The one I got is from a company named Pixel, based in Hong Kong. I got mine from B&H but a Google search pulled up the first one as being offered by Amazon:http://www.amazon.com/Pixel-Vertical-Battery-Nikon-MB-D12/dp/B008F83IVCIt should not void any warranty, the unit is a passive device and has no electronics in it. Nikon's warranty states that abuse and improper repair are subject to causing the warranty but not adding a common accessory.StanSt Petersburg Russia
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