SYSMAX Ind./Clike to find more about Nitecore flashlights!
Page 30 of 40 FirstFirst ... 20232425262728293031323334353637 ... LastLast
Results 871 to 900 of 1188

Thread: Maha MH-C9000 SUPPORT / FAQ - continuation

  1. #871
    Enlightened
    Join Date
    Dec 2011
    Location
    Germany
    Posts
    31

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    I never paid attention to the charging results while doing a break-in. Now I did the first time and it confused me. I did a 2000 break-in and the charging results after 16 hours differed by 10 mAh. This is a difference of about 3 min @200mA. Where does this difference come from?

    Will each slot be charged slightly differently (since they are independent)?
    Does this effect also discharging? Or does this not matter in normal mode since the C-9000 is counting the pulses and then it doesnt matter in which slot the cell was inserted?

  2. #872
    Silver Moderator
    SilverFox's Avatar
    Join Date
    Jan 2003
    Location
    Bellingham WA
    Posts
    11,646

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Hello DT 123,

    Each channel is independent, so you can expect variations. They are usually close, but not exact.

    Tom
    Behind every Great man there's always a woman rolling her eyes...

    Most batteries don't die - they are tortured to near death, then murdered...

  3. #873
    Flashaholic* samgab's Avatar
    Join Date
    Aug 2010
    Location
    Auckland, New Zealand
    Posts
    1,096

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    I did some more testing with the Fluke:
    setting slot displayed rate min max avg % of Displayed rate
    200 1 197 2 1910 174 88%
    200 2 198 2 1869 170 86%
    200 3 197 2 1868 169 86%
    200 4 197 2 1839 166 84%
    200 Average
    197 2 1872 170 86%
    500 1 494 2 1923 438 89%
    500 2 495 2 1886 426 86%
    500 3 494 2 1886 428 87%
    500 4 494 2 1855 425 86%
    500 Average
    494 2 1888 429 87%
    1000 1 990 2 1923 875 88%
    1000 2 989 2 1883 862 87%
    1000 3 988 2 1887 863 87%
    1000 4 988 2 1855 850 86%
    1000 Average
    989 2 1887 863 87%
    2000 1 1980 22 1923 1755 89%
    2000 2 1981 21 1884 1718 87%
    2000 3 1983 21 1891 1727 87%
    2000 4 1976 21 1855 1695 86%
    2000 Average
    1980 21 1888 1724 87%
    Grand Average

    7 1884 796 87%







    setting slot displayed rate min max avg % of Displayed rate
    -100 1 -99 3 -996 -88 89%
    -100 2 -98 3 -977 -86 88%
    -100 3 -100 3 -998 -87 87%
    -100 4 -99 3 -986 -86 87%
    -100 Average
    -99 3 -989 -87 88%
    -200 1 -199 3 -1004 -180 90%
    -200 2 -197 3 -986 -174 88%
    -200 3 -200 3 -1007 -182 91%
    -200 4 -198 3 -994 -180 91%
    -200 Average
    -199 3 -998 -179 90%
    -500 1 -499 3 -1004 -452 91%
    -500 2 -494 3 -985 -447 90%
    -500 3 -500 3 -1007 -457 91%
    -500 4 -496 3 -994 -450 91%
    -500 Average
    -497 3 -998 -452 91%
    -1000 1 -999 -7 -1003 -916 92%
    -1000 2 -990 -7 -985 -898 91%
    -1000 3 -1001 -8 -1006 -918 92%
    -1000 4 -992 -7 -993 -904 91%
    -1000 Average
    -996 -7 -997 -909 91%
    Grand Average

    0 -995 -407 90%



    The readings are all in mAh. The negative readings are for discharge, and positive ones are for charge.






    Last edited by samgab; 12-28-2011 at 05:33 AM.
    In date order, as far as I can remember: Mag 4D LED, LL P14, Fenix LD20 R4, 47s Preon 2 R5 red, 47s Quark Mini AA S2, Fenix TK35 XM-L T6, 4Sevens ReVO SS S2, Maha MH-C808M, Maha MH-C9000, 47s Single Bay Li-ion charger, Zebralight SC600 XM-L U2, Fenix TK70, iCharger 206B, Sunwayman D40A...

