The newer, and slightly modified LP-E6N battery was released to coincide with the launch of Canon's 7D Mark II DSLR camera in the back half of 2014. It is marginally more powerful than its counterpart. With a 3.5% higher mAh rating of 1865 mAh versus 1800 mAh for the current LP-E6, it provides higher capacity for each battery charge.
Battery life ratings, according to Canon Inc., show that the EOS 7D, using 50% built-in flash, can achieve 800 shots on a single charge. In the same conditions, the new EOS 7D Mark II can only achieve 650 shots with the same battery. This does not prove a less-powerful battery, but that the 7D Mark II, with its high-resolution and double processors, require more battery life for fewer potential shots, specifically why Canon created a newer battery for the needs of the 7DMII.
More recently, Canon released their new full-frame mirrorless camera, the EOS R, which is compatible with the LP-E6n. We don't have specifics on number of shots per charge on the EOS R, but Bryan over at The Digital Picture posted some initial findings around the release of the EOS R about its battery life. A couple of things to consider about the new mirrorless system is that it's using newer technology than the 7D Mark II did, including an Electronic Viewfinder (EVF) that is standard in mirrorless cameras. These factors are going to play into battery life, and likely drain it much quicker than older DSLR cameras.
The LP-E6N battery has also been manufactured for more safety standards and improved counterfeiting prevention.
The LP-E6N battery was released in conjunction with the EOS 7D Mark II, but is compatible with any Canon DSLR designed for the LP-E6 battery, which includes:
Also compatible with the new Canon battery is the LC-E6 charger, which was originally designed for the LP-E6 battery, and can safety charge the new battery.
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