Is there any suitable place where I can ask question like why my Kindle is not charging, etc? I have a question regarding the Kindle, but can't guess the right place to ask.
In addition to Glorfindel's answer, Android-based Kindle devices are also on-topic on Android.SE.
We have some tags related to Kindle devices:
My personal observation regarding Ebooks Stack Exchange, while there was a discussion about Should Kindle Fire questions not about reading ebooks be off-topic? with the answer, "yes, they are off-topic", recent questions unrelated to e-books per-se seem to be left opened and answered.