If I was you, I would be looking to get it replaced with a new one - same brand and model.
I have a Tarot Nano as well and love it.
Regarding the LiPo internal battery thing - I've had numerous phones with LiPo/internal batteries. I've never had one break, not had a port break, not had a battery blow up. The only thing I've had to do is get a new charger cable for my iPods and iPhone once a year, because that's how long there charger cables seems to last. I've since switched to flat style cables with those products, and that eliminated the breakage problem. Oh, I remember a Nokia charger bring murdered years ago, but that was because my bunny chewed through it.
I would be more worried about an unregulated mod and/or loose batteries being carried around than my Tarot Nano.