MG ZS EV Battery Replacement Cost NZ

The MG ZS EV was one of the more affordable ways into EV ownership when it launched in New Zealand, and the earliest examples are now old enough that battery replacement questions are starting to come up in the workshop. Here's what you're actually looking at, generation by generation.

Two very different generations

Generation	Years	Battery	Real-world range
Gen 1	2019–2021	44.5 kWh	170–200 km
Gen 2	2022–present	51 kWh / 72 kWh	260–290 km / 350–380 km

The gap between generations is substantial. Gen 1 cars used an older, less energy-dense pack with meaningfully shorter real-world range even when new, while Gen 2 brought a genuine step change with two battery options and a notably more efficient drivetrain.

Replacement cost for Gen 1 packs

Gen 1 ZS EVs are now reaching the age where early battery faults are starting to appear, mostly cell-level issues rather than wholesale pack failure. Because MG's NZ EV volumes were modest in this generation, a reconditioned pack supply chain hasn't developed the way it has for the Nissan Leaf. Current replacement costs for a Gen 1 pack:

• New OEM pack, installed: $9,500–$12,000
• Reconditioned pack: not yet reliably available in NZ at meaningful scale
• Cell-level repair (where only specific failed cells are replaced rather than the whole pack): $2,800–$4,500 depending on how many cells need attention — often the more sensible option if the fault is localised rather than general degradation

Replacement cost for Gen 2 packs

Gen 2 cars are still mostly within their original warranty period, so genuine replacement cases are rare. If needed out of warranty, early industry estimates suggest:

• 51 kWh pack: roughly $10,500–$13,500 installed
• 72 kWh pack: roughly $13,500–$17,000 installed

As with most newer EV platforms, expect these figures to come down over time as more packs reach end-of-life and a secondary parts market develops.

Signs your ZS EV battery needs checking

• Range noticeably below what you were getting a year or two ago on the same routes
• Charging that stops early or won't complete to 100%
• A dashboard warning specifically referencing the high-voltage battery or charging system
• Uneven or jerky power delivery under acceleration

Warranty position

MG's NZ battery warranty terms have varied slightly across the ZS EV's lifespan, but both generations carry multi-year, high-kilometre coverage on the battery and drive motor separate from the shorter standard vehicle warranty. If your car is still within that window, a genuine capacity fault should be a warranty claim rather than an out-of-pocket cost — check your specific vehicle's paperwork, since terms improved somewhat between Gen 1 and Gen 2.

Does replacement make financial sense

For a Gen 1 ZS EV currently worth $14,000–$19,000 on the used market, a $9,500-plus new pack replacement is a tough sell unless the rest of the car is in excellent condition and you plan to keep it long-term. Cell-level repair, where applicable, is usually the more financially sensible route for Gen 1 owners facing a genuine fault. For Gen 2 owners, the better battery technology and generally higher resale values make the economics more favourable if a replacement is ever needed post-warranty.

Our recommendation

Get a battery health check before buying any used ZS EV, particularly a Gen 1 car approaching or past the 100,000 km mark. It's a small upfront cost that tells you exactly what you're buying into, rather than discovering a degrading pack after the sale is done.