  4. #874
    Flashaholic* samgab's Avatar
    Join Date
    Aug 2010
    Location
    Auckland, New Zealand
    Posts
    1,096

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Charts for the discharge results:




    In date order, as far as I can remember: Mag 4D LED, LL P14, Fenix LD20 R4, 47s Preon 2 R5 red, 47s Quark Mini AA S2, Fenix TK35 XM-L T6, 4Sevens ReVO SS S2, Maha MH-C808M, Maha MH-C9000, 47s Single Bay Li-ion charger, Zebralight SC600 XM-L U2, Fenix TK70, iCharger 206B, Sunwayman D40A...

  5. #875
    Enlightened
    Join Date
    Dec 2011
    Location
    Germany
    Posts
    31

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Why did you compare to the displayed rates? You are assuming that that rate is used for the calculation of the total amount?
    The C-9000 is showing the rate only every 60 sec - do we know whether the present current is shown or the average current of the last minute?
    Since the test running time was longer than one minute - did you average also the display rates?

    But it was a very interesting test. First of all since for charging slot #4 had the lowest current, but for discharging it was slot #2.
    Any idea what could be the reason for that?

  6. #876
    Flashaholic* samgab's Avatar
    Join Date
    Aug 2010
    Location
    Auckland, New Zealand
    Posts
    1,096

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Quote Originally Posted by DT 123 View Post
    Why did you compare to the displayed rates? You are assuming that that rate is used for the calculation of the total amount?
    The C-9000 is showing the rate only every 60 sec - do we know whether the present current is shown or the average current of the last minute?
    Since the test running time was longer than one minute - did you average also the display rates?

    But it was a very interesting test. First of all since for charging slot #4 had the lowest current, but for discharging it was slot #2.
    Any idea what could be the reason for that?
    I compared the unit's displayed rate, because that is the charge rate that it is saying it is charging or discharging at. I wanted to compare that to the rate it was actually charging at.
    I tested one bay at a time, so I was getting the unit's rate much more frequently than every 60 seconds. And I checked it multiple times before taking down a reading to confirm that it is a stable, non-changing reading. The rate displayed doesn't really change it stays pretty much constant.

    The differences are most likely because the C9000 is not a precision item of lab equipment.
    It is just a consumer battery charger/analyser. They use multiple components inside that probably have quite (relatively) large margins for error, and tolerances.
    The Fluke 87V, on the other hand is a precision piece of equipment.

    I don't know the exact reason why one particular bay would be higher than the others whilst lower than the others for discharging (that would require disassembling the unit and testing each component separately), but I'd say generally it's because each slot is independent from the others, and some different components are used for charging than for discharging. So it would make sense that how one compares to the others in charging wouldn't necessarily correlate to how it compares to the others when discharging.
    In date order, as far as I can remember: Mag 4D LED, LL P14, Fenix LD20 R4, 47s Preon 2 R5 red, 47s Quark Mini AA S2, Fenix TK35 XM-L T6, 4Sevens ReVO SS S2, Maha MH-C808M, Maha MH-C9000, 47s Single Bay Li-ion charger, Zebralight SC600 XM-L U2, Fenix TK70, iCharger 206B, Sunwayman D40A...

  7. #877
    Enlightened
    Join Date
    Dec 2011
    Location
    Germany
    Posts
    31

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    I still think that something is wrong with the test/data. If you found out that the displayed rates are differing in average by 10% by your measured rates then this would finally mean that the C-9000 is giving us for charging & discharging results which are 10% too low. This means that when the c-9000 is measuring a capacity of 2000 then in reality it should be 2200 mAh. But this cannot be true. This also doesnt match to the 2% capacity accuracy while doing the break-in.

  8. #878
    Flashaholic* Wrend's Avatar
    Join Date
    Oct 2010
    Location
    United States, IL
    Posts
    653

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    The capacity measurement is calculated differently, from what I remember. If you read the current rate on the C9000 and time out how long its on there, it won't match up with the capacity because of this difference.

    The capacity measurement, especially on the break in function, is accurate.
    Last edited by Wrend; 12-29-2011 at 12:23 AM.

