4 ms·

How do those batteries fare in terms of capacity loss over time ? My li-ion rechargeable sanyo eneloops AAA batteries seem useless after a couple of years.

imtringued 7y ago
It depends on the depth of discharge and heat management. Laptops, phones, etc have a poor lifespan because they are frequently discharged from 100% to almost 0%. It is better to discharge them from 100% to 50% and then recharge. Batteries generate heat during charging and smart phones can get hot during heavy use. Without good enough cooling the lifespan of the battery drops.
- zaarn 7y ago
  It also helps to charge them more slowly, so in case of solar farms, you can increase the lifetime of a battery by using more of them and charging them more slowly. Discharge is slower as well, which also benefits lifetime.
- StreamBright 7y ago
  Usually the best case scenario is 80 - 20 as far as I know.
  - ohduran 7y ago
    I've heard the opposite! Any piece of information that you can share to back it up? Highly interested.
    - StreamBright 7y ago
      Sorry I have studied this in other language and I not even sure how these things called in English. There is one graph that I remember called Woehler curve and there is another one that shows how much is the life expectancy operating between different charging levels (which I cannot find the name for). https://www.researchgate.net/figure/Woehler-curve-for-lithium-ion-battery_fig2_275258416 https://www.researchgate.net/figure/Woehler-curve-for-lithiu... Update: It is called SN curve: https://www.researchgate.net/figure/SN-curve-applied-to-battery-lifetime-estimation-Number-of-cycles-in-function-of-depth-of_fig7_249322820 https://www.researchgate.net/figure/SN-curve-applied-to-batt... It shows a bit different picture for Li-ION that I remembered.
      - hakejpc 7y ago
        The reading I did years ago stressed that you should definitely cycle batteries to as close as Zero as possible, but if you want to do long-term storage keep them at 40%. Seems like there is a lot of myth around how batteries work and proper practice. A unified resource on this would be great!
        aeternum 7y ago
        Depends on the battery chemistry. NiCd and NiMh batteries which were very popular 10+ years ago do have a memory effect: https://en.wikipedia.org/wiki/Memory_effect https://en.wikipedia.org/wiki/Memory_effect LiPo batteries do not have a memory effect, and you should avoid deep discharges.
        StreamBright 7y ago
        I think the linked study gives you some insight. The problem is that we need all the capacity we get using a mobile phone for example. You can't really have a 2x capacity battery just for the ideal life time unfortunately.

imtringued 7y ago

It depends on the depth of discharge and heat management. Laptops, phones, etc have a poor lifespan because they are frequently discharged from 100% to almost 0%. It is better to discharge them from 100% to 50% and then recharge. Batteries generate heat during charging and smart phones can get hot during heavy use. Without good enough cooling the lifespan of the battery drops.

zaarn 7y ago
It also helps to charge them more slowly, so in case of solar farms, you can increase the lifetime of a battery by using more of them and charging them more slowly. Discharge is slower as well, which also benefits lifetime.
StreamBright 7y ago
Usually the best case scenario is 80 - 20 as far as I know.
- ohduran 7y ago
  I've heard the opposite! Any piece of information that you can share to back it up? Highly interested.
  - StreamBright 7y ago
    Sorry I have studied this in other language and I not even sure how these things called in English. There is one graph that I remember called Woehler curve and there is another one that shows how much is the life expectancy operating between different charging levels (which I cannot find the name for). https://www.researchgate.net/figure/Woehler-curve-for-lithium-ion-battery_fig2_275258416 https://www.researchgate.net/figure/Woehler-curve-for-lithiu... Update: It is called SN curve: https://www.researchgate.net/figure/SN-curve-applied-to-battery-lifetime-estimation-Number-of-cycles-in-function-of-depth-of_fig7_249322820 https://www.researchgate.net/figure/SN-curve-applied-to-batt... It shows a bit different picture for Li-ION that I remembered.
    - hakejpc 7y ago
      The reading I did years ago stressed that you should definitely cycle batteries to as close as Zero as possible, but if you want to do long-term storage keep them at 40%. Seems like there is a lot of myth around how batteries work and proper practice. A unified resource on this would be great!
      - aeternum 7y ago
        Depends on the battery chemistry. NiCd and NiMh batteries which were very popular 10+ years ago do have a memory effect: https://en.wikipedia.org/wiki/Memory_effect https://en.wikipedia.org/wiki/Memory_effect LiPo batteries do not have a memory effect, and you should avoid deep discharges.
      - StreamBright 7y ago
        I think the linked study gives you some insight. The problem is that we need all the capacity we get using a mobile phone for example. You can't really have a 2x capacity battery just for the ideal life time unfortunately.