fusso
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Li ion batteries same size but different capacities?
I have some LIs from 2 battery packs, they have the same cylindrical shape, diameter and length, but with wildly different capacities (0.8 &
2.6Ah). Is this possible? Are those claimed to have higher capacity actually have capacity similar to the lower ones?
(Claimed to be damaged/broken from someone else so don't ask me if they work or not)
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Sulaiman
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approximately :
If the electrodes are thin then the cell can store a lot of energy,
if the electrodes are thick then the cell can deliver higher current.
CAUTION : Hobby Chemist, not Professional or even Amateur
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vmelkon
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Quote: Originally posted by fusso  | I have some LIs from 2 battery packs, they have the same cylindrical shape, diameter and length, but with wildly different capacities (0.8 &
2.6Ah). Is this possible? Are those claimed to have higher capacity actually have capacity similar to the lower ones?
(Claimed to be damaged/broken from someone else so don't ask me if they work or not) |
Sure. Why not.
The external package (cylindrical) might be large but it might contain a small battery.
This isn't anything new. I once bought a Ni-Cd "D" cell battery in 1992 and when I cut it open, I saw that it actually contains a slightly larger than
an AA battery inside.
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fusso
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| Quote: Originally posted by vmelkon | Sure. Why not.
The external package (cylindrical) might be large but it might contain a small battery.
This isn't anything new. I once bought a Ni-Cd "D" cell battery in 1992 and when I cut it open, I saw that it actually contains a slightly larger than
an AA battery inside. |
No, I mean the cylindrical LIs are the 18650 type.
[Edited on 190731 by fusso]
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wg48temp9
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As an other poster already stated, as confirmed by batterybro.com
"The two most important specs for 18650 cells are capacity measured in mAh (milliamp hours) and maximum continuous discharge measured in A (amperes).
When selecting a battery type you must favor one over the other. High-capacity batteries have a low max. continuous discharge and high-amp batteries
have a low capacity. Typical highest-capacity batteries in 2015 are ~3500mAh, and highest-amp batteries are 30A."
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Twospoons
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The cathode chemistry makes a big difference - it can be optimised for capacity or current delivery.
https://batteryuniversity.com/learn/article/types_of_lithium...
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