[asciimov]

You can find batteries online for under $20. They aren't too difficult to replace if you are patient and take your time. (Easier on 5th gen and earlier iPods). You can even order larger sized batteries if you free up some space with a flash upgrade.

Only big issue with replacement batteries is their quality. None of them will be as high quality as original Apple batteries.

[keyringlight]

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.