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Thread: Test/review of Charger ISDT C4

  1. #1
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    Default Test/review of Charger ISDT C4

    Charger ISDT C4





    This charger from ISDT has a lot of functions and can handle both NiMH and all 3 common LiIon types. It can also do NiZn.




    The charger was in a cardboard box with specifications on the outside.



    The box contains the charger, a power supply, a instruction sheet, a screen protector and some stickers.
    I used the screen protector, but as can be seen on some of the photos I was not very lucky with putting it on.



    The stickers.



    The charger is powered from 12V and has a usb output and a micro usb "update connector" for new firmware releases.
    The fan is a bit loud and will turn on/off frequently when the charger is working hard, this is rather annoying.



    On the bottom is the specifications and air intake correctly placed at opposite end of air outlet.



    The power supply is a standard 12V 2.5A model.



    The user interface is a good looking color lcd display and a panel at the right. It is possible to touch up/down/select, there is auto repeat on up/down. The up/down function can also be done by sliding.
    The touch button works mostly fine, except it sometimes believe I am sliding when I am not.



    The charger will automatic recognize NiMH, 3.6V and 4.2V LiIon batteries, but for the two LiIon types this recognition do first take place around 3.6-3.7V, until then it will not specify what type LiIon it is charging. This also means that discharging or charging to storage voltage the automatic recognition will sometimes fail.
    The charger has a lot of modes, I have tested most modes below.

    Available chemistries: NiMH, NiCd, NiZn, Eneloop, Li-Ion, LiFePO4, LiHv (In my test I used NiMH, not Eneloop)



    The display looks very nice and includes a lot of information.



    There is no scale on the curve, but it gives a good idea of what is going on.





    Even the input voltage and the usb output current is monitored.
    Holding down on the select button will open the system menu where it is possible to see software/hardware version, reset to factory settings, select language (5), beeper volume (off-low-medium-high), backlight (low-medium-high), capacity limit (on-off), auto start after (off, 3s, 5s), cycle display (off-5s-10s)



    The charger has fixed slots, this limits what size batteries it can handle.
    AAA slot up to about 45mm
    AA slot up to about 51.5mm
    xx650 slot up to about 67mm



    The slot marked AA/AAA can also handle LiIon batteries.







    The charger cannot handle protected cell, but both button top and flat top will usual work. The charger is very limited in supported battery sizes, but with spacers it is possible to handle a few more sizes.



    Measurements

    • Power consumption is 1.5W when idle with display on and 0.9W with display off.
    • Charger do not assume chemistry on voltage alone.
    • Charger will sometimes automatic select between LiFePO4 and LiIon 4.2V
    • When not powered the charger will discharge LiIon with about 0.03mA
    • Voltmeter is within 0.03V
    • Voltmeter updates both during charge and when the charger is finished.
    • Charger will not restart if battery voltage drops
    • Charge will restart charging after power loss or battery insertion.





    The charger has 4 channels and each has two set of terminals. The black numbers are the channels, the white numbers are the references I use in the test.

    Test is done with firmware 1.0.0.8
    After the testing I updated to firmware 1.0.0.11, it was easy on a Win10 computer. The description of the improvements was not very useful, it just said "optimization" for analysis and NiMH charge.



    4.2V LiIon charging

    The charger current for LiIon can be selected from 0.1A to 3A in 0.1A steps.



    This charge is a good simulated CC/CV curve.
    Display shows: 3214mAh 67mOhm 6:50:30



    At higher charge current it goes faster and the voltage will go above 4.25V.
    Display shows: 3274mAh 54mOhm 2:26:10



    How much it goes above depends on the internal resistance of the cell.
    Display shows: 3212mAh 46mOhm 2:25:03



    This cell is not exactly new and the voltage goes above 4.30V, using a lower charge current would have improved this.
    Display shows: 2630mAh 75mOhm 1:33:45



    Two cells at maximum charge current, again the voltage is up tp 4.30V.
    Display shows: 2842mAh 48mOhm 1:05:22 and 2821mAh 45mOhm 1:08:15



    Using an external 12V supply it looks like the 2.5A input rating is exactly right, but 4.40V during charge is way to much.



