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Nissan reports failure rate of LEAF battery pack in Europe of less than 0.01%

Five years and more than 35,000 European sales since the launch of its all-electric LEAF, proprietary data released by Nissan show that 99.99% of its battery units remain entirely fit for purpose. The failure rate of the battery power unit is less than 0.01 percent—three units in total—a fraction of the equivalent industry-wide figure for defects affecting traditional combustion engines.

Analysis by independent British insurance specialist, Warranty Direct, indicates that 0.255% of vehicles on its books had experienced an issue that led to an immobilization of the internal combustion engine. Common problems ranged from leaks in the coolant system and damage to the head gasket to engine flooding. Data from Warranty Direct is based on analysis of a basket of 50,000 cars aged 3-6 years old over a five-year period.

The Nissan LEAF recorded a 33% increase in sales in 2014 over the previous year, taking more than a quarter of the burgeoning electric car market with 15,098 sales.

The Nissan LEAF launched over four years ago in 2010, as one of the first mass-market, pure-electric vehicles. It is now the best-selling electric vehicle in history, with more than 165,000 LEAF vehicles sold globally.



At about 25 times less failure than ICEs, this is probably a lot less than many posters expected?



Don't you just wonder where all those loudmouths are now that we've had to listen to prognosticate gloom and doom for batteries over the last 10 years? LOL!!!


Dave D:

If current batteries can do 25 times better than ICEs, imagine what future improved batteries, inverters, controllers and electric power train will do.

Coupled with non-rusting aluminum alloy and/or composite bodies, 20+ years trouble free autonomous drive e-vehicles may not be that far away?


I'm just wondering how much of that low failure rate is due to the low demands of performance on the LEAF. Yes of course I know an ICE has all those hundreds of moving parts wearing against each other and that makes them prone to failure. But it seems to me a car tuned for high performance also pushes those part to their limits and invites more failures. So I guess the real question I'm asking is will the failure rate go up if Nissan even makes a battery electric sports car? One where the designers have pushed the batteries to their limits to get that last bit of performance?


The moderate climate of many of the places in Europe where most Leaf sales take place may give them a rather lower failure rate than in more brutal climates such as Arizona, but still a great result though.


Should match age: compared 3~6 year old ICE with 0~4 year old Leaf.
Should match category: compare Leaf with B-class cars.

The battery is logically more equivalent to fuel tank than ICE, Okay, now I'm just being pedantic.

It's fair to compare EV battery to ICE engine, those are the expensive parts that wear out.

Electric motors typically have 100,000 hour Time Between Overhaul TBO vs 4,000 hours for an ICE.

I'm with Harvey on this one. A big win would be extending the life of vehicles by 2x or more.

In case it's not immediately apparent, that is on the order of 5 million miles of driving before you have to overhaul an electric motor. When you do, all you replace is the bearings, very simple vs ICE overhaul.

No wonder some automakers do not want to sell electric cars.


They are obviously making them too well and wasting money.
They should reduce the costs and allow a slightly higher failure rate.
That way, they could sell more Leafs.
I imagine that will happen anyway as they get to grips with battery production.

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