After 8 yrs, it is expected the battery health at 70% SOH. If it is repaired / refurbished after 8 years, range will keep on decreasing and car will need frequent charging. It is also important to understand 100% SOH is not possible even after repair / refurbishment as they repair or replace only very week cells/modules. The battery pack in the MG ZS EV gets a warranty of 8 years, however after the warranty period has expired, a battery can be repaired by taking it to the battery repair centres where checks and diagnostics are performed. Full battery replacement is only required if a battery is beyond repair and most of the times it can be repaired by replacing only the weak or defective modules and cells in the future.