    M1: 29,7C, M2: 30,6C, HS1: 37,0C
    The charger do not heat the batteries from internal heat, the fan handles this.



    HS1: 36,0C



    The charger needs about 5 seconds to start, a few of these seconds are used to wait for the user, other are used to initialize and play a welcome melody.
    The charger starts slowly and after a few seconds it will use the selected current.



    While charging it will turn current off to do a voltage check each 3. second.



    4.2V LiIon discharging

    The discharge current can be selected from 0.1A to 1.5A in 0.1A steps.



    The charger discharges to 3.1V and it looks like it is adjusting the current trying to keep the voltage at 3.1V.



    Two cells at full discharge current.
    Display shows 2685mAh 2:02:26 and 2677mAh 2:00:10



    M1: 27,2C, M2: 25,9C, M3: 38,9C, HS1: 44,2C
    The noisy fan is good at keeping the batteries and charger cool.



    HS1: 42,1C



    4.2V LiIon analyzing

    For analyzing LiIon the current can be selected from 0.1A to 3A in 0.1A steps. The time shown is for the total operation.



    The batteries are charged, discharged and charged again. The charge is not done correctly it is missing the CV part (See below about software update).
    Display shows 3260mAh 76mOhm 10:04:29



    If the selected current is higher than the possible discharge current it will charge at selected current and use maximum discharge current.
    Display shows 3021mAh 68mOhm 03:58:41



    4.2V LiIon storage

    For storage the current can be select from 0.1A to 2.5A in 0.1A steps.



    First try at storage failed, the charger guessed it was a LiFePO4 cell and started discharging it, this was very fast!



    This time I selected 4.2V LiIon and the storage worked much better, it charged the battery to 3.7V
    Display shows: 1267mAh 57mOhm 01:01:23



    Next storage test was with a full battery and it was discharged to 3.7V



    4.2V LiIon cycle

    This cycle the current can be select from 0.1A to 2.5A in 0.1A steps, there is only one current setting.
    The number of cycles can be selected from 1 to 66.



    In this test I did 3 cycles and the charger added a final charging. The CV part of the charge is missing.
    Display shows 3074mAh 56mOhm, 21:10:48



    LiIon internal resistance

    The charger shows internal resistance while charging.



    The first row is done with the same battery in all slots, there is some variation some of it due to varying contact resistance.
    For all the other measurements the battery and connection is not touched.
    The results looks good, the charger is fairly close to the correct resistance values most of the time.



    LiIon activation

    The selection said 2A, but the display said 0.1A at 0V (Current will increase at higher voltage).



    The charger applies 0.1A for 2 minute to try resurrect the battery. If the voltage increase the current will also be increased.



    A closer look at the current shows it is pulses.

    When activation fails the charger report "Battery type wrong"



    4.35V LiIon charging

    The charger has a special LiIon LiHv type that charges to 4.35V



    The simulated CC/CV charging strikes again with too high voltage during charging.
    Display show 2845mAh 154mOhm 03:07:29



    3.7V (LiFePO4) LiIon charging

    Usual the charger will automatic recognition this type of LiIon cell and stop the charger at 3.7V



    Display show 1131mAh 92mOhm 00:57:03



    Both cells are charged fine and looking at the start of the curve it can be seen that the charger uses a low current below 3V.
    Display show 512mAh 118mOhm 00:39:25



    NiMH charging

    The charger current can be selected from 0.1A to 2.0A in 0.1A steps.