  9. #879
    Enlightened
    Join Date
    Dec 2011
    Location
    Germany
    Posts
    31

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Because of the 10% (?) 'service break'. As far as i remember we should multiply by 0.9. But even then i get different results:
    #1:
    shown current: 194mA * 16 hour * 0.9 = 2794 mAh. The c-9000 shows me 2824.
    #2:
    shown current: 244mA * 16 hour * 0.9 = 3514 mAh. The c-9000 shows me 3592.

    Rounding because of display: 0.5 mA * 16 hour * 0.9 = 7.2

  10. #880
    Flashaholic* samgab's Avatar
    Join Date
    Aug 2010
    Location
    Auckland, New Zealand
    Posts
    1,096

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Quote Originally Posted by DT 123 View Post
    I still think that something is wrong with the test/data. If you found out that the displayed rates are differing in average by 10% by your measured rates then this would finally mean that the C-9000 is giving us for charging & discharging results which are 10% too low. This means that when the c-9000 is measuring a capacity of 2000 then in reality it should be 2200 mAh. But this cannot be true. This also doesnt match to the 2% capacity accuracy while doing the break-in.
    As Wrend said, the displayed discharge amount (mAh) is calculated differently than the discharge rate (mA) and is accurate (within 1-2%).
    The capacity calculation is based on the actual current rather than the set (or displayed) current so capacity calculation remains accurate.
    According to Will Chueh of Maha, "The MH-C9000 has a 1% tolerance in the discharge current measurement."
    Also from Will: "
    The displayed charging/discharging rate does not include a ~10% off-time. For example, when you set current to 2.0A, it will charge at 2.0A for 90% of the time and rest for 10%. Of course, the capacity reported includes this effect." The ~ means "about", so it isn't necessarily precisely 10%, as shown by my testing.
    A way to test the capacity accuracy in comparison to the displayed rate yourself is to use a stopwatch. Discharge a fully charged AA at a set 1000mA for exactly 1 hour and check the readout for capacity vs it's rate.
    I did this with 4 eneloops and the result for slots 1-4 was 915, 907, 920, 911 mAh displayed, respectively. On par with my test results.
    The C9000 discharge rate (mA) display though, read 999, 990, 1002, and 992 respectively.
    Each unit might differ by a little bit, because it's not a calibrated instrument, but a few mAh here or there aren't a major concern.
    In date order, as far as I can remember: Mag 4D LED, LL P14, Fenix LD20 R4, 47s Preon 2 R5 red, 47s Quark Mini AA S2, Fenix TK35 XM-L T6, 4Sevens ReVO SS S2, Maha MH-C808M, Maha MH-C9000, 47s Single Bay Li-ion charger, Zebralight SC600 XM-L U2, Fenix TK70, iCharger 206B, Sunwayman D40A...

  11. #881
    Enlightened
    Join Date
    Dec 2011
    Location
    Germany
    Posts
    31

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    I did some cycle tests after a break in with some of my older cells:

    Code:
    Varta 1600, Cycle @ 800/500 mA
    
    		#1	#2
    
    Break-In	1284	1336
    Cycle 1		1257	1292
    Cycle 2		1212	1250
    Cycle 3		1209	1249
    
    Ansmann 2500, Cycle @ 1000/500 mA
    
    		#1	#2
    
    Break-In	2001	2020
    Cycle 1		1928	1953
    Cycle 2		1870	1886
    Cycle 3		1843	1867
    
    
    GP 1800, Cycle @ 1500/400 mA
    
    		#1
    
    Break-In	1245
    Cycle 1		1200
    Cycle 2		1197
    Cycle 3		1182

    Shouldn't the cycle improve the capacity of a cell?
    Is it an accident that the capacity dropped each time (from cycle to cycle) and the cycle results are still within the range to be seen as the same?
    For the GP i would think so. But what could be the reason for the drop from cycle 1 to cycle 2 for the Varta & Ansmann cells?

  12. #882
    Silver Moderator
    SilverFox's Avatar
    Join Date
    Jan 2003
    Location
    Bellingham WA
    Posts
    11,646

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Hello DT 123,

    Interesting trend...

