LP-E6 with exactly the same Voltage as the original Canon battery. Rechargeable with the original charger. Maybe you can take a little bit less picture with one full charged battery compared to an original battery.
I've been using them (2x) with a 5D Mark III and a Ikan 7" Field Monitor and they work perfectly well, I had zero troubles, can be charged with the original charger and they last exactly the same as original Canon batteries that cost 6x times.
I use a couple of these batterys on my Canon EOS 70D's Grip. They work just fine. The camera recognizes the level of charge, and they last as much as the original ones.
You definitely need at least one of these as a backup battery.
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