    In the first curve I have selected way to low charge current for the cell and the charger failed to terminate when the cell was full, the termination was either on time or capacity (The 3001 in the display makes me suspect termination was on capacity).
    Display show 3001mAh 52mOhm 30:56:17



    A more sensible charge current and the charger uses a -dv/dt termination.
    Display shows 1972mAh 51mOhm 2:02:01





    It is the same on the 3 other channels (I used the same cell for these 4 test.
    #2 Display shows 2092mAh 44mOhm 2:09:25
    #3 Display shows 2067mAh 48mOhm 2:07:55
    #4 Display shows 2096mAh 55mOhm 2:09:43



    This high capacity cell is handled fine.
    Display shows 2658mAh 68mOhm 02:44:28



    The charger could not really terminate on this cell, but due to the 3000mAh limit, the charging is fine (Or as fine as can be expected with this old cell).
    Display shows 3001mAh 202mOhm 03:05:38



    Nice charging.
    Display shows 799mAh 95mOhm 01:38:55



    A full cell was discovered in 10 minutes.
    Display shows 171mAh 57mOhm 00:10:37



    Four NiMH at full charging current, this time the charger was a bit slow to terminate.
    Display shows 1997mAh 63mOhm 01:01:49, 1992mAh 44mOhm 01:01:40, 1997mAh 41mOhm 01:01:49, 1992mAh 40mOhm 01:01:40



    This time the charging looks perfect. The charger uses less than 2A from the power supply.



    M1: 28,4C, M2: 30,2C, M3: 30,7C, M4: 28,4C, HS1: 37,6C
    Not much heat in this picture.



    The charger need some time to initialize and wait for any user interaction, before starting charging.



    While charging it will turn current off to do a voltage check each 3. second.



    NiMH discharging

    NiMH discharge current can be selected from 0.1A to 1.5A in 0.1A steps.



    A NiMH discharge is to 0.9V and with a final low current discharge.
    Display show 1895mAh 2:01:52





    These discharge are done with the same cell as I charged above.
    #2 Display show 1882mAh 2:01:27
    #3 Display show 1919mAh 2:03:48
    #4 Display show 1927mAh 2:03:46



    M1: 27,0C, HS1: 38,9C
    The fan keeps the charger cool.



    NiMH analyzing

    NiMH analyzing current can be selected from 0.1A to 2A in 0.1A steps.



    The analyze cycle is a charge, a discharge and a final charge again.
    Display show 2175mAh 47mOhm 13:02:55 This is a super eneloop cell with more than 2000mA?



    NiMH internal resistance

    The charger shows internal resistance while charging.



    The first row is done with the same battery in all slots, there is some variation some of it due to varying contact resistance.
    For all the other measurements the battery and connection is not touched.
    The results looks good, the charger is fairly close to the correct resistance values most of the time.



    NiMH activation

    The selection said 2A, but the display said 0.1A at 0V (Current will increase at higher voltage).



    The charger applies 0.1A for 2 minute to try resurrect the battery. If the voltage increase the current will also be increased.



    A closer look at the current shows it is pulses.

    When activation fails the charger report "Battery type wrong"



    USB output


    • Power consumption is 1.5W when idle with display on and 0.9W with display off.
    • Usb output is auto coding with DCP, Samsung and Apple 1A





    The current display has good precision.



    The usb output can deliver just above 2.3A before overload protection trips.



    And it is exactly the same on 230VAC (As expected).



    No problem running for one hour with 2.1A output.
    The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.



    M1: 38,4C, M2: 36,3C, HS1: 43,1C



    M1: 37,4C, HS1: 57,1C
    I found a hot spot on the charger or at least a warm spot (The charger did not use the fan when I used the usb output).



    M1: 37,6C, HS1: 43,0C



    Noise is 172mV rms and 567mVpp



    Noise is 206mV rms and 850mVpp



    Noise is 148mV rms and 673mVpp



    With the fairly high noise level I decided to check what it contained.


    New firmware V1.0.0.11

    While I was testing a new firmware was release. I did first update when testing was finished and then I did a few extra checks on the areas where the new release was supposed to improve the charger (Analysis and NiMH charge).



    The low current NiMH charging was not improved, it still do not terminate.
    Display shows 3001mAh 40mOhm 30:56:17



    Normal NiMH charge looks similar.
    Display shows 2075mAh 61mOhm 02:08:22



    A CV voltage has been added to the initial charge in analysis mode and the discharge mode do not slowly reduce current anymore, instead it drops to 0.5A from there sloly reduce current. It looks like the charge failed, there is no CV phase.
    The fan did not stop when the charger was finished, but continued to run.
    Display shows 3138mAh 106mOhm 06:10:25

    Testing with 2500 volt and 5000 volt between mains and low volt side, did not show any safety problems with the power supply.



