Cheap generic wall chargers, with no certification etc may not directly damage your precious kindle but they are quite capable of burning your house down. Anything with one end accessing up to 30 amps of mains voltage and not correctly fused/ with no short circuit protection is dangerous. It takes only seconds to start a fire...
As soon as one you are using begins to feel hot to touch, bin it
Before this happens....
https://www.nwales-fireservice.org.u...in-flintshire/