...are now hitting the market from suppliers that I have purchased from in previous years (the following screen grab is from Amazon USA):

By my own lazy count I have purchased at least a couple of backup batteries (from all three of the above suppliers) for at least ten different cameras (including two point-and-shoot, three DSLR and five mirrorless Canons)...with, I guess, mostly positive results for most use cases.
Currently, the fan-less and ethernet-less grip for the R5MkII is more-or-less permanently attached to its body, mostly because of its ability to house an additional battery--if anyone has figured out why my R5MkII seems to consume power at quite rapid rates...let me know.
Weather is warming up, and in some situations I can imagine needing backup batteries for the two Canon-branded batteries that now reside inside the grip.
I found this...
www.canonrumors.com
...on CR but haven't seen much on the Neewer, Wasabi or Kastar versions of the LP-E6P batteries--but I'm still looking.
Of course there are worries about third-party battery usage and damage to the camera itself...so I'm a bit conservative jumping in until more reviews are available.
EDIT:
...missed this one (for the Neewer R5 batteries):
www.canonrumors.com

By my own lazy count I have purchased at least a couple of backup batteries (from all three of the above suppliers) for at least ten different cameras (including two point-and-shoot, three DSLR and five mirrorless Canons)...with, I guess, mostly positive results for most use cases.
Currently, the fan-less and ethernet-less grip for the R5MkII is more-or-less permanently attached to its body, mostly because of its ability to house an additional battery--if anyone has figured out why my R5MkII seems to consume power at quite rapid rates...let me know.
Weather is warming up, and in some situations I can imagine needing backup batteries for the two Canon-branded batteries that now reside inside the grip.
I found this...
Patona LP-E6P batteries are fully compatible with the R5II
I took the gamble of buying Patona branded versions of the LP-E6P and LP-EL this weekend and they arrived today. The LP-EL works fine in my EL-5 (which luckily doesn't drain batteries overnight) and the LP-E6P works in the R5II. The R5II detects it as an LP-E6P, I can register it in the camera...

...on CR but haven't seen much on the Neewer, Wasabi or Kastar versions of the LP-E6P batteries--but I'm still looking.
Of course there are worries about third-party battery usage and damage to the camera itself...so I'm a bit conservative jumping in until more reviews are available.
EDIT:
...missed this one (for the Neewer R5 batteries):
Third party LP-E6NH equivalent batteries
I am going on a birding safari with my wife next month when we will be spending a long time each day in the field and will need a good supply of batteries for our R5 and R7, which do eat them when using telephotos. We have two spare Canon LP-E6NH but that could leave us caught short. The price...

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