    Conclusion

    This charger has many functions and is easy to use, but it also has a few faults:
    Auto recognition of LiIon 4.2V and 3.6V(LiFePO4) do not always work. I have seen 4.2V LiIon stopping at 3.6V and discharge/storage is also likely to fail if started with a partial full 4.2V LiIon.
    First version of analysis missed the CV part, next version is better in that respect, but charger malfunctioned, this will probably be fixed in a later software update.
    LiIon charge algorithm use way to high charge voltage, but the battery will not be overcharged.
    There is also the limit on battery size, some common LiIon sizes requires spacers to be charged in this charger.

    Do this charger match the top analyzing charger? The answer is no, it is far behind in settings and precision, but it is much easier to use.

    For now I will only rate the charger acceptable.



    Notes

    The charger was supplied from Banggood for review.

    Here is an explanation on how I did the above charge curves: How do I test a charger
    Read more about how I test USB power supplies and chargers
    My website with battery, charger, usb reviews, comparisons & information: https://lygte-info.dk/
    Latest addition is multimeter reviews

  2. #2
    Flashaholic
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    Default Re: Test/review of Charger ISDT C4

    Thank You for another comprehensive review.

    It does have some interesting features. However, its flaws outweigh them in my mind. I will stick to My Opus which has served me well.

  3. #3

    Default Re: Test/review of Charger ISDT C4

    Very interesting -
    This charger really seems to use a real Li-Fast-Charge-Mode.
    As long as the additional charging voltage is not greater than the product of internal resistance and charging current, I have no objection.
    The voltage of the actual battery cell is then never above the end-of-charge voltage. This condition seems to be met in the graphs with one exception, the use of the external power supply.
    This charging process can then lead automatically to shorter charging times at higher charging currents and batteries with increased internal resistance.

  4. #4
    HKJ's Avatar
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    Default Re: Test/review of Charger ISDT C4

    Quote Originally Posted by sbj View Post
    The voltage of the actual battery cell is then never above the end-of-charge voltage. This condition seems to be met in the graphs with one exception, the use of the external power supply.
    The charger always has external power supply!
    My website with battery, charger, usb reviews, comparisons & information: https://lygte-info.dk/
    Latest addition is multimeter reviews

  5. #5

    Default Re: Test/review of Charger ISDT C4

    I meant the last charge curve of "4.2V LiIon charging" with the comment: "Using an external 12V supply it looks like the 2.5A input rating is exactly right, but 4.40V during charge is way to much.
    In this case the rule: Additional charging voltage should not be higher than Ri x charging current, was violated.

    I thought you were using a different (maybe stronger?) Power supply here for a try?

  6. #6
    HKJ's Avatar
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    Default Re: Test/review of Charger ISDT C4

    Quote Originally Posted by sbj View Post
    In this case the rule: Additional charging voltage should not be higher than Ri x charging current, was violated.
    Is that some rule you have decided or can you point to any manufacturer literature that has it?

    All I have seen says it is prohibited.

    Quote Originally Posted by sbj View Post
    I thought you were using a different (maybe stronger?) Power supply here for a try?
    I was using a lab power supply, but it was not really different from using the supplied 12V 2.5A supply.
    My website with battery, charger, usb reviews, comparisons & information: https://lygte-info.dk/
    Latest addition is multimeter reviews

  7. #7

    Default Re: Test/review of Charger ISDT C4

    Quote Originally Posted by HKJ View Post
    Is that some rule you have decided or can you point to any manufacturer literature that has it?
    All I have seen says it is prohibited.

