This 2.5mm DC to L-Series Dummy Battery Cable from IndiPRO Tools is a 24", 7.4V regulated cable that lets you power various cameras and devices that use an L-series battery. It's compatible with power sources with a 2.5mm barrel connector and up to 19V, 5A output, which gets regulated down to 7.4V. The cable is polarity-tested to prevent the risk of crossed polarity when powering your camera.
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First, the "dummy" battery is ever so slightly tight for my Atomos Ninja (it was a suggested accessory by B&H) - I can squeeze it into a battery slot, but it's so tight I needed a hammer to get it back out. Next, the actual power doesn't even get to the battery, so not sure what's wrong - the DC-DC converter must be DOA. Too bad, because this thing could be useful, but it simply doesn't work. At all.