Convert Old Sony NPF L Series or LP-E6 Chargers to External Battery Power for Sony A7s etc

If you want to recycle one of your old camera batteries (i.e. Sony / Canon), here's a way to take old cheap generic battery chargers as a good mounting plate. If you were to search for 'LP-E6 Battery Plate', you'd find some options may be bulky and much more expensive over one of these chargers. You can use this method to use Canon LP-E6 batteries to power your Sony A7s, or even Sony NPF L-Series batteries to power your Sony A7s.

diy external battery sony a7s camera

The cleaner way to do this would be to just wire the dummy battery directly to the battery plate, but I still wanted the option to use my AC Wall adapter and so I added a Male plug to my battery plate. Remember although this video shows my Canon LP-E6, you can certainly use a much larger high capacity Sony L-Series NPF-970 Battery instead for super extended run times.

You can find these battery chargers sometimes on auction for just 0.99 Cents via eBay (Found Here).
LP-E6 battery charger plate
find-price-button Canon LP-E6 Battery Chargers

Sony A7s diy external battery

And if you plan to use Sony NPFx Style Batteries, you can find those Sony NPF Battery plates on eBay too (click here).

Sony NPF battery plate
find-price-button Sony L Series NPF Style Battery Chargers

Oh and you'll need the Sony Dummy Battery which comes as part of the Sony AC-PW20 AC/DC Adapter Kit. Here's a few links below:

Sony AC-PW20 Adapter
find-price-button Sony AC-PW20 AC-DC Adapter Charger - via eBay

Sony AC-PW20 Adapter
find-price-button Sony AC-PW20 Adapter - via Amazon

Ok and so if you're a bit weary about figuring out the Negative and Positive wires on a Barrel connector (male plug), these little adapters are PERFECT. Just run your wires directly into the properly labeled areas and tighten down the screw. No soldering required for this 5.5mm OD | 2.1mm ID Barrel Connector (find them here).

5.5 2.5 male adapter dc a7s
find-price-button 5.5mm OD | 2.1mm ID Barrel Connector

18 thoughts on “Convert Old Sony NPF L Series or LP-E6 Chargers to External Battery Power for Sony A7s etc

  1. Allan Bates

    Hi I would like to turn a npf battery into a dummy battery would you know how this could be done? I will be changing to 9v.

  2. Rosemary Bianchi

    Thank you! Thank you! Thank you!

    My situation is quite unique and I'm probably not your typical reader. But, your post was exactly what I needed to find. (Only complaint is that it took me 10+ hours of researching solutions to our problem to find this page!)

    In our schools, we are trying to power a large quantity of robots that take 2.1 barrel plug power inputs. We narrowed down our selection to camcorder batteries with a Lilliput monitor compatible base plate. Tested the solution and it was perfect....until we released the base plates are too wide and too tall to fit where we need them to.

    We will not be making our own base plates using your tutorial. They have a very slim form factor and fit very well. I already soldered a barrel plug onto one and it's running a robot now. It's perfect. And, having our students learn to solder their own base plate will be a great beginning soldering activity to teach them.

    Thanks again for your post. It really did "save the day!"

  3. Popopop photo

    Thanks for the heads up! really appreciated!

    I kinda wonder how is that NONE of th 3rd party battery grip makers do a BG that can fit 2 LPE6 😛 or any other high capacity battery from Sony...

    There's a huge market for this.


    Dear sirs:
    I enjoyed your video on making an external battery for the Sony A7 series cameras from a battery tray.
    I need to know where to buy the female 2.5 mm connector with the two pins that I can solder to and then epoxy to the tray exterior as you did in the video.
    Can you help?
    Thanks so much!!

  5. Dustin

    I just dd this with a sony L battery plate velcroed to my smallhd ac7. Works perfectly!

    Thanks for this tip, em!!

  6. Emm

    Post author

    @Max Brod - Typically black is Negative, but if you look very carefully on the plate you'll see a + (positive) and - (negative) symbol. That will confirm which wire is which. Also if you look very closely on your battery it may also have a + and - symbol which aligns with the battery plate so you can see which one is going where.

  7. Max Brod

    Hi Emm, regarding the black and red wires inside the battery plate which is positive and which is negative? Also do you suppose this would work with LP-E8 batteries, which are 7.2V?

  8. Emm

    Post author

    @Arno - Thanks for the tip. This definitely works with a Sony A7s, but you're right some cameras may not detect it.

  9. Arno

    I tried something quite similar with my GH2 which also works with 7,2v batteries... and it didn't work ! Camera turns on but says problem with that battery. Saw a vid on youtube about that mod and in the comments I learned when you put the AC adapter in the camera it requires 9v (at least 8,5v) to work, so you have to use a 8,4v battery which is not common or 9v power supply. So if it works with the Sony it's good, but be aware it may not always work depending on the camera. 😉

  10. Perfect! I was looking for a way to add run time to my Rebel for long timelapse sequences, but I wasn't liking any of the builds I was finding. These chargers would make for a great way to use the big F970 batteries!

  11. Emm

    Post author

    @TikTak - If the voltage on your Sony battery is about the same as the Canon, then I don 't see why not. I know the Canon AC adapter outputs 8V, but the Canon batteries are 7.2V. So a slight difference in voltage shouldn't matter.

  12. hey, I have a 60D and a wall power adapter with a dummy battery. Plus a large Sony battery with a battery plate. Do you think this method would work for my 60d as an external battery for a rig?

  13. Emm

    Post author

    @Kenneth - The best way is to do a continuity check across the wires and the barrel plug. You can get a really cheap dedicated 'Continuity Tester', or use a Voltmeter. Here's how I do it.

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