Hello Everyone!

I've just bought an "Anker® Astro Pro2 20000mAh Multi-Voltage (5V 12V 16V 19V) Portable Power Bank External Battery" for my Trio and turns out I should have checked better before getting it. There's no fitting power jack included with the package. It would not be a big problem, I'll just buy a fitting one. But I can't find anywhere what the correct size should be. Pls anyone could help?