one I referred to earlier with 37Wh capacity at $59.90. There are a couple of positive user reviews from someone who used it with Canon bodies for astro imaging. It is considerabley smaller,  125mm X 76mm X 23mm, 290g. https://www.amazon.com/XTPower-MP-10000-External-Battery-10000mAh/dp/B00935L44E

There are in addition a somewhat wider selection of devices that output 12-24V, especially among the solar power related ones, including the products from the Voltaic company Jan Anne referred to. However these tend to be expensive (for instance this one,  https://www.amazon.com/gp/product/B00ISH4WEW?th=1 ) and would require a DC to DC converter cable, adding some clutter/complexity - I found this one at $12: https://www.amazon.com/12V-24V-Step-Down-EN-EL14-EN-EL15-EN-EL21/dp/B07GQK52YP

Another, perhaps better alternative than the last one, provided that a Nikon body does not draw more than 1A of current is a USB 5V to 9V converter (I found a reference to a Canon T3i where live view was drawing 0.5A : https://www.cloudynights.com/topic/540385-dslr-power-requirements/ ) Efficiency of the converters below are listed as 95%. This would greatly widen the choice of battery banks. However it would require the battery bank to be able provide at least 2A, possibly more to be on the safe side. I found two products, both about $8, they are basically just cable with a small lump for the converter, not much clutter as a cable will be needed anyway:
https://www.amazon.com/HeavenLights-DC-Converter-Step-Voltage/dp/B0796R99MN
https://www.amazon.com/KUNCAN-Converter-Step-Voltage-2-1mm/dp/B01ID90E3C  (The 5.5mm plug looks a little short on this one.)

With the plethora of 5V battery banks available at various form factors and at lower prices, one could even afford to try out minimal solutions, and scale up if capacity needs appear to be higher, as long as the 2A current rating is present (which seems to be common).
Řivind Třien

Řivind Třien

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I spent a lot of time selecting a 5V USB battery bank, just to find that when I had made my selection of a popular 16 Ah bank, neither Amazon nor B&H would ship to Alaska, regardless of the capacity of the bank (Even UPS ground has to go by air here). Ended up ordering a charging case for four 18650 batteries (without batteries), equivalent to the Qidian case Jan Anne used and some of the items above + a little more, allowing multiple strategies. Now  I likely have to go and see if I can find the 18650 batteries on the local market...

Considering the difficulty of shipping lithium batteries these days to the US, I would not consider any of the Qidian cases with batteries in the links above. If interest, I can provide details of what specific items I ordered once items have arrived and checked if they work. Hopefully I can get it all operative before the Geminid meteor shower Dec. 14.
Řivind Třien

Seapy

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Geminid meteor shower Dec. 14.

Will this be another opportunity for me to capture another Iridium Flare... LOL   ;D ;D ;D
Robert C. P.
South Cumbria, UK

Jack Dahlgren

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If you are handy with a soldering iron you could put 2 5V packs in series and then a 9V voltage regulator in-line. That would reduce the current draw on the batteries.

Řivind Třien

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If you are handy with a soldering iron you could put 2 5V packs in series and then a 9V voltage regulator in-line. That would reduce the current draw on the batteries.

While I no problems with soldering together stuff or even designing and building circuitry using electronic CAD (it usually gets more expensive than buying ready made stuff), serially connecting Li-Ion batteries without special controlling circuitry can be a risky affair - issues with balancing the discharge of the cells (although it might not lead to a disaster if adequate protection circuitry is present in the battery banks). It would be better to buy a bank with more batteries. Using DC- to DC converters is a safer way to provide the proper voltage.

However I suspect the Tomo battery bank/charger that that has arrived to be adequate based on some preliminary current measurements. The bank takes 4 18650 cells - I got in the Panasonic 3.4 Ah cells from an ebay supplier yesterday (13.6 Ah total), and just charged them overnight+. I am currently testing their capacity with a USB LED lamp that only draws a pretty constant 270 mA, so I will know after 33 hours or so if the cells keep their nominal capacity or is a counterfeit with much less capacity... (A thermocouple logger that I previously designed records temperature of the lamp at 1 min intervals so that I know when it will cut out - a good sign so far is that it initially took more than 12h to charge the banks with a 1A power supply.) That would give me about 49 Wh of energy at room temperature, or with losses in the internal DC converter of the bank + the external 5V-9V DC converter (likely 2 x 5 % loss)  about 46.5 Wh to the camera.

At my current location I also have the option of running extension cables for an overnight event - I have bought parts to allow running both my D7100 and my D5100 at the same time with AC power. Weather forecast is not good though, so I might miss the whole Geminid meteor shower...
Řivind Třien

Seapy

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The mornings of 13th and 14th December are forecast cloudy with rain or snow at my various vantage points in Northern England and Scotland.  >:(

Agree re. adapting or coupling power banks, better to use correct, designed for the job power sources.
Robert C. P.
South Cumbria, UK