Portable battery power system for DSLR camera

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Description

Experience Level: Expert
I need a simple battery power system to power a DSLR camera for up to a week or two.

We need some sort of DC-DC converter with precision output to whatever voltage and with high efficiency (I saw one of these being used a few months ago and I know that they used a heat-sink to cool down the unit)

I do have a DC-DC converter which i bought off the internet which will give you an idea of what i need (picture attached) i just don't know if its the exact solution that i need.

The DC-DC converter will attach to a standard slow release lead-acid battery which should be no larger than 150AH.

We are trying to power a Nikon D7000 DSLR Camera.
The battery that comes with the camera (image attached) is a 7.0V 1.9Ah battery.
The AC Adapter that comes with the camera (image attached) outputs 9.0V 4.5A.

This AC Adapter doesnt plug straight into the camera but plugs into an adapter which then goes in the battery slot. (image attached) this means that we can use this adapter (which is fairly cheap so doesn't matter if we don't get to right first time) to connect to the DC-DC converter by stripping away wires etc.

I know this is a relatively simple job and we really need to get this done as soon as possible. I have a fair idea of what needs to be done so please price accordingly.

Thanks

Simon

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