I have used mine exclusively for over 4 years, the battery lasts the same as amount of time as main fob, you can hide a physical key from the normal fob in the boot of the car and open the boot via app, but no need really as you get plenty of warning of battery running down, like slow response as well as a message on the dash.
I have opened mine and changed the battery myself and resealed it.
If battery were to run down open car via the VOC app on your phone and place fob in the cup holder and car will start.
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XC90 Inscription D5 Power pulse, 2017 MY, Savile grey, Blond Nappa, Leather dash/door tops, Walnut inlays, Dark tinted windows, Air suspension, Bliss/Cross traffic alert, Xenium/7 seat comfort/Family/Winter packs, 4 zone climate, Heated rear seats.
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