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Guys, I have an ipod classic 7th gen and I have a 3000 mah battery for upgrade. Does the ipod video thick version back housing fit on my 7th gen classic?

go ahead bruh. 5g thick can be put on 7g . I have done it myself. Go ahead

Yes, are you using a large housing accommodate the battery? That is a huge battery, the normal is 540mAh at 3.7 V. That means your battery is 5 times bigger. Can you post a picture?