A123 over 7000 cycles (10 years) already
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7,000 thousand full charges is more than 14,000 1/2 charges which is about 560,000 miles of all electric driving if 1/2 charge averages 40 miles. I doubt anybody will see even close to this amount before battery reaches 70% of original capacity, but it sure makes 150,000 battery miles sound easily acheivable.
Do you have an idea what A123 calendar life is at 80% SOC and less?
Note that he says "expected battery life of A123's hybrid battery packs".
Hybrid != EV
I do expect A123 to win. You can go out and buy their cells right now in Dewalt tools. Model airplane guys take them apart and stick them in thier planes and rave about them. I read that one guy says they are good for 1000 charges but I wasnt sure what "good" meant. I suppose that if you are racing planes, 95% isnt good enough, however.
Hybrid != EV
I do expect A123 to win. You can go out and buy their cells right now in Dewalt tools. Model airplane guys take them apart and stick them in thier planes and rave about them. I read that one guy says they are good for 1000 charges but I wasnt sure what "good" meant. I suppose that if you are racing planes, 95% isnt good enough, however.
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voltman, Quite a while back I tried to get some real-world data on A1237's cell from the users of those DeWalt power tools you mentioned. I was also hoping someone did some testing and published the data. The only thing I could find were some comments on how they were so powerful and much better than the old technology. I was hoping to hear things like, "Man, I bought one last year and it still works like brand new." Unfortunately, I didn't hear anything like that. Have you found any good studies? With such an important battery chemistry out in full production I expect at least a few people out there to be seriously researching these things.
Something I can answer at least from my use. I upgraded to the Dewalt 36 v series about 6 months ago. Prior to that I would get new batteries about 3-4 months cycling a pair of them. I have used my current pair without noticing any degradation during work. As such I am quite impressed. I'll let you know when i have to finally switch to a new set. Till then I'll keep lurking and hoping the Volt is such a success they adopt it to a 4x4 suv that will hold all my junk. Here's to hoping the Provoq is next(hopefully in a Chevy or GMC so I can get it dirty).
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math problem
7000 full discharges would give you 40 miles * 7000 charge for a total milage of 280,000 miles of all electric. That should give me assuming all electric driving and no ICE use a life time of 19.17 years at 40 miles every single day of the year.
But this figure of 19.17 years is actually short because you aren't likley to use the 40 mile range every day so that could be significanlty longer than 19.17 years. And if you take into consideration that the initial range is probably going to be over 40... probably 50 then the years of service would be even longer.
Not likely to need to try to extend the battery life past 50 years so it sounds like the 50 percent usage of the battery could easily be expanded to probably 75% which would give the current volt an initial range of 75 miles instead of 50. Remember the 40 is suppose to be after 10 years of service not initial range.
Looking more and more like my first REV could have a battery half the size of the volts to serve me just fine. More is better but cost is a big issue right now.
7000 full discharges would give you 40 miles * 7000 charge for a total milage of 280,000 miles of all electric. That should give me assuming all electric driving and no ICE use a life time of 19.17 years at 40 miles every single day of the year.
But this figure of 19.17 years is actually short because you aren't likley to use the 40 mile range every day so that could be significanlty longer than 19.17 years. And if you take into consideration that the initial range is probably going to be over 40... probably 50 then the years of service would be even longer.
Not likely to need to try to extend the battery life past 50 years so it sounds like the 50 percent usage of the battery could easily be expanded to probably 75% which would give the current volt an initial range of 75 miles instead of 50. Remember the 40 is suppose to be after 10 years of service not initial range.
Looking more and more like my first REV could have a battery half the size of the volts to serve me just fine. More is better but cost is a big issue right now.
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