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 My Power Solution - Small, Simple, Efficient 
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Joined: Fri Apr 02, 2010 2:10 pm
Posts: 111
Location: Kent, England
Post My Power Solution - Small, Simple, Efficient
After reading the forum for advice on various power solutions, I have finally made mine.

I don't claim to have created anything new, but I thought I would share it with you.

To keep things simple, and avoid the inefficient AC to DC conversions, or even DC to DC (voltage change) I went with a high capacity 7.4V 7800mAh battery. Which is also smaller and lighter than an SLA battery.

This is the same voltage my camera uses (making thing easy and 100% efficient), and over 10x the capacity!

I made the classic fake battery from a cheap battery, used some extra flexible silicone wires and Kyosho / Tamiya connections for one part. And used the Lenmar adapter plates, drilled into it and connected it directly to the terminals, and put a connector on the other end.

Total cost was:

Small Battery - £6
Large Battery - £18
Universal Charger - £10
Wires - £3
Connectors - £4
Lenmar adapter plates - $3.60

My old 720mAh battery would last about 3 hours with the shutter open for long exposure timelapses, the 7800mAh battery should last over 30 hours for this, and even longer for shorter exposures. Not tested to extreme yet, just a few hours out and about which worked great.

I also have a regulated DC to AC adapter to use form mains power, which connects to the fake battery via the same connectors.

Thanks to Antz and flyvholm for the advice!


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Thu Jun 17, 2010 3:53 pm
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Joined: Tue Jul 08, 2008 12:36 pm
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Location: Antarctica/California/New Zealand
Post Re: My Power Solution - Small, Simple, Efficient
Nice and simple, and lightweight.

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Thu Jun 17, 2010 4:10 pm
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Joined: Fri Apr 02, 2010 2:10 pm
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Location: Kent, England
Post Re: My Power Solution - Small, Simple, Efficient
Antz wrote:
Nice and simple, and lightweight.


Sure is :-) thanks again for the advice!


Thu Jun 17, 2010 4:26 pm
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Joined: Wed Jul 09, 2008 11:54 pm
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Location: Aars, Denmark
Post Re: My Power Solution - Small, Simple, Efficient
Hey, that looks so familiar :-) Enjoy and thanks for posting photos!

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Fri Jun 18, 2010 4:44 pm
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Joined: Sat Apr 17, 2010 4:08 pm
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Location: Los Angeles, CA
Post Re: My Power Solution - Small, Simple, Efficient
This is a simple and effective solution, bravo! What is the number of the large battery? I have been looking at the 3rd party battery for the sony NP-F970 but it's a bit smaller at 6500 ma,

cheers

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Sun Jun 20, 2010 10:45 pm
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Joined: Wed Apr 21, 2010 11:26 am
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Location: Germany, Munich
Post Re: My Power Solution - Small, Simple, Efficient
Excellent.
Very simple and easy, I like it. Thanks for posting!
I would be interested in the battery model too.

Best Regards
David

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Mon Jun 21, 2010 12:11 pm
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Joined: Fri Apr 02, 2010 2:10 pm
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Location: Kent, England
Post Re: My Power Solution - Small, Simple, Efficient
flyvholm wrote:
Hey, that looks so familiar :-) Enjoy and thanks for posting photos!


Haha I'm sure it does! :D thanks again for the advice and links! Major credit to you. Thanks :D


Mon Jun 21, 2010 4:34 pm
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Joined: Fri Apr 02, 2010 2:10 pm
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Location: Kent, England
Post Re: My Power Solution - Small, Simple, Efficient
Thanks a lot guys, I'm glad you like it!

The battery is a third party Canon BP-970, BP-970G.

I bought it from Amazon UK for £18, PowerPlant branding. http://www.amazon.co.uk/gp/product/B002 ... B002QVZWAE

In the US I found the same equivalent model, with a 8000mAh rating for $37. Looking at the photo it looks the same at the base (the sticker). http://www.amazon.com/gp/product/B000M5 ... B000M51CGE

Also used the Lenmar XPA1/S Universal Adapter Plate
http://www.amazon.com/gp/product/B000IZ ... B000IZ0FP2

Hat tip to flyvholm!


Mon Jun 21, 2010 4:42 pm
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Joined: Sat Apr 17, 2010 4:08 pm
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Location: Los Angeles, CA
Post Re: My Power Solution - Small, Simple, Efficient
Thanks for the info. Good for the future, my current project I am using Sony NP-F970 batteries.

Found them here:
http://cgi.ebay.com/2-Battery-Charger-S ... 986wt_1185

2-7400 mah battteries plus charger!

I have some other Sony L batteries so these seemed like a good idea.

I am building 3 stereo timelapse rigs so I needed a bunch of these, seems like a great deal.

