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Hybrid Battery Test

Battery care

Heat and where you park

Established

Heat is the one factor with no argument attached. Hot climate cars degrade about 0.4 percent a year faster.

At a glance

  • Verdict. Established
  • Evidence. Peer reviewed research plus fleet data
  • Applies to. Any lithium pack unless the page says otherwise
  • Cost to follow it. Nothing

The detail

Park in shade where you can and avoid leaving the car at 100 percent in summer heat. High state of charge and high temperature compound rather than simply adding, which is why the combination is worse than either alone.

Source. Study linked. Read 16 September 2026.

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