Sciencemadness Discussion Board
Not logged in [Login - Register]
Go To Bottom

Printable Version  
Author: Subject: Li ion batteries same size but different capacities?
fusso
International Hazard
*****




Posts: 1533
Registered: 23-6-2017
Location: ∥(parallel) universe
Member Is Offline

Mood: Mood

[*] posted on 30-7-2019 at 08:40
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)




Useful sites:
Balance Chemical Equation: http://www.webqc.org/balance.php
Molecular mass and elemental composition calculator: https://www.webqc.org/mmcalc.php
Solubility table: https://en.wikipedia.org/wiki/Solubility_table
Azeotrope table: https://en.wikipedia.org/wiki/Azeotrope_tablesIt's not crime if noone finds out - Nyaruko
List of materials made by ScienceMadness users: https://docs.google.com/spreadsheets/d/1nmJ8uq-h4IkXPxD5svnT...
View user's profile View All Posts By User
Sulaiman
International Hazard
*****




Posts: 2545
Registered: 8-2-2015
Location: Shah Alam, Malaysia
Member Is Offline


[*] posted on 30-7-2019 at 09:35
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
(suffering from separation of me and my chemistry stuff)
View user's profile View All Posts By User
vmelkon
International Hazard
*****




Posts: 638
Registered: 25-11-2011
Location: Canada
Member Is Offline

Mood: autoerotic asphyxiation

[*] posted on 30-7-2019 at 16:14


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.




Signature ==== Is this my youtube page? https://plus.google.com/u/0/102731756100318541546/videos?tab...
We must attach the electrodes of knowledge to the nipples of ignorance and give a few good jolts.
Yes my evolutionary friends. We are all homos here.
View user's profile View All Posts By User
fusso
International Hazard
*****




Posts: 1533
Registered: 23-6-2017
Location: ∥(parallel) universe
Member Is Offline

Mood: Mood

[*] posted on 30-7-2019 at 22:40


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]




Useful sites:
Balance Chemical Equation: http://www.webqc.org/balance.php
Molecular mass and elemental composition calculator: https://www.webqc.org/mmcalc.php
Solubility table: https://en.wikipedia.org/wiki/Solubility_table
Azeotrope table: https://en.wikipedia.org/wiki/Azeotrope_tablesIt's not crime if noone finds out - Nyaruko
List of materials made by ScienceMadness users: https://docs.google.com/spreadsheets/d/1nmJ8uq-h4IkXPxD5svnT...
View user's profile View All Posts By User
wg48temp9
Hazard to Others
***




Posts: 151
Registered: 30-12-2018
Member Is Offline


[*] posted on 30-7-2019 at 22:57


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."




i am wg48 but not on my usual pc hence the temp handle.
View user's profile View All Posts By User
Twospoons
International Hazard
*****




Posts: 979
Registered: 26-7-2004
Location: Middle Earth
Member Is Offline

Mood: Full of B12 - YIPPEE!

[*] posted on 31-7-2019 at 22:15


The cathode chemistry makes a big difference - it can be optimised for capacity or current delivery.
https://batteryuniversity.com/learn/article/types_of_lithium...




Helicopter: "helico" -> spiral, "pter" -> with wings
View user's profile View All Posts By User

  Go To Top