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?

Asked on 9 May 2016 by Grimblet

Answered by Honest John
No reports of failure of the lithium ion hybrid batteries so far. All of these vehicles work best if you do regular sub 20 mile journeys and can charge them from the mains beforehand. The VAG cars work better over long distances at lowish speeds because they have very clever autonomous recharging systems.
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