Iām looking for recommendations for a good brand of CR2 Lithium batteries. I use these in my Iris v2 motion sensors.
Thanks in advance.
I just bought some Tenergy CR2 Lithium batteries from Woot, as they offered me a $10 code off of anything I bought on the site. I ordered 50 CR2 batteries for about $24 after my discount code. Time will tell if they are decent quality or not. The order was fulfilled by Amazon, and the expiration date on the batteries is November, 2030. So, at least they have not been sitting on the shelf forever! 
Good luck in your quest!
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I used to buy these for a laser sight. I've been using them for my sensors now. They last a long time. I have an Iris motion sensor that I last replaced the battery in 2018. Still going strong. The batteries are a little pricy.
https://www.amazon.com/Viridian-CR2-Lithium-Battery-3-pack/dp/B0057ILX8S
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I use Titanium Innovations from Battery Junction, or a few other brands from them or another reliable retailer (I've had bad luck on Amazon with non-Amazon sellers) if these are out of stock. Some have lasted over 2 years in my Iris v2 sensors, and I've noticed no difference compared to more expensive name brands.
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I've had success with Amazon Basics.
Sold out on Woot :(. Available on Amazon directly for $50, which is still a good price if they're good quality.
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At 50 cents a piece, I had to give Tenergy a try! 
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Thanks for that! I was wondering about that brand. Just ordered a bunch from Battery Junction. I haven't had much luck with Amazon either.
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I've used tenergy before, both rechargeable & regular, solid performers.
Currently with my Iris V2 motion sensors I am using EBL RCR2 batteries. I get 8months-1 year on the rechargeables, depending on activity level
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Yeah, i like Battery Junction too. But lately I've been pretty frustrated with their "in stock" accuracy. Two orders in a row...in stock turns out to be "in stock 3 months from now" after ive ordered! Grrrr.
S.
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I've switched to using EBL rechargeable CR2s for my Iris v2 motion and contact sensors. (at least for the indoors ones; ones in the garage and outside I still use non-rechargeables)
This has a charger and 8 batteries:
https://www.amazon.com/EBL-Rechargeable-Batteries-Lithium-Battery/dp/B07RGQFBN1
This is just 8 batteries
https://www.amazon.com/EBL-Rechargeable-Batteries-Rangefinder-Boresighter/dp/B07RZRYKGF
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FYI to All. I fried a wink z-wave+ siren using RCR123's at 4.17 volts, instead of the usual 3.6 volt non-rechargeable. The iris motion sensors, so far, don't seem to mind the additional 0.6 volts with rechargeable CR2's. I was prior using Soshine RCR2's which are at the proper voltage, but became hard to find and very expensive(along with everything else)
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Literally just happened to me - went from next week to looking at next month delivery. Thinking about calling and cancelling. 
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I'm going to switch over to rechargeables on my Iris motion sensors - wanted to onfirm no issues w/the rechargeable EBL's not fitting properly, being larger/longer than standard CR2's?
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I've had no problems with them fitting inside my Iris v2 contact and motion sensors.
(That was my concern initially: Deals: Batteries for things (mostly U.S.) - #15 by jlv - Deals - SmartThings Community)
I've bought 40 of the EBL RCR2s at this point, but so far I only have about 8 in use. I have over 80 of these sensors, and they all got new batteries in 2020, so sometime in the next 12 months I expect them all to get used.
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The RCR2 fit well in most devices including the Iris motion sensor. The only problem I had was with the Iris flood sensor, it fit but in removing it I tore the wrapper on the battery
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FYI, Woot Tenergy CR2's are back:
Tenergy CR2 3V Lithium Battery - $34.19 - Free shipping for Prime members https://electronics.woot.com/offers/tenergy-cr2-3v-lithium-battery-5?utm_medium=share&utm_source=app
Edit: Welp, not anymore...
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@scottgu3 , @bertabcd1234 wanted to say at long last I received the batteries I wanted from Battery Junction. Decided to just wait it out and not go for their seemingly "bait and switch" offer.. probably wont be buying from them again.
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This used to not be as big of an issue (probably started in spring of 2020...), but nowadays you do need to pay attention to the ship time/stick dates of their products. Maybe should have mentioned that. A human will often reach out to you offering to swap products for something similar in stock. Sometimes they'll ship things as they arrive (they used to let you choose, without charge; not sure if that's still the case).
None of that has stopped them from being my favorite yet...except time, because if I'm in a crunch then I'll resort to Amazon Prime or Target. But usually... (And I'm hoping the few rechargeable CR2 and CR123A cells I'm trying out might make those situations fewer and farer between. Another story.)
Looking forward to your feedback on that.
I am okay with slipped shipping schedules - just the times we live in. However when an item is advertised as "in stock" then when you go to checkout they say it will not ship for another month and would you consider this other product instead this seems kind of disingenuous. I get that they are probably accumulating orders and bulk purchasing direct from China.. but they should be open about it and the potential shipping dates up front.
After placing my order I received 2 delay of shipping notices - they really did not want me to buy those particular batteries it seems. To be fair maybe I'm an isolated case but I have never had this happen before and first impressions kind of count for a "new" potential vendor. I am less likely to trust them given the overall experience.
