I can imagine a lot of people won't like the text I've copied from the MG website
It suggests a life span of between 10-20 years
HOW LONG DO ELECTRIC CAR BATTERIES LAST?
Electric car battery life is one of the main factors that makes drivers reluctant to switch to an electric vehicle. The batteries undergo cycles of 'discharge' that occur when driving and 'charge' when the car is plugged in. Repeating this process over time affects the amount of charge the battery can hold. This decreases the range and time needed between each journey to charge. Most manufacturers have a five to eight-year warranty on their battery. However, the current prediction is that an electric car battery life will last from 10 – 20 years before they need to be replaced. Advancements in technology, however, mean that the latest electric car batteries have a longer lifespan than ever before, including the MG ZS EV which comes with a 7 year warranty.
This might seem remarkable when the battery in your mobile phone begins to wear out after only a couple of years, but during that time it might be fully charged and discharged hundreds of times. Each of these so-called charge cycles counts against the life of the battery: after perhaps 500 full cycles, a lithium-ion phone battery begins to lose a significant part of the capacity it had when new.
While a couple of years might be acceptable in a phone, it's not good enough for a car designed to last many thousands of miles, so electric car manufacturers go to great lengths to make the batteries last longer.
In an electric vehicle such as the MG ZS EV, batteries are 'buffered', meaning that drivers can't use the full amount of power they store, reducing the number of cycles the battery goes through. Together with other techniques such as water-cooling systems, this means that electric car batteries should last for many years.
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