    At the rate things are going, your cells may be used up in another 10 - 20 cycles. Perhaps you should run another test of 10 cycles and see if things turn around or continue to decline.

    Tom
    Behind every Great man there's always a woman rolling her eyes...

    Most batteries don't die - they are tortured to near death, then murdered...

  13. #883
    Enlightened
    Join Date
    Dec 2011
    Location
    Germany
    Posts
    31

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    I started another cycle test. Results continue to drop or reach a stable value. I started also another cycle test with some older Sanyo Twicell 1600 & some newer LSD Panasonic Infinium 2000. The tests are still going on, but what I get was not was I was really waiting for:

    Code:
    Varta 1600, Cycle @ 800/500 mA	|	Ansmann 2500, Cycle @ 1000/500 mA
    				|
    		#1	#2	|	#1	#2		
    				|
    Break-In	1284	1336	|	2001	2020
    Cycle 1/3	1257	1292	|	1928	1953
    Cycle 2/3	1212	1250	|	1870	1886
    Cycle 3/3	1209	1249	|	1843	1867
    Cycle 1/10	1238	1273	|	1808	1843
    Cycle 2/10	1191	1227	|	1807	1832
    Cycle 3/10	1192	1231	|	1789	1820
    Cycle 4/10	1190	1224	|	1766	1807
    Cycle 5/10	1193	1213	|	...	...
    Cycle 6/10	1189	1218	|	...	...
    
    Sanyo Twicell 1600, Cycle @ 800/500 mA
    
    		#1	#2	#3	#4
    
    Break-In	1402	1267	1177	1230
    Cycle 1/3	1286	1209	1030	1153
    Cycle 2/3	1258	1196	996	1121
    Cycle 3/3	1249	1200	969	1132
    
    
    Panasonic Infinium 2000, Cycle @ 1000/500 mA
    
    		#1	#2	#3	#4
    
    Break-In	1893	1933	1947	1913
    Cycle 1/3	1872	1910	1930	1893
    Cycle 2/3	1835	1888	1899	1861
    Cycle 3/3	1838	1885	1894	1864
    You mean that certainly most of the cells are already dead.
    I have to add that all cells had not more than 20-50 charging cycles before these tests.
    But I am pretty sure that some of them were killed by letting them in an Ansmann energy 8 charger(@trickle) for too long. So certainly they dried out? But then again - shouldn't I get then from the beginning the low results?

    The only real increase I reached at cycle 1/10 for the Varta cells. But these cells were the only ones who rested long enough between 2 cycles and got finally 2 times the top off charge - once after the last charging at cycle 3/3 and then again for the first charge at cycle 1/10.
    None of the cells did become too hot while charging.

    So - why there is the drop between cycle 1 and cycle 2 for all of the cells?
    Last edited by DT 123; 01-01-2012 at 09:45 AM.

  14. #884
    Silver Moderator
    SilverFox's Avatar
    Join Date
    Jan 2003
    Location
    Bellingham WA
    Posts
    11,646

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Hello DT 123,

    Good question... I don't know the answer.

    However, I can speculate that it may involve variables with electrolyte changes, internal cell resistance, and temperature. I can say that fresh new cells behave differently than aged cells. One of the issues with using loose cells as a battery is matching them. Aged cells need to be viewed over several cycles until their performance characteristics are stable. Fresh cells are much more stable once you get past the initial break in.

    Tom
    Behind every Great man there's always a woman rolling her eyes...

    Most batteries don't die - they are tortured to near death, then murdered...

