Please add support for an optional 2nd battery to motion and door sensors and really all devices

We use Ring alarm in a vacation home that we don’t go to very often. The batteries don’t typically give “months” of notice before being drained. If ring had sensors that held 2 batteries then the ring devices could feed from the primary battery then switch to the secondary and notify us to swap out the primary this would give a really long time before having to change out batteries. This would be even more useful in the First Alert smoke/Co2 detector that is integrated with ring.