Thanks

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Tue Jun 22, 2010 7:48 pm
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Joined: Fri Jun 25, 2010 2:21 pm
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Post Re: My Power Solution - Small, Simple, Efficient
Hey this is a great thread! Nice work.

Reading the comments, it sounds like this is a standard technique, but I am not having luck finding other threads ... anyone have any links they'd care to share?

I'd like to do something similar for my Pen E-P1, which uses the 7.2V Oly BLS-1 battery. Some 7.4V batteries I'm finding suggest they are compatible. Can anyone help me understand what I'd need to do to set up a similar external power battery for my Pen? Can I run with a 7.4V battery pack, or will I need to regulate voltage? If the latter, any suggestions on high capacity 7.2V cells? I'm only finding 7.4V cells.

Hope it's okay to tag on .. didn't seem like it was worth starting a new thread on this same topic.

-b


Tue Jul 06, 2010 9:27 am
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Joined: Wed Jul 09, 2008 11:54 pm
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Post Re: My Power Solution - Small, Simple, Efficient
Huh - doesn't look like the E-P1 supports AC power adapters at all, so you're forced to do a hack to have it run longer than the internal battery lasts. One problem you will run into is that you need to have a wire exiting the battery compartment in the camera (Canon DSLRs have the wire exit built in because this is how their own AC adapters work), so you may need to cut/drill a hole in the cover. Apart from that the procedure should be the same: Find a cheap replacement battery (e.g. on eBay), cut it open and remove the cells, solder wires to the terminals and run those wires to your external battery pack, optionally with a connector in between for flexibility. I'd say that 7.4V batteries ought to work fine since battery voltage varies anyway and the camera needs to be able to handle that. There are some lower capacity 7.2V options, the best I could find are JVC BN-V428U, Sony NP-F730 (or rather, cheap equivalents for these found on eBay) and Lenmar LIC924. If it was me I'd go ahead with the higher capacity 7.4V batteries though as it is very likely to work just fine.

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Tue Jul 06, 2010 6:15 pm
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Joined: Wed Apr 21, 2010 11:26 am
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Location: Germany, Munich
Post Re: My Power Solution - Small, Simple, Efficient
Hi,

I would not worry about the 0.2V difference.
I measured the voltage on my battery that is rated with 7.4V, when almost fully charged the battery was at 8+V, so obviously cameras can handle a wide range of input. With a 7.4V battery you should be able to run your camera even longer than you might expect based on the Wh, because the battery can sustain to stay above the critical voltage (should be somewhere around 7V) where you camera shuts off.

Best Regards
David

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Tue Jul 06, 2010 11:38 pm
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Joined: Fri Jun 25, 2010 2:21 pm
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Post Re: My Power Solution - Small, Simple, Efficient
Thanks for the info/encouragement! I'll pick up some supplies and give 'er a go.

The E-P1 does not care whether the battery door is open or closed -- so on a tripod, which is the only place I anticipate using these external power supplies, I'll just leave the battery door open while I'm shooting.

Guess I'd better go collect my pieces.


Wed Jul 07, 2010 7:02 am
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Joined: Tue Dec 21, 2010 4:54 pm
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Location: Rochester, NY
Post Re: My Power Solution - Small, Simple, Efficient
Thanks for this post! It is an awesome, lightweight, and easy power solution that has been working phenomenally for me. My basic set up is the same, but the way I charge it is a bit different due to the Lenmar Adapter plates I purchased. If anyone is interested, I can try to post up a summary with pictures. I've been shooting in sub-freezing temps (usually anywhere from 5-25 degrees F without windchill) with no problem, but I have been using chemical handwarmers as a means of keeping the battery warm. (Haven't tried without it, but I don't want to risk loosing a shot.)

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Mon Feb 14, 2011 8:30 am
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Joined: Sun May 15, 2011 3:20 pm
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Post Re: My Power Solution - Small, Simple, Efficient
This can be monetised! I'd happily pay for a product like this :)


Sun May 15, 2011 4:15 pm
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Joined: Wed Jun 02, 2010 2:41 pm
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Post Re: My Power Solution - Small, Simple, Efficient
Are the attachment pictures for this thread all garbled for everyone else? There is some seriously bad color banding in the pictures making it impossible to see what was photographed. I've check in firefox and I.E. and no luck.


Wed Oct 19, 2011 6:40 pm
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Post Re: My Power Solution - Small, Simple, Efficient
Yep, they're garbled here too, and they aren't the only ones. Perhaps the files have been damaged in one of the forum crashes we've been through. It emphasizes that it's a better idea to host the images elsewhere and link to them rather than uploading/attaching them to the post itself. :-|

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Wed Oct 19, 2011 7:47 pm
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