What are you quoting here?CATL 280Ah Battery cell performance
The cell has a maximum cycle life of 12000times = 32.8 years of service if treated right. WOW !
What are you quoting here?CATL 280Ah Battery cell performance
The cell has a maximum cycle life of 12000times = 32.8 years of service if treated right. WOW !
This is probably the spec sheet from the same supplier selling the 420ah cells..?What are you quoting here?
CATL 280Ah Battery cell performance
The cell has a maximum cycle life of 12000times = 32.8 years of service if treated right. WOW !
I laughe at people who convert cycle life to calendar life. Cycle life has nothing to do with calendar life, its strictly cycles. All lfp holds the same Callender life. Regardless of cycles.
They should last for 32 years yet they only warranty them for 3 ?
Cycle life and calendar life are two different things but for our application which is what they are selling those batteries for they will typically get one full cycle per day. You are wrong about all LFPs having the same calander life. That is very dependent on the quality of construction. We have already seen cheaply made LFP batteries leak within the first few months after being sold (see Will's Video) while other have gone way past 10 years.I laughe at people who convert cycle life to calendar life. Cycle life has nothing to do with calendar life, its strictly cycles. All lfp holds the same Callender life. Regardless of cycles.
Have you noticed that in the last 6 months the Trend on cells being sold on Alibaba has been pretty consistent?I know that a while back CATL claimed to have a million mile LIFEPO4 battery for electric vehicles. Tesla is currently using the "million mile" CATL LIFEPO4 battery in some of their electric vehicles in China.
This is one reason its important to always ask for a manufacturer datasheet and basically take with a grain of salt all technical claims made by the seller if they cannot be verified.Have you noticed that in the last 6 months the Trend on cells being sold on Alibaba has been pretty consistent?
6 months ago most said 2000-3000 cycles. Then about 4 months ago 6000 became common. Then 3 Months ago it was 7000 cycles and now it's 12,000 cycles. I suspect that in another two months they will be telling us 20,000 cycles.
It's all about making you spend money with them and not their competitor.
I agree with what your saying. I was just stating that cycle life has nothing to do with calender life. The average Callender life of lfp is 10 years. Yes there are the cases of just a bad cell that prematurely fails.Cycle life and calendar life are two different things but for our application which is what they are selling those batteries for they will typically get one full cycle per day. You are wrong about all LFPs having the same calander life. That is very dependent on the quality of construction. We have already seen cheaply made LFP batteries leak within the first few months after being sold (see Will's Video) while other have gone way past 10 years.
I think this statement can be very misleading. I believe that cycle life - as described by cell manufacturers - is the number of full charge / recharge cycles until the usable capacity has dropped to 80% of its original capacity. For the purposes of discussions here, I think people refer to "calender life" as that same measure, in time. That is, people only care about that same measure translated to calendar months / years. So if I have an application where I cycle the batteries literally every day, if the cycle life is 2,000 cycles, then the useful calendar life of those cells is 2,000 / 365 = about 5.5 years.I was just stating that cycle life has nothing to do with calender life.
I think he is using the average warranty period as many of the battery pack makers offer a 10 year warranty. Who knows what the reality is, these battery packs may last 15 years or more.If I may ask, where does your 10 years calendar life come from?
But that is not what Calendar Aging means at all.For the purposes of discussions here, I think people refer to "calender life" as that same measure, in time. That is, people only care about that same measure translated to calendar months / years.
In other words calendar aging is the aging that occurs at rest and independent from cycle life aging. My understanding is that Cycle and Calendar aging are separate and parallel concepts, which are both in turn affected by a number of different variables.Calendar aging comprises all aging processes that lead to a degradation of a battery cell independent of charge-discharge cycling. (SOURCE)
That's fine, but abusing the cells in terms of storage at high temperature or high SoC will reduce the number of cycles too.But that is not what Calendar Aging means at all.
I don't know how most people here interpret the term, but if they assume it means cycle life in years, they are fundamentally misunderstanding the meaning.
Here is one succinct definition of Calendar Aging:
In other words Calendar aging is the aging that occurs independent from cycle life aging. My understanding is that Cycle and Calendar aging are separate and parallel concepts, which are both in turn affected by a number of different variables.
Two of the main factors leading to accelerated calendar aging are storage at high SOC and storage at high temperature.
What you are referring to (Cycle aging expressed in years) is something different than Calendar Aging, its just a different (and probably very rough) way to express cycle life in units of time rather than number of cycles.