  15. #885
    Flashaholic* tobrien's Avatar
    Join Date
    Dec 2005
    Location
    Georgia Highway 441
    Posts
    4,317

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    just bought a C9000 for $44 off of Amazon through their "warehouse deals" thing. description said "very minor packaging flaws/damage" but that the item is in excellent condition.

    i can't wait to join this C9000 club

    free two-day shipping too, since I'm an Amazon Prime member
    aka Edgar Allan Bro, Brosama Bin Liftin, Walter Crunkite, Bro Namath, Teddy Brosevelt, and the Tomahawk Crunkmissile.
    my lights - review of PrecisionWorks - that's Gucci Mane in my avatar

  16. #886
    Enlightened
    Join Date
    Dec 2011
    Location
    Germany
    Posts
    31

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    @Tom:
    After doing some cycles I was curious what results a new break-in would show:

    Code:
    Ansmann 2500, Cycle @ 1000/500 mA
    
    		#1	#2
    
    Break-In	2001	2020
    Cycle 1/3	1928	1953
    Cycle 2/3	1870	1886
    Cycle 3/3	1843	1867
    Cycle 1/9	1808	1843			
    Cycle 2/9	1807	1832
    Cycle 3/9	1789	1820
    Cycle 4/9	1766	1807
    Cycle 5/9	1756	1802
    Cycle 6/9	1749	1787
    Cycle 7/9	1739	1782
    Cycle 8/9	1723	1772	
    Cycle 9/9	1708	1758	
    Break-In	1802	1856
    Instead of improving the cells I lost 10%. The capacity dropped with every cycle.
    Measuring the ICV I get values between 1.7 & 1.8 - finally not that bad. I always thought that older crap cells will have values of 2 or higher. Isn't that so?

    How do old end-of-life cells behave if you treated them well? Will the internal resistance also increase or will only the capacity drop?
    If I want to judge the cells then I have at the moment 3 criteria:
    - capacity
    - self-discharging
    - ICV (internal resistance) which seems to be connected to the voltage under load (the higher the ICV the lower U while discharging). Is this true?

  17. #887
    *Flashaholic* Mr Happy's Avatar
    Join Date
    Nov 2007
    Location
    Southern California
    Posts
    5,390

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Quote Originally Posted by DT 123 View Post
    Instead of improving the cells I lost 10%. The capacity dropped with every cycle.
    Measuring the ICV I get values between 1.7 & 1.8 - finally not that bad. I always thought that older crap cells will have values of 2 or higher. Isn't that so?

    How do old end-of-life cells behave if you treated them well? Will the internal resistance also increase or will only the capacity drop?
    If I want to judge the cells then I have at the moment 3 criteria:
    - capacity
    - self-discharging
    - ICV (internal resistance) which seems to be connected to the voltage under load (the higher the ICV the lower U while discharging). Is this true?
    It is not to be expected that repeated cycling of cells will improve them, only recover them from poor condition. Once cells have been recovered, they then enter the normal wear and tear cycle in which each cycle uses up a bit more of the battery and brings it closer to the end of its life.

    There is no way to say what the ICV of any particular cell will be. It depends entirely on the specific cell.

    Usually the internal resistance of cells will increase as they age and the capacity will drop. Both things are signs of cells wearing out.

    Yes, the internal resistance of a cell is directly connected to the voltage under load. The higher the internal resistance the lower the voltage.

    Since the capacity of your cells is going down so measurably with each cycle it seems they are really almost used up. They are at 68% of their label capacity which is rather low.
    Tiefer, tiefer, irgendwo in der Tiefe gibt es ein Licht

  18. #888
    Silver Moderator
    SilverFox's Avatar
    Join Date
    Jan 2003
    Location
    Bellingham WA
    Posts
    11,646

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Hello DT 123,

    Crap cells are a very interesting study. Some behave just like you are seeing. I think Mr Happy hit it on the head. The internal resistance is only part of the equation. When the electrolyte is compromised, or the electrodes dried out, the capacity just seems to fall off.

    I recycle cells when their capacity drops below 80% of their initial capacity. Others keep using cells as long as they hold any charge at all.

    I have some NiMh cells from 2005 that are still at 85% of their initial capacity. I keep thinking it is time to retire them, but they keep on working. I take very good care of them and that care seems to result in long life and good performance.

    Tom
    Behind every Great man there's always a woman rolling her eyes...

    Most batteries don't die - they are tortured to near death, then murdered...

