mdocod
Flashaholic
WELCOME TO THE GREAT LITHIUM ION QUALITY POLL:
The purpose of this poll is to try to determine the premature-failure rate of various brands of Li-Ion cells.
If this is way out of line mods, feel free to close or delete this. I think similar polls have been done in the past on other topics like SF clickies and various other things in an attempt to resolve disagreements within the CPF community.
There is no way to use the "polling" option to accurately gather information on such a wide assortment of brands, and such a wide assortment of possible quantities. So in order to participate, you will have to type out your response to the poll and I will tally up results in this post. Please try to refrain from engaging in any substantial discussion in this thread. Lets try to keep it "to the point" and just have a list of results.
Post the following:
Brand, quantity, judgement
Don't worry about size, post results for any Li-Ion cell from CR2/AAA all the way up to 18650 and larger if you like. Please keep this poll limited to lithium cobalt oxide cells. If you killed a cell through user error please do not report the cell as "bad." If it lived a long healthy life before the user error you may report it as "good" or "excellent." Judge the cell "as a whole," that means, if the protection circuit of a protected cell fails, treat it as a failed cell when judging. If you do not know or remember the exact number of cells, you may report estimated results provided you feel they are as close to accurate as possible and won't cause major skewing of the results.
Judgement should be one of these things:
1. Excellent: The cell arrived in like-new condition, held 4.20V off the charger when new, is close to label capacity[within ~15%], and has seen many cycles of use without problems, Or lived long healthy life before failing or developing other problems.
2. Good: The cell has been working for many cycles without failure (or worked great for a long time before failing), but may not live up to capacity claims [is off by more than say, 15%] or had other small issues, like settling to 4.1V off the charger rather than holding a full charge when new.
3. Bad: The cell either failed prematurely (lets say, within the first 30 cycles or so, give or take for cycle depth, you be the judge) Or had major other problems, like severely high internal resistance, major self discharge, incapable of holding a charge above 4.10V when new. Or came in substantially below label capacity (like say, 30% under give or take, use your own judgement)
4. DOA: Cell arrived in a state of uselessness, OR, died within the first 5 cycles or less.
---------------------------------------------------------------------------------------
AW:
Excellent: 28
Good: 2
Bad:
DOA:
BatteryStation:
Excellent: 1
Good:
Bad:
DOA:
DLG:
Excellent:
Good: 2
Bad:
DOA:
e-lectronics
Excellent: 16
Good:
Bad:
DOA:
Generic "Blue/Green" no-name:
Excellent: 68
Good: 60
Bad: 2
DOA:
HiTech:
Excellent: 2
Good: 2
Bad :
DOA:
LG:
Excellent: 135
Good:
Bad: 1 (1 possibly user error)
DOA:
Molicel:
Excellent:
Good:
Bad:
DOA:
Panisonic:
Excellent: 80
Good: 128
Bad:
DOA:
Pila:
Excellent:
Good:
Bad:
DOA:
SAFT:
Excellent: 3
Good:
Bad:
DOA:
Samsung (received as used):
Excellent: 20
Good: 40
Bad:
DOA: >50
Sanyo:
Excellent: 175
Good:
Bad:
DOA:
SmartFire:
Excellent:
Good:
Bad:
DOA:
Sony:
Excellent: 345
Good: 48
Bad:
DOA: 3 (3 received as used)
SuperFire:
Excellent:
Good:
Bad:
DOA:
Tenergy:
Excellent:
Good:
Bad:
DOA:
TrustFire:
Excellent:
Good: 15
Bad: 2
DOA: 1
UltraFire:
Excellent:
Good: 35
Bad: 18
DOA: 2
Wolf-Eyes:
Excellent:
Good:
Bad:
DOA:
If your brand is not listed, I will add it.
The purpose of this poll is to try to determine the premature-failure rate of various brands of Li-Ion cells.
If this is way out of line mods, feel free to close or delete this. I think similar polls have been done in the past on other topics like SF clickies and various other things in an attempt to resolve disagreements within the CPF community.
There is no way to use the "polling" option to accurately gather information on such a wide assortment of brands, and such a wide assortment of possible quantities. So in order to participate, you will have to type out your response to the poll and I will tally up results in this post. Please try to refrain from engaging in any substantial discussion in this thread. Lets try to keep it "to the point" and just have a list of results.
Post the following:
Brand, quantity, judgement
Don't worry about size, post results for any Li-Ion cell from CR2/AAA all the way up to 18650 and larger if you like. Please keep this poll limited to lithium cobalt oxide cells. If you killed a cell through user error please do not report the cell as "bad." If it lived a long healthy life before the user error you may report it as "good" or "excellent." Judge the cell "as a whole," that means, if the protection circuit of a protected cell fails, treat it as a failed cell when judging. If you do not know or remember the exact number of cells, you may report estimated results provided you feel they are as close to accurate as possible and won't cause major skewing of the results.
Judgement should be one of these things:
1. Excellent: The cell arrived in like-new condition, held 4.20V off the charger when new, is close to label capacity[within ~15%], and has seen many cycles of use without problems, Or lived long healthy life before failing or developing other problems.
2. Good: The cell has been working for many cycles without failure (or worked great for a long time before failing), but may not live up to capacity claims [is off by more than say, 15%] or had other small issues, like settling to 4.1V off the charger rather than holding a full charge when new.
3. Bad: The cell either failed prematurely (lets say, within the first 30 cycles or so, give or take for cycle depth, you be the judge) Or had major other problems, like severely high internal resistance, major self discharge, incapable of holding a charge above 4.10V when new. Or came in substantially below label capacity (like say, 30% under give or take, use your own judgement)
4. DOA: Cell arrived in a state of uselessness, OR, died within the first 5 cycles or less.
---------------------------------------------------------------------------------------
AW:
Excellent: 28
Good: 2
Bad:
DOA:
BatteryStation:
Excellent: 1
Good:
Bad:
DOA:
DLG:
Excellent:
Good: 2
Bad:
DOA:
e-lectronics
Excellent: 16
Good:
Bad:
DOA:
Generic "Blue/Green" no-name:
Excellent: 68
Good: 60
Bad: 2
DOA:
HiTech:
Excellent: 2
Good: 2
Bad :
DOA:
LG:
Excellent: 135
Good:
Bad: 1 (1 possibly user error)
DOA:
Molicel:
Excellent:
Good:
Bad:
DOA:
Panisonic:
Excellent: 80
Good: 128
Bad:
DOA:
Pila:
Excellent:
Good:
Bad:
DOA:
SAFT:
Excellent: 3
Good:
Bad:
DOA:
Samsung (received as used):
Excellent: 20
Good: 40
Bad:
DOA: >50
Sanyo:
Excellent: 175
Good:
Bad:
DOA:
SmartFire:
Excellent:
Good:
Bad:
DOA:
Sony:
Excellent: 345
Good: 48
Bad:
DOA: 3 (3 received as used)
SuperFire:
Excellent:
Good:
Bad:
DOA:
Tenergy:
Excellent:
Good:
Bad:
DOA:
TrustFire:
Excellent:
Good: 15
Bad: 2
DOA: 1
UltraFire:
Excellent:
Good: 35
Bad: 18
DOA: 2
Wolf-Eyes:
Excellent:
Good:
Bad:
DOA:
If your brand is not listed, I will add it.
Last edited:
) but these have exceeded those expectations significantly. I'm not the right person to comment on capacity, as I charge all my cells long before they run out of juice.
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