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With a temperature change to 30-35F, my e-Tron battery charge of 80% is only giving me 142 miles which is 71% of the expected 205 miles. has anyone else seen a drop in battery performance with colder weather?
 

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I can't say that it's apples to apples, but I was used to 2.3 miles/kW at 75 mph in 110 deg F weather a couple months ago and today I was at 1.8 miles/kW at 65 mph in 55 deg F weather. It's not scientific but strange. I expect that the heat pump at 55 deg F is just as efficient as the AC compressor at 110 deg F. I wouldn't expect the resistance heater blocks to be on in the colder mode.
 

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Audi eTron 55 2020. Jaguar iPace HSE 2019.
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With a temperature change to 30-35F, my e-Tron battery charge of 80% is only giving me 142 miles which is 71% of the expected 205 miles. has anyone else seen a drop in battery performance with colder weather?
Completely normal, all EVs suffer reduced range in cold weather. 20-30% reduction is probably pretty much the average. Not helped in practice becuase you also tend to use energy-consuming accessories (lights, heater, wipers, screen defrost etc).
 

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Yep, normal. It should improve as you drive and the battery warms.


Can you try garaging, charging and pre-conditioning prior to departure?
Those are steps I’d take when starting a road trip, or when range is important. Otherwise, no big deal.
 

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Completely normal, all EVs suffer reduced range in cold weather. 20-30% reduction is probably pretty much the average. Not helped in practice becuase you also tend to use energy-consuming accessories (lights, heater, wipers, screen defrost etc).
is this because the heater will be on? and by 20-30% reduction you mean as compared no heating on and heating on?
 

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No, the battery efficiency and capacity is pretty strongly affected by temperature. Cabin heating is an additional loss. Batteries will take up maximum charge and will discharge with maximum efficiency at a temp of around 70F. Both of those drop as the ambient gets warmer or cooler.
 

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No, the battery efficiency and capacity is pretty strongly affected by temperature. Cabin heating is an additional loss. Batteries will take up maximum charge and will discharge with maximum efficiency at a temp of around 70F. Both of those drop as the ambient gets warmer or cooler.
even when it gets warmer? I thought this was just a cold issue... makes sense now.... I checked a couple of cars in the summers and the range showing at 100% was less than what I saw a car today at 90% charge

in the summers the temp was about 110 F and right now the temp is 60 F. So I guess weather is the factor.
 

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Yes, especially as it gets warmer! The falloff in efficiency/capacity is actually worse on the high-temp end of the plot, than on the low. That's why Audi put so much effort into thermal management for the battery.
 

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even when it gets warmer? I thought this was just a cold issue... makes sense now.... I checked a couple of cars in the summers and the range showing at 100% was less than what I saw a car today at 90% charge

in the summers the temp was about 110 F and right now the temp is 60 F. So I guess weather is the factor.
The batteries will be a lot happier at 60F than at 110F
 

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The batteries will be a lot happier at 60F than at 110F
Well where I live the temp is mostly 95-110 F (Major part of the year). Will this deteriorate the battery faster than it would in a tropical climate ?
 

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Well where I live the temp is mostly 95-110 F (Major part of the year). Will this deteriorate the battery faster than it would in a tropical climate ?
Based on the available data, charging the vehicle while it is in ambient temps this high, and letting it sit with a full charge in this type of heat are the worst things you can do as far as battery degradation.
If I were you I'd follow the 80% charge rule Audi recommends, and if you are charging to 100% for a trip or something, don't do it long before the trip. Set it up so it's only sitting at 100% for a few hours.
 

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@Sammk Granted, you are not letting the vehicle sit at 100% for a year, but it is clear that lithium-ion does not like to be fully-charged in high temps.

835
 

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Based on the available data, charging the vehicle while it is in ambient temps this high, and letting it sit with a full charge in this type of heat are the worst things you can do as far as battery degradation.
If I were you I'd follow the 80% charge rule Audi recommends, and if you are charging to 100% for a trip or something, don't do it long before the trip. Set it up so it's only sitting at 100% for a few hours.
thankyou for your insight. I shall definitely keep it at 80% and not let it sit at 100%for long.
 

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You might find this document of interest, particularly page 131:
https://static.nhtsa.gov/odi/tsbs/2019/MC-10155750-9999.pdf

At temperatures above 95 deg F, the car starts to actively cool the battery. I would think that would translate into an additional drop in mileage. (Elsewhere in the document it seems to say active battery warming does not start until the temp drops below 14 deg F--except during DC charging)
 
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