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Old Jul 18, 2002, 8:25 PM   #1
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Default Power Pack for Nikon 5700

I posted this before in the thread about Whither 8.4 volts?

Why does the voltage input on the Cpix 5700 require 8.4 volts while the battery pack only delivers 6 volts?

I would like to be able to use 6 volt battery packs as an external power supply!
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Old Jul 18, 2002, 8:48 PM   #2
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Even though the internal EN-EL1 battery pack is 6V the optional MB5700 battery grip can be loaded with 6 AA @ an average of 1.4V (under load) making it 8.4V max as the camera rating... I suspect any 6V external battery will work just fine and if one go by the absolute max rating of AA in open circuit, it can top out @ 9.6V for 6 cells!

Like most electronics running on fluctuating batteries an internal regular will bring the voltage to the proper level required by the camera...
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Old Jul 18, 2002, 8:56 PM   #3
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Actually NiMH's max out at 1.2 volts. So four NiMH=about 6 volts and most six volt power supplies are rated at six volts. I have not seen any external power packs rated at 8.4.
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Old Jul 18, 2002, 9:05 PM   #4
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I'm referring to standard Alkaline which can also be used !!! (0r any AA cells out there between .8V to 1.6V) NiMh is just 1 type which is perfect for camera use, but the design will accomodate any...

On the D7i 4 Alkaline might make it 6V, but the camera will use it up in a jiffy, hence Nikon upped it to 6 (ie at least 9V) to make these battery type at least useful when you'll run out of charge

[Edited on 7-19-2002 by NHL]


PS. Ever thought of using an R/C car batteries? theses are D cells and all you'll need is a removeable adapting harness to the camera and a cell phone holder (and it cost less than a Maha/Powerex)!

[Edited on 7-19-2002 by NHL]

... or you could pack your own... It sure beats the cost of the DCB !!!

[Edited on 7-19-2002 by NHL]
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Old Jul 19, 2002, 3:31 AM   #5
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Yes, I have thought of a roll my own, or just putting six NiMH into a holder. That would be ther equal of the Nikon adapter...is 7.2 volts adequate?
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Old Jul 19, 2002, 6:18 AM   #6
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It should be plenty like I said:

Quote:
...an internal regular will bring the voltage to the proper level required by the camera...
Most portable digital processors run out of 3.3V, 2.5V, or even 1.8V these days in order to reduce the power consumption. I can assure you that no digital electronics run at anything higher than 5V even in it's early day...

Every digital camera got to have an internal switching regulator circuit so it can work of fluctuating batteries as they discharge !!!


BTW they do sell 'hump back' 7 cells R/C batteries that'll provide 8.4V, but I don't think you'll need it...

[Edited on 7-19-2002 by NHL]
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Old Jul 26, 2002, 12:49 AM   #7
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Default I dun it!

I built my NiMH battery pack for my 5700 ... works out fine!

I bought about $15 worth of parts at RadioShack ... 3 2 AA holders, 3 9volt style snap on connectors, 1 coiled modular cord, 1 modular connector with free wires and one size B head.

I also bught a nice little belt bag for $6 at Fred Meyer to hold it all!

Looks very neat, gives 8.4 volts at 1800 mAH!

What more could a boy want?
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Old Jul 26, 2002, 7:24 AM   #8
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Good Job!

That's more power than the Maha Powerex for less, and even significantly less than a MB5700... (may be Nikon should take a hint)
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Old Jul 26, 2002, 9:27 PM   #9
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Yeh ... esp when Nikon's 6volt thingy is seling for $200!
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Old Jul 28, 2002, 4:49 AM   #10
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FYI, Check this guy out (courtesy of Kcan):

http://www3.sympatico.ca/akouzmit/Battery_Pack/

With 8.4V (7 cells) version, it's more power than the DCB for less.

http://www.robgalbraith.com/diginews...06_08_dcb.html

[Edited on 7-28-2002 by NHL]
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