I was looking through the accessories for the Mavic and found the Advanced charging hub along with the charger for the Phantom 4 will charge your Mavic batteries in almost half the time that the system that came with the Mavic.  The upgrade would be about $120+.
While this seems like a great idea in my experience the faster you charge a battery the less life it will have in the long run.  I am not a battery guy so what do you think will happen to these batteries if charging them that quickly?  You can use the fast charge only when needed but is it going to cost me in the future?
Worth it or not?

I was looking through the accessories for the Mavic and found the Advanced charging hub along with the charger for the Phantom 4 will charge your Mavic batteries in almost half the time that the system that came with the Mavic.  The upgrade would be about $120+.
While this seems like a great idea in my experience the faster you charge a battery the less life it will have in the long run.  I am not a battery guy so what do you think will happen to these batteries if charging them that quickly?  You can use the fast charge only when needed but is it going to cost me in the future?
Worth it or not?