    I was using a lab power supply, but it was not really different from using the supplied 12V 2.5A supply.
    It`s a feature of some good RC-hobby chargers. For example, the Junsi DUOs can use exactly that for faster charges: E.g. the 4010DUO in the manual on page 18 at: Balance Over Charge https://www.rcgroups.com/forums/show...eased%21%21%21

    Junsi: ..Balance Over Charge, the maximum overcharge compensation voltage acts as accelerated charge, and the larger the value, the more obvious the accelerated charge.
    For example: Charge Lipo with Vstd, set Balance Over charge to Vboc, the cells internal Resistance detected is Ri, when the charge current is Ia, the actual CV value of cells is Va
    IF Ri*Ia > Vboc THEN Va = Vstd + Vboc
    ELSE
    Va = Vstd+Ri*Ia
    Please set this parameter after understanding fully, or keep the default value at 0.

    This phrase is probably not easy to understand on first reading. However, it means nothing else than that the charger limits the value of the (temporary) higher charging voltage to the maximum value of the charging current times Ri, or to the here manually adjustable maximum value (here 50mV).

    Another advanced charger, the ELPROG Pulsar3: http://www.elprog.com.pl/english/?st...rma&pstrona=03

    goes in fast charge mode one step further, and charges during the usual CV phase with short (high) current pulses until the battery cells hold when finished, close the charge end voltage. -
    Although these pulses are short, they are significantly higher in the peak than on the Junsi.
    Last edited by sbj; 03-12-2018 at 10:53 AM.

  8. #8
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    Default Re: Test/review of Charger ISDT C4

    Quote Originally Posted by sbj View Post
    It`s a feature of some good RC-hobby chargers.
    So because some high end hobby chargers has a option you can enable to go outside the regular charger parameters, you mean it is fine a general purpose charger always goes outside the regular charge parameters and without telling anybody about it?
    My website with battery, charger, usb reviews, comparisons & information: https://lygte-info.dk/
    Latest addition is multimeter reviews

  9. #9

    Default Re: Test/review of Charger ISDT C4

    No - of course not!
    I do not know if it's really coincidence that the charger behaves exactly like that? But otherwise they would have advertised it as a "feature".

    It would be a nice accessory for an analysis charger (for freaks) and should then be switchable.
    Because of the very flexible programmable touch screen operation, something like this could be probably easily realized by software.

  10. #10
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    Default Re: Test/review of Charger ISDT C4

    Thanks for the review! I've been playing with this charger. A couple days ago I put a single eneloop in that had not been operating very well, that I expected might have been ready for the trash, but chose first too put it in this new charger and used Analyze mode. It seems it missed termination on the 3rd (or maybe it was the 2nd charge phase) as the final capacity displayed was slightly over 3000mAh. The charge rate was 500mA, and I didn't change any other settings. System info HW 1.0.0.3 BL 1.0.0.2 OS 1.0.0.9. Do you know what BL stands for? I will probably update to 1.0.0.11 before using the charger anymore.

  11. #11
    Flashaholic
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    Default Re: Test/review of Charger ISDT C4

    Very interesting, I wonder if the manufacturer would get this feedback on these test and fix the key issues as well build for longer cell. Way too short at 67mm 18650 accommodation. I wonder how the decided on such a short battery slot.

    Something to watch our for and the colour configurable mode display is a big plugs for my old eyes...

    Very detailed assessment.
    Thx

  12. #12
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    Default Re: Test/review of Charger ISDT C4

    Quote Originally Posted by tripplec View Post
    Very interesting, I wonder if the manufacturer would get this feedback on these test and fix the key issues as well build for longer cell. Way too short at 67mm 18650 accommodation. I wonder how the decided on such a short battery slot.

    Something to watch our for and the colour configurable mode display is a big plugs for my old eyes...

    Very detailed assessment.
    Thx
    It might be nice if they developed a little expansion device to hold a wider variety of cells. Maybe this is just their first model, until they get ti working a little better. It's fancy, but it's meant to be very simple, and I suspect simple application. Their other chargers are great, so I think they could arrive at a design that is suitable for a wider audience, or multiple models for different users. If they added a couple Banana jacks they could have a lot of options, with extensions.

  13. #13
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    Default Re: Test/review of Charger ISDT C4

    For me and many other size does not matter (need to be small) in a 4 cell charger. I use it on a desk/table. But if I can't fit my 18650 Protected LiIon cells in it. No customer here for sure. I would not want 2-4 adapter hanging out the top either. Also the double connection would affect the results after all the contact clips are not silver, platinum or gold plated and there will be some resistance on them tin tabs.

