Two things that may help - or possibly not.
Firstly, I have a Kindle that has hardly been used since I upgraded to a Boyue Alita. After a couple of years idleness it had a flat battery with a triangle warning symbol like your Mars. With a standard charger it wouldn't come back to life but I do have a smart charging plug that is supposed to monitor the amount of charge according to the requirements of the battery. It can charge pretty fast without damaging anything. The Kindle charged up OK using this one.
Secondly, battery life so far on my two e-readers has been impressive. However, I often use the Alita connected to wi-fi using apps like Word reference and Reverso to read books in a foreign language. In this situation the battery level falls away incredibly fast but that's just the way it is given present technology. I could use the e-reader with a usb cable attached when it is connected to wi-fi.
Anyway, see if you can get it charge up with a better charger. It'll come in handy even if it doesn't work for you in this instance.
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