Is my calculator dead?

[Strontium]

Hi,

I started charging my HP Prime the other day to top the battery out for when school started. However, since then, it seems that it shows no sign of life. I have ensured that the problem is not my cable, and I started charging the battery when it was nearly full (or, at least, more than 50%) so there should've been power in it anyways.

The only thing that I can think of being wrong is the fact I accidentally charged it using a Samsung "fast charger" instead of a standard USB wall plug.

It's also been suggested that my calculator may have been bricked by OS 10077, however, I have not updated my calculator since I got it and I am fairly sure that version of the OS has never been on it.

Is my calculator dead?