I would recommend this spare battery as an alternative to the original.
The original is indeed outrageously expensive !!
I would like to break no quarrel, if there are more than these battery otherwise ente opinions, but I have had very good experience with him.
It can be loaded with the original charging adapter from Panasonic, and which is also at a time when the originals equal. My Original takes about 1 hour and ca.30min for charging, and this one the same time, +/- a few minutes.
He is also not hot, or even explode !! As I have already read. (Elsewhere)
I've even bought a second, and even this does exactly what it is !!!
Yours sincerely.