UK Battery Test

[JoeS]

UK iOn test results are very encouraging.

From: http://www.simonbailes.co.uk/news/n...driving-res/4377/newsdetail.aspx#.U90GyyhbpTA

Quoting: "Over the two year trial, the 20 cars covered a total of over 200,000 miles. Battery efficiency ratings were thought to be over 99%- peaking at 99.99%- showing that the electric vehicle (EV) batteries have a drop off level of less than 1%."

Unfortunately, that means that the average for all the cars in this test sample is only 10,000 miles, but, hey, I can live with 1% in 10,000 miles. Presumably they are talking about battery capacity, as "battery efficiency rating" could be construed as Peukert or kWhOUT/kWhIN (battery only) or... hmmm, wonder EXACTLY how they measured this "battery efficiency rating"?

Found this, but haven't the time to pursue further: http://vehicletrial.switchev.co.uk/home.aspx

 

[alohart]

That is impressive, but as Malm has shown, heat seems to be a significant cause of battery pack degradation. Northeast England, where these tests occurred, doesn't experience much hot weather, so I would expect less battery pack degradation than in warmer climates typical of much of the U.S.