Recovery of the SoC after a trip (rebound)

Rebound refers to the recovery of the SoC (state of charge) of a battery after use. The effect occurs more frequently and to an increasing extent in batteries whose SoH has already deteriorated significantly, i.e. in older batteries.

The following diagram shows the rebound effect for a BQ983 battery over 13 months and the SoH range 81-74 %. The kilometers driven, the route profile and the outside temperature (0 - 22 °C in the observed period) do not play a role. The rebound increases, the SoH decreases.

If you notice increasing rebounds, this is an unmistakable sign that the battery is approaching the end of life (EoL).