Yes, you can short it without damage.
Having said that, mine went NUTS two days ago. Would go white-screen after only a couple minutes, claimed random charge% the entire time it was on, would shut off and then come back on, then refuse to shut off…
I had finally had enough and opened the case. When I removed the bottom plate, something fell out and bounced off my desk. I was never able to locate it but, looking at the board, I couldn’t see anything obviously wrong with it (was hoping for a cold solder joint, bad assembly, something. Nope. Everything looked peachy. I tightened the nuts that retain the RF connector and rotary switch and put it back together.
Hasn’t misbehaved since, though the battery meter still appears to be complete BS. From the sound of the thing that bounced off my desk, I think it was a piece of metal laying in there and occasionally making contact with stuff it shouldn’t, but I have no evidence of that.
It’s still unreadably dim when not plugged into something, but since I can’t trust the battery meter, I’m using an external USB power pack (yes, another Tecknet product. 19200mAh pack p/n: BT1800. No, I don’t own stock in them. No, I’m not an affiliate. I genuinely like their power pack.) just to keep the backlight on and make it so I don’t have to guess whether the thing has discharged it’s battery again.
I’m going to have to buy another one eventually. Not looking forward to it, but I need it.