I had the same problem, the Newertech battery swelled and it totally killed the HD, I the HD replaced under warranty after changing back to the original battery.
I then purchased
one of these off ebay.
I also now dont keep the H340 on charge all the time, I Plug it in, charge it, then pull it out of the dock. I think this contrubuted to killing the battery and in turn the HD.
Mind you, the H340 I have is and ex display from where I work and I did leave it running all day for about 3 months.
When the HD's go in these they vibrate badly.