Will your camera power on with a spare battery or through the electrical adapter ? If so then your camera is fine and the problem is your battery!
This is why manufacturers always recommend to use the supplied batteries and recommended chargers only and not some third party junk. This is why you have batteries exploding on people they don't read the warnings.
Yes it is possible to damage your battery - perhaps your battery cannot take a charge - it is NOT normal to charge a battery for a week !
your battery needs a nominal voltage to remain healthy if you allow it to drain below that voltage you have reverse polarity and your battery is good for the garbage bin.
use the recommended charger from now on and get new batteries.
Reverse polarity, I believe only happens with multi-cell battery packs not small single cell pancake rectangular camera batteries.
Some 3rd party batteries don't have overcharge and deep discharge protection, so as DarkStar2 said it could be a hazard. Some do have that protection though, but you can't tell without sacrificing a battery.
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