  19. #889
    Flashaholic* N162E's Avatar
    Join Date
    Jul 2002
    Location
    Warren, MI
    Posts
    686

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Quote Originally Posted by SilverFox View Post
    Hello DT 123,I recycle cells when their capacity drops below 80% of their initial capacity. Others keep using cells as long as they hold any charge at all.
    Tom
    +1
    Fred R. Elias Jr. N162E
    1-586-755-1245 24/7
    fre@felias.com

  20. #890

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    I wanted to consult the sages and determine what action to take on cells that show discharge capacities that are 60-70 percent of the manufacturers label? Should I continue to refresh (with a discharge in between) or move straight into a Break-in mode? These are cells that have been in service for a few years with usually nothing more than dropping them in the charger and walking away. These particular cells are 750 mAh and 900 mAh AAA cells. After a couple of refreshes I am seeing about a 4 percent (of labeled capacity) increase for each cycle.

  21. #891

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Sorry for reposting, but I could not see where to subscribe to this thread without reposting.

  22. #892

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Sorry for reposting but I needed to subscribe to the thread. Then there was some sort of problem. Don't know how many of these posted.

    Hmmm. Can't delete these.

  23. #893
    Silver Moderator
    SilverFox's Avatar
    Join Date
    Jan 2003
    Location
    Bellingham WA
    Posts
    11,646

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Hello Finfin,

    Welcome to CPF.

    If you see improvement on multiple Break-In runs, you can keep running the Break-In function. It has the best chance to recover lost performance.

    Tom
    Behind every Great man there's always a woman rolling her eyes...

    Most batteries don't die - they are tortured to near death, then murdered...

  24. #894
    Flashaholic* N162E's Avatar
    Join Date
    Jul 2002
    Location
    Warren, MI
    Posts
    686

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Quote Originally Posted by finfin View Post
    I wanted to consult the sages and determine what action to take on cells that show discharge capacities that are 60-70 percent of the manufacturers label?
    Time for new ones. They have served you well and paid for themselves many times over. If you keep them they may get mixed in with newer cells and degrade run times of your lights or other battery operated goodies.
    Fred R. Elias Jr. N162E
    1-586-755-1245 24/7
    fre@felias.com

  25. #895
    Flashaholic* N162E's Avatar
    Join Date
    Jul 2002
    Location
    Warren, MI
    Posts
    686

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Delete
    Last edited by N162E; 01-24-2012 at 12:23 PM. Reason: Multiple Post
    Fred R. Elias Jr. N162E
    1-586-755-1245 24/7
    fre@felias.com

  26. #896
    Flashaholic* N162E's Avatar
    Join Date
    Jul 2002
    Location
    Warren, MI
    Posts
    686

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Delete
    Last edited by N162E; 01-24-2012 at 12:24 PM. Reason: Multiple Post
    Fred R. Elias Jr. N162E
    1-586-755-1245 24/7
    fre@felias.com

  27. #897

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Hi, is it possible to discharge Alkalines (cheap 1.5V AA, from the supermarket) on the C9000, and does this make sense at all?

    Which discharge rate should i choose?

    We certainly dont want to harm or damage the C9000 by doing so. Thanks for some thoughts!

  28. #898

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Why not just put them in a flashlight to discharge them?
    Why discharge them at all?

  29. #899
    Flashaholic* uk_caver's Avatar
    Join Date
    Feb 2007
    Location
    Central UK
    Posts
    1,300

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Quote Originally Posted by finfin View Post
    Why discharge them at all?
    It can be interesting to find out the capacity (and cross-cell capacity consistency) of cheap cells.

  30. #900
    *Flashaholic* Mr Happy's Avatar
    Join Date
    Nov 2007
    Location
    Southern California
    Posts
    5,390

    Default Re: Maha MH-C9000 SUPPORT / FAQ - continuation

    Quote Originally Posted by shelm View Post
    Hi, is it possible to discharge Alkalines (cheap 1.5V AA, from the supermarket) on the C9000, and does this make sense at all?

    Which discharge rate should i choose?

    We certainly dont want to harm or damage the C9000 by doing so. Thanks for some thoughts!
    You can, but it would be best to choose a low discharge rate like 100 mA. Alkaline batteries don't respond well to high discharge rates and they will give you very poor capacity results.
    Tiefer, tiefer, irgendwo in der Tiefe gibt es ein Licht

Page 30 of 40 FirstFirst ... 20232425262728293031323334353637 ... LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •