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New research indicates electric vehicle batteries are designed to drive and recharge for many years, and may well last the life of the vehicle

Electric vehicle batteries research released

New research released mid-April shows electric vehicle (EV) batteries are reliable and long-lived.


As part of the NZ government’s EV information campaign, the Energy Efficiency & Conservation Authority (EECA) commissioned the independent report into EV batteries. The report is by Verdant Vision, an Australia-based EV consultancy, which also co-authored the EV lifecycle analysis.

The research, and a guide based on it, will give owners valuable information about their vehicle’s battery. It will also give confidence and be a useful resource for people considering buying an EV.

“EV batteries are an impressive technology and not everyone realises how long-lived and reliable they are,” says EECA transport general manager Elizabeth Yeaman.
“Manufacturers’ confidence in these batteries is shown by the warranties they offer – now up to 10 years on some vehicles. This report will help owners look after their batteries to get the most out of them. It will also help inform people considering purchasing an EV.”

High reliability

The report found that EV batteries are designed to drive and recharge for many years, with high reliability, and may well last the life of the vehicle. Most new EVs have extensive battery warranties, and EV owners can expect batteries to last well beyond the warranty period.

“Sudden EV battery failure is very rare, and it’s more likely that owners may notice slight degradation over time,” says Ms Yeaman.

There are some simple tips EV owners can follow to maximise the life of their battery, she adds. “There are two ways that an EV battery can gradually fall in performance: through the way the EV is parked and stored, which is known as calendar degradation; or through the way the EV is driven and recharged, which is known as cyclic degradation. EV owners can slow these rates of degradation through some recommended practices.”

These include learning to drive an EV efficiently to minimise stress on the battery – this gives the best daily range, and helps the battery last longer – and to minimise the use of frequent fast charging.

“EV owners should always get their EV serviced by an authorised person and never attempt it themselves,” Ms Yeaman says.

To read the full report, go to www.energywise.govt.nz/ev

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