The battery is an expensive part (i have read €7000) and there is not a lot of experience with the lifespan in the Outlander PHEV. It seems wise to check the condition before buying a used PHEV and luckily this it is very easy with the PHEVWatchDog Android app and an ODB2 bluetooth adapter.
Buy a compatible adapter, because i could not get two cheap adapters properly connected with the WatchDog app. The VGATE icar Pro Bluetooth 3.0 was flawless. It is in the list with compatible adapters on the PHEVWatchDog site and due to the ‘sleepmode’ you can leave it connected without the risk of draining the 12V battery.
Unfortunately i did not know this when i bought my PHEV and i could only check the battery condition later. The first measurement showed 95.8% and this decreased slightly to 94.2%.
Maybe because the previous owner hardly charged the car ? My current total is 128.334 km and the value did not drop further yet.
94.2% is a very good value and i think i was lucky with my PHEV. But if you have found your used PHEV please check before buying !
Below an overview (source: PHEVWatchDog.net) of my battery condition compared to other WatchDog users.