What's the battery life of a plug-in hybrid?

I am thinking of buying a plug-in hybrid. I quite like the Mitsubishi Outlander PHEV, Volkswagen Golf GTE and Audi A3 e-tron. What do you know about battery longevity in these cars?

Plug-in hybrid engine reliability

Over some 35+ years of car ownership I have repeatedly been warned of the dangers of buying old low mileage cars, due to the likelihood that the engine has only ever been run been cold over short journey...

Forthcoming plug-in hybrids - can you recommend them?

My nephew has a BMW 520d company car plus fuel card and approaching change time has calculated at his mileage a plug-in hybrid will save him £5k pa in tax. Being a badge snob an Outlander is not for him...

Real life fuel economy

I have submitted the life-time petrol comsumption of our Ampera three times now (most recently, a few minutes ago), but it does not appear in your results (which are still showing only three submissions)....

Replacement rechargeable battery?

I own a Mitsubishi Outlander PHEV new March 30th 2015. The battery life is fading, and has reduced from 32 to less than 20 miles in 4 months. Is this a common problem? Should Mitsubishi replace the batteries?...