Finally, 3rd party LP-E17 battery makers are...

Wayne Larmon wrote:

Marco Nero wrote:

I've seen WAY too many house fires caused by non OEM batteries.

A house burned to the ground about 8km away from where I live when a lady was charging a 3rd party Olympus camera battery.

Links please? I have been using non-OEM camera batteries since 2003 an I am not aware of any massive reports of fires caused by non-OEM batteries. I'm sure this would have been mentioned in these forums

Then you either aren't watching the news or you're not aware of the numerous posts here and elsewhere online warning of the problem.  Canon themselves have an archive of exploded non-OEM batteries which they obtain from warranty related lawsuits.  The often present them overseas under glass as a warning to people buying cheap garbage.  The same applies to lenses.  Canon Warranty does not cover non-Canon lenses on a Canon camera.  Canon also advise consumers that "If a problem occurs with a non-Canon lens attached to the camera, consult the respective lens manufacturer."  The same applies to batteries.  Canon won't be held responsible for that el-cheapo battery you bought on Ebay.  Unless it was sold to you by a licensed Canon dealer (which I used to be), you're up a bad creek without a paddle.  There's a protective circuit on a chip inside the OEM battery that tells the charger when to stop charging and when to trickle-charge.  If this chip (on a non-OEM battery) is faulty on not up to standard, the camera will reject it or a fire may be likely since the battery will overheat when charging.  When the battery cell walls are breached an explosion will occur.  Defective or non-OEM Chargers can also pose a risk.  But don't take my word for it...
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Here's the warning on the EOS M6 instruction manual... on page 162.  Using non-Canon batteries that cause a fire or explosion in your camera? Not Canon's problem, and neither should it ever be.

Warranty is also voided with them.

Not in the US. We have the Magnuson-Moss Warranty Act (MMWA) that forbids companies from voiding warranties when non-OEM parts are used. Unless there is specific proof that the non-OEM part caused a problem.

Several months ago the US Federal Trade Commission growled very loudly about companies that have been violating the MMWA.

Canon Warranty explicitly states that they ARE NOT RESPONSIBLE for any damage that occurs to the camera or your property when certain conditions aren't met.  That INCLUDES the use of non-Canon parts.  This especially encompasses NON-OEM batteries - which have continued to pose high risks.  To even suggest that you have an act that holds Canon responsible when IDIOTS use non-Canon batteries, risking fire and death and that this would be considered "acceptable" speaks volumes.  Canon can't control Quality Control (especially concerning the thin cell walls of cheap batteries by in China and elsewhere) and to suggests that the Magnuson-Moss Warranty Act covers consumers in such an event is sheer ignorance of the law.  Here's some images I downloaded years ago.  You can do your own online searches though... that's not my job here.
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Food for thought.
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Additionally, Canon's Firmware updates for cameras have often locked out 3rd Party batteries in the past, rendering them inert or ...forcing you to accept an onscreen option every time you turn your camera on.
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https://www.lightstalking.com/third-party-camera-batteries/

In the US, see MMWA, above.

With all this said, I have found non-OEM batteries to fail by losing their charge earlier than OEM batteries so I end up carrying around a bunch of them so I'm not caught short. Now when I get a new camera, I also get a single OEM spare battery to reduce headaches.

That's fine.  You don't want to spend money on the most dangerous aspect of modern technology.  Have you ever seen a lithium battery explode?  How about one in your top pocket while you're walking.  What about one in your desk drawer while you're on vacation... or next to the television as you sleep in another room?
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Not from a camera...  but a Galaxy Note 7 phone left charging in a vehicle.   The cell-walls were too thin inside the Lithium battery.  This is a shortcut used when creative batteries in China for cameras via non-OEM battery manufacturers.  This fire resulted in Samsung replacing their batteries with another model after 5 similar fires were reported.