The battery part number shown in one of the pictures and what is in my tablet is C11Pn9H. I ordered a Cameron Sino C11P1304 from Amazon that states it’s compatible with a C11Pn9H. It really is not. It’s smaller and the power conector is 1/4” inch away from the corner. I’m sending it back.
I found and ordered on Amazon a DGTECH C11P1510 battery that also states it’s a compatible battery for the Asus ZenPad S 8.0 Z580C Z580CA Z380C Z380C and looks exactly the same as the C11Pn9H but it costs more. $39.99 compared to the Cameron Sino for $23.89. Ouch! almost double the price. Also 1 Year Replacement Warranty as the Cameron Sino battery.
I just received the new replacement USB port today 3/22/17. I bought it on eBay for $3.29 including shipping and took a week to get it. Everything worked out fine. The tablet receives power and charges now. I ended up using hot glue to secure the case frame to the rear of the case. When snapping the screen back on to case frame you may have to squeeze the case and the screen very hard and at the same time force the frame to snap into place.
I'm currently working on this tablet. My friends' kids screwed up the USB port and has part of the connector inside the port missing. Somebody had pried the back of the case open breaking off all of the tabs that are melted down to secure the frame of the case better. There are tabs left that snap the frame to the back but there are places along the edge that show a gap and will now have to be glued to eliminate the gaps. So only pry the case/frame off along the edge of the screen using an iFixit opening tool.
I would not remove the back of the case. There are around 14 tabs inside that are melted down to secure the frame. Those melted tabs will break off and the back won't be as secure and the edge of the back will have have a visible gap showing. I would remove the case from the screen side as in step 5 of this tear down and use a iFixit opening tool. Use the tool with handle towards the screen to pry the frame away. Start on one long edge and slide the tool along the gap and at same time slightly pry the case away. Then separate a short edge. The corner between the 2 open gaps should just pop away with some prying. Do the same with other 2 edges and corner.