    1st effort and improvements needed.

    We're watching

  14. #14
    Flashaholic*
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    Default Re: Test/review of Charger ISDT C4

    Quote Originally Posted by tripplec View Post
    For me and many other size does not matter (need to be small) in a 4 cell charger. I use it on a desk/table. But if I can't fit my 18650 Protected LiIon cells in it. No customer here for sure. I would not want 2-4 adapter hanging out the top either. Also the double connection would affect the results after all the contact clips are not silver, platinum or gold plated and there will be some resistance on them tin tabs.

    1st effort and improvements needed.

    We're watching
    Good points. Yes it does seem a different design is needed to really utilize all the features with Li-Ion cells. Maybe they are happy only targeting a limited segment of the market, I hope not, we'll have to wait and see. Unfortunately Vaping is probably the largest consumer market for 18650 and other individual Li-Ion cells now.

  15. #15
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    Question Re: Test/review of Charger ISDT C4

    This charger basically has 4 charging channels. Unless I missed something, I presume each channel is independent of one another?

    So it should be possible to, for example, discharge a Li-Ion cell in channel one, analyse a Ni-MH cell in channel two, cycle another Ni-MH cell in channel three all at the same time?

    And the status display of each channel when cells are being processed, the display, by default, changes to the next channel after a preset delay (which can be changed I believe). Can the channel display be frozen or locked to one channel without the display moving on to the next channel? And can the channel being displayed be selected manually (overriding the automatic changing)?
    Last edited by meeshu; 07-09-2018 at 04:33 AM.

  16. #16
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    Default Re: Test/review of Charger ISDT C4

    Answering my own questions!!

    The iSDT C4 has independent slots/channels which means different cell chemistry can be used in each slot simultaneously. Also, each slot can run different processes (charging, discharging, cycling, analyzing etc) simultaneously.

    The parameter display of each slot/channel by default changes to the next used slot after a preset delay. This delay time can be changed, or it can be set so that the display is switched to the next used slot manually only.

    It would be good to see the cycle count being displayed also when cycling cells, so it can be seen how far along the cycling process has progressed. And maybe display an ETA of when the complete cycling process is expected to end.

    Also a display of the mAh capacity of cells of the previous cycle could be shown as a comparison to the present cycle cell capacity so it could be seen what improvement, if any, in cell capacity is being made using the cycling process.

  17. #17

    Default Re: Test/review of Charger ISDT C4

    Great review thankyou and very informative.
    I purchased a C4 because i wanted a simple charger to handle NiZn batteries AA and AAA.
    Did you do any testing with this chemistry?

    The charger will set it to NiMH if you have the default Auto setting (the manual says it will behave this way) so you do have to make sure you manuall set NiZn.
    My initial results are erratic. I tried 2 AAA UltraCells, and no matter what i did, i could get no more than a few mAh in or out of them before the cycle is terminated. Probably rubbish batteries.
    The AAs (turnigy) are better, but still not what i expected. The charge progress bar gets rapidly to 99% and there it sits for a long time, so it is not well calibrated. Discharging seems to end too early, but im not sure what a good termination voltage is for NiZn.
    Again, i dont have good reference NiZn batteries as a baseline.

    I'd welcome any suggestions or experiences.

  18. #18

    Default Re: Test/review of Charger ISDT C4

    For the size: AA-NiZn batteries I use the following values:
    Charge end voltage: 1,90V; Charging current: 300mA; Termination current: 50mA; Minimum discharge voltage: 1,1V; Capacity test: 300mA at discharge to 1.30V
    http://www.produktinfo.conrad.com/da...500MWH_4ER.pdf


    For the size: AAA-NiZn:
    Charge end voltage: 1,90V; Charging current: 110mA; Termination current: 18mA;
    Minimum discharge voltage: 1,1V; Capacity test: 110mA at discharge to 1.30V
    http://www.produktinfo.conrad.com/da...900MWH_4ER.pdf

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