There are many individuals on this forum who know a lot more than I do about lithium batteries. However, one thing I do know is that the bigger the battery, the longer the charge seems to last. Although the coin cell batteries are very good (Cr2045, CR2032, etc.) they don't seem to last as long as a CR2 or a CR123.
I purchased some time ago, (on eBay), the Centralite (Iris) V2. Great motion sensor, which uses the CR2 battery.
I have been looking for a replacement, because there there are no more Iris Motion sensors to be had.
I have found on eBay a type of Tuya PIR motion sensor. I shall report back on this sensor when I know how it pairs, and how long it lasts. It uses a CR2 battery.
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