As for my Smartphone, I understood that it was necessary to have backup batteries.
Search Amazon. I find an original battery 17. And looking a bit more, I discovered this system similar to the one I use for my Smartphone: an autonomous charger comes with two generic batteries 19.
The choice was made.
I received the product quickly (supply by Amazon). Generic batteries have a capacity of 500 mHa against 700 for the original. They work perfectly in the NPC. When a battery is empty, I refill the charger (red light will turn green when an hour after the battery is charged). So my camera is never locked because reloading.
Conclusion: purchase low price, good quality and increasing my photos taken of capacity.
What more?
One regret: the seller forgot to include the reference in choosing my camera charger 1 + 2 batteries, as he put it in the choice 1 charger 1 battery. I think it's a typo in his announcement on the Amazon site.
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