Do a search:
"replacement SSD and battery for IPOD 7th gen?"
This will return results ranging from a set that will fit your device "as is" with lower capacity batteries, as well as kits that contain a replacement back cover that allows space for a higher capacity battery, if you are willing to do that, (I've done that with PPCs, Phones and so on several times. think about whether the added thickness (and weight) of the device will bother you, if not, and you want that extra operating time then go for it. If possible read the customer reviews before deciding which one to go with, quality varies. Also, it looks like your device can accept up to a 2 TB SSD, you can also try searching for only the battery kits and SSD individually to potentially see more options.
Good Luck!
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