One thing I'd advise from my experience a few months ago upgrading my 6th gen classic, take your time and be careful getting the right parts. Dimensions matter

One thing I'd advise from my experience a few months ago upgrading my 6th gen classic, take your time and be careful getting the right parts. Dimensions matter when it's getting crammed into a case, and for however much I'm not thrilled about apple using their own connectors or needing their software, I appreciate their physical design is elegant for working with their own parts - there's nothing wasted. The iFlash converter I used was for a single SD card, I was only planning on putting in a single SD card so that's all I got as it was the cheapest, and why not get a big huge battery. However, the SD card slot is taller off the PCB than a microSD slot and iFlash only use them on the multi-card JBOD adapters, that makes it conflict with the larger battery if I wanted to keep the slim casing. So then the options are to get a different iFlash, get a different battery that doesn't go into the SD card area, or as I did a new 'fat' 160GB case.