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Battery degradation info, 80% vs. 100% daily charge

Posted: Tue Mar 08, 2011 4:44 pm
by barsad22
Hello -
I know that Nissan has not released the tech specs on the battery yet (does anyone know when and if this will happen?), but is there any good information out there about the battery degradation for charging daily at 80%, 90% and 100%? Also it seems murky on how much quick-charging (say five times a week) would damage the battery.
The only information I've seen from Nissan is that the battery will likely lose 20% of its capacity every five years (I'm assuming they mean that will happen even with the "Long Life" (80%) charge schedule).
But I would really like to know how much more capacity the battery will lose over time if you charge beyond the 80%. I've been driving the car for three weeks now and 80% can only safely get you about 50 road miles on the highway.

Thanks,
Josh

Re: Battery degradation info, 80% vs. 100% daily charge

Posted: Tue Mar 08, 2011 4:58 pm
by mwalsh
barsad22 wrote:I've been driving the car for three weeks now and 80% can only safely get you about 50 road miles on the highway.
I only tried charging to 80% the one time, but I got a very definite 60 miles (and probably could have gone 70 miles) with no climate control and 65mph speeds. Now that was a bit too tight for my liking (finished the day with something like 16 miles left showing available, which you always have to take with a grain of salt or two), so I haven't done it since - I figure 100% all the time, and I'll just take the consequences as they come.

Re: Battery degradation info, 80% vs. 100% daily charge

Posted: Tue Mar 08, 2011 5:08 pm
by DaveinOlyWA
with moderate climate controls, i am only getting a safe 70 miles at freeway speeds with 100 % charge. so ya, 50-55 @80% sounds about right.

i only use 120 volt which i thought to be inconvenient due to its slowness, but it now seems to be an advantage. i am simply plugging in before i go to bed and its giving me a 90+% charge which is what i seek 6 of 7 days anyway.

Saturday, i try to be as full as possible because that is our only day off together and that is when we do the most driving. started last Saturday at 9 of 10 bars and still managed 87 miles at street speeds with probably 5-7 miles to spare

Re: Battery degradation info, 80% vs. 100% daily charge

Posted: Tue Mar 08, 2011 5:08 pm
by barsad22
Right, it could be 60 miles without climate control.
But I'm a little worried about "taking the consequences as they come," if the degradation is another 20% in 5 years on top of the disclosed 20%. At 60% maximum battery capacity in 5 years (that may be a worst case scenario), some people's daily commutes will be put out of reach even when fully charged. I hope Nissan can provide some clarity on this point, especially since they didn't really disclose the "recommended Long Life charge" until buyers are on the lot.
Josh
mwalsh wrote:
barsad22 wrote:I've been driving the car for three weeks now and 80% can only safely get you about 50 road miles on the highway.
I only tried charging to 80% the one time, but I got a very definite 60 miles (and probably could have gone 70 miles) with no climate control and 65mph speeds. Now that was a bit too tight for my liking (finished the day with something like 16 miles left showing available, which you always have to take with a grain of salt or two), so I haven't done it since - I figure 100% all the time, and I'll just take the consequences as they come.

Re: Battery degradation info, 80% vs. 100% daily charge

Posted: Tue Mar 08, 2011 6:29 pm
by mwalsh
barsad22 wrote:At 60% maximum battery capacity in 5 years (that may be a worst case scenario), some people's daily commutes will be put out of reach even when fully charged.
So you opportunity charge at work. That was something I figured would be something I should factor into the purchase decision.

Re: Battery degradation info, 80% vs. 100% daily charge

Posted: Tue Mar 08, 2011 7:29 pm
by evnow
barsad22 wrote:Right, it could be 60 miles without climate control.
But I'm a little worried about "taking the consequences as they come," if the degradation is another 20% in 5 years on top of the disclosed 20%.
I'd be very surprised if the battery degrades that much more because of 100% charging. I figure some 5% to 10% in 8 years.

Re: Battery degradation info, 80% vs. 100% daily charge

Posted: Tue Mar 08, 2011 8:26 pm
by sproqitman
mwalsh wrote:So you opportunity charge at work. That was something I figured would be something I should factor into the purchase decision.
Five years from now, with gas at $25.00 a gallon, every gas station will have a charging station. Since no one will be buying gas anymore, they'll be rolling out the red carpet to get EV drivers to come in and buy hot dogs and Slurpees.

Re: Battery degradation info, 80% vs. 100% daily charge

Posted: Tue Mar 08, 2011 9:33 pm
by ENIAC
sproqitman wrote:
mwalsh wrote:So you opportunity charge at work. That was something I figured would be something I should factor into the purchase decision.
Five years from now, with gas at $25.00 a gallon, every gas station will have a charging station. Since no one will be buying gas anymore, they'll be rolling out the red carpet to get EV drivers to come in and buy hot dogs and Slurpees.
But in five years we'll be putting PV car covers over our EVs at work and trickle charging to capacity! No need to to stop in the QuickMart, unless you want to buy a 30 day old hot dog!

Re: Battery degradation info, 80% vs. 100% daily charge

Posted: Wed Mar 09, 2011 10:00 am
by DarkStar
evnow wrote:
barsad22 wrote:Right, it could be 60 miles without climate control.
But I'm a little worried about "taking the consequences as they come," if the degradation is another 20% in 5 years on top of the disclosed 20%.
I'd be very surprised if the battery degrades that much more because of 100% charging. I figure some 5% to 10% in 8 years.
I agree! 5-10% with average use... I will consider the battery successful if I can drive it in @ 10 years and it tests at about 80% its original capacity. :)

Re: Battery degradation info, 80% vs. 100% daily charge

Posted: Wed Mar 09, 2011 11:33 am
by mwalsh
DarkStar wrote:I agree! 5-10% with average use... I will consider the battery successful if I can drive it in @ 10 years and it tests at about 80% its original capacity. :)
That would be awesome.