Backup battery for EOS 6D

I use this battery backup on my canon EOS 6D.
I did not see any difference from my original battery.
There may be one, but it requires them to pay particular attention, demonstrating in itself, if there is deviation, it is not huge.
Some comments indicate that the battery discharges when the 6D is off. It's not at all the case for me, I can leave the battery in the device two weeks without touching it, I find it full and functional. Of course, I turn off the GPS when I know I will not make use of the device. It is running even when the power is off, the battery would empty it is canon or generic.
In summary: top battery and ultra competitive price! I highly recommend.