I think routing cameras via Hubitat is a terrible idea. Those are memory hogs, streaming, high frame rate, large image size…
Leave it as is 
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I just had to replace the battery in one of the door and window sensors for the first time. It had been in there 6 years.
Yeah sometimes one gets good batteries with the sensors.
After I replaced the originals I never got more than say 2 years with any sensor
Like the newer Ecobee room sensors, these contact/motion sensors use CR2477s. Ecobee said they should last 5 years... and they surpassed that.
The downside is that they are a big bulky.