20:43 06-11-2025

How plug-in hybrid batteries age: ADAC data, brand results, and charging tips

ADAC and Aviloo analyzed 28,500 SoH checks and found plug-in hybrid battery aging depends on brand and use. See brand trends, SoH benchmarks, and charging tips.

Germany’s ADAC has published a study indicating that batteries in plug-in hybrids age unevenly, with results shaped by the manufacturer and how the cars are used. Working with Aviloo, specialists examined more than 28,500 state-of-health (SoH) assessments across six brands. The takeaway is hard to miss: day-to-day charging and driving habits can matter just as much as the badge on the grille.

The strongest results came from Mercedes-Benz, whose packs showed minimal capacity loss. Volkswagen and BMW models generally stayed within expected limits, though there were isolated exceptions. Ford hybrids tended to shed capacity faster at first before the decline slowed over time. The most troubling figures were seen in Mitsubishi, where wear appeared early in a car’s life. Not all plug-in hybrids age alike, and this spread makes careful evaluation essential.

ADAC advises anyone shopping for a used car to check battery condition. For vehicles with 50,000 km, SoH should be at least 92%; by 200,000 km, no less than 80%. Experts also recommend avoiding full 100% charges and keeping the battery between 20% and 80% to prolong service life. Simple rules, but they give buyers a clear yardstick and owners an easy routine to follow.

ADAC adds that if frequent electric-only trips are on the agenda, modern battery-electric cars may be the smarter pick, as they go through fewer charging cycles and tend to last longer. In practice, it’s a straightforward choice: align the powertrain with daily use, and the battery will have an easier life.