Snapping iPod together causes battery to drain?

Snapping iPod together causes battery to drain?

I swapped my HDD for a 128gb mSATA SSD using a ZIF adapter. Everything was working (iTunes detected and restored the iPod successfully, it even showed the 120gb capacity) until I snapped the panels back together, then the iPod started getting hot and the battery drained very quickly. I separated the two halves again, and again it started working. I'm not sure what's going on.

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