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Thread: Dissapointed with Fenix FD45; Resolved: battery issue

  1. #1

    Default Dissapointed with Fenix FD45; Resolved: battery issue

    When I first opened the package and started to use and test the light, I was very happy about my purchase. But very soon after I realized there is a problem... The light barely manages a minute or two on turbo mode, even though the manual states at least an hour. I tested the batteries and they were 1.24v for all 4. It seems with this light it will only go into turbo mode with freshly charged batteries. This cannot be right? I then took the batteries out and tested them in my TK40. The TK40 can work with 4 batteries also. It goes and stays into turbo mode on my TK40 no problem. So either my light is faulty or it's not a great light. I am very dissapointed.

    EDIT: The problem was not the flashlight, but me using inferior NiMH batteries which could not deliver the amps this light needs in turbo mode. By switching to Eneloops did the trick.
    Last edited by lightseeker2009; 05-25-2018 at 09:03 PM.

  2. #2

    Default Re: Extremely dissapointed with my new Fenix FD45

    Could be faulty or they are omitting from the specs that it probably will step down to somewhere between 900 and 300 lumens for 90 minutes. Not the first time a manufacturer would fib to get extra sales.

  3. #3

    Default Re: Extremely dissapointed with my new Fenix FD45

    I was told to rather use Alkalines. Will voltage drop not cause the same problem? And then, the 90 minutes runtime claimed by the manufacturer was done using NiMH.

  4. #4
    ven's Avatar
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    Default Re: Extremely dissapointed with my new Fenix FD45

    Alki leaks wont hold any decent amount of turbo with sag, not only that they cal leak! Eneloop pros would be the better choice for a higher output AA light(or even regular eneloops).

    But what ever the cells used, 900lm will not be held longer than a few mins due to heat. 900lm is a big output for a compact light, physics gets in the way.

  5. #5

    Default Re: Extremely dissapointed with my new Fenix FD45

    ......................
    Last edited by klrman; 05-25-2018 at 07:27 AM.

  6. #6

    Default Re: Extremely dissapointed with my new Fenix FD45

    Quote Originally Posted by ven View Post
    Alki leaks wont hold any decent amount of turbo with sag, not only that they cal leak! Eneloop pros would be the better choice for a higher output AA light(or even regular eneloops).

    But what ever the cells used, 900lm will not be held longer than a few mins due to heat. 900lm is a big output for a compact light, physics gets in the way.
    I agree. Even my 8 cell TK40 can sustain Turbo mode only for a few minutes. And its got ''only'' 630lm.
    But to refuse Turbo mode, even if cold? That should not happen I'm sure.

  7. #7
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    Default Re: Extremely dissapointed with my new Fenix FD45

    Quote Originally Posted by lightseeker2009 View Post
    I agree. Even my 8 cell TK40 can sustain Turbo mode only for a few minutes. And its got ''only'' 630lm.
    But to refuse Turbo mode, even if cold? That should not happen I'm sure.
    Problem is 900lm is just too much for alki cells, they are not good for any higher ask application(remote controls and clocks are good for alki cells). Have you any sanyo eneloops?(white or the black pro). If not they are pretty much a must for this type of light. It will transform your disappointment to happiness for $15 or so. The sanyo's are not the cheapest, but within reason, the best! Buy once cry once as Chris says.

  8. #8
    ven's Avatar
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    Default Re: Extremely dissapointed with my new Fenix FD45

    This is what you want


    Problem sorted

  9. #9

    Default Re: Extremely dissapointed with my new Fenix FD45

    Quote Originally Posted by ven View Post
    Problem is 900lm is just too much for alki cells, they are not good for any higher ask application(remote controls and clocks are good for alki cells). Have you any sanyo eneloops?(white or the black pro). If not they are pretty much a must for this type of light. It will transform your disappointment to happiness for $15 or so. The sanyo's are not the cheapest, but within reason, the best! Buy once cry once as Chris says.
    My TK40 is stoked with 8 of them (2000mah white Eneloops) I could only find the others in a radio control transmitter this morning. I am at work now, so I will charge them after work and put them to the test.
    No self respecting longstanding CPF member will be without Eneloops

    But can normal non Eneloops be really so bad to cause this? I used Turnigy 2200mah NiMH's. If only Eneloops is good enough, should Fenix not state it like that?

  10. #10
    ven's Avatar
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    Default Re: Extremely dissapointed with my new Fenix FD45

    Having tried different nimh's over the years, i wont even buy anything other than sanyo these days. Too many poor experiences, most lately a panasonic AAA nimh that vented(uneducated guess would be aged cell). It got HOT, to hot to actually hold.

    With an 8 cell light the load is spread across more cells(of course), sanyo eneloop white will be fine, more than likely fine in the fd45 as well(4 of). The pro are higher drain, maybe good for 5a or so and 2500mah V the 2000mah of the white loops. Now bare in mind your output is jumping from 600lm to 900lm, using 4 cells not 8. Those factors all contribute to more demand per cell on the pd45.

    Good choice!!! I should have known

  11. #11

    Default Re: Extremely dissapointed with my new Fenix FD45

    .......................
    Last edited by klrman; 05-25-2018 at 07:27 AM.

  12. #12
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    Default Re: Extremely dissapointed with my new Fenix FD45

    Yeah, Eneloops are the only way to go. They can provide 5 amps continuously without too much voltage sag, and for a 4xAA light you probably only need about 3 amps. Other brands may or may not be able to provide the power necessary for high-output lights. Also, Eneloops will last for years, and still provide the necessary power. Most other brands develop high internal resistance after not too long, and won't work in high-power applications. Either regular Eneloops or Eneloop Pros will work well. Get the Pros only if you need the extra run-time, though you'll sacrifice overall lifetime compared to the regulars.

    As for alkalines in a high-power light. What were you thinking!!!!

  13. #13

    Default Re: Extremely dissapointed with my new Fenix FD45

    Quote Originally Posted by WalkIntoTheLight View Post
    As for alkalines in a high-power light. What were you thinking!!!!
    No, someone else suggested it. I just did not fall for it. I have a broken laser distance meter, because of alkalines that leaked.
    I even give away the free batteries that comes for the remotes of TV's etc. I only use NiMH's lately.

    You quoted 3 Amps. Is this about what 900lm will consume while running off 4X AA's in my FD45?

  14. #14

    Default Re: Extremely dissapointed with my new Fenix FD45

    As I am in South Africa, I do not normally have access to all the nice stuff. I've been told Eneloops are also sold rebranded.
    The Duracells in this link. Do you think they might be the rebranded Eneloop Pro's?
    https://www.takealot.com/duracell-24...s/PLID32538367
    At least these are available locally.

  15. #15
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    Default Re: Extremely dissapointed with my new Fenix FD45

    You did not say which type of chemistry you used.

    Other people read it as Alkaline but I dont' see that directly mentioned.

    If so, Alks are just not for performance.

    NiMh are better - somewhat but still not the best there is. Case in point, laptops *used* to have battery packs made of NiMH cells and then switched to Li-ion. And that was a long time ago, maybe 15-20 years ago so it's not exactly "news".

    to get something decent from NiMH, you need tons of them stacked up. Due to the low voltage.
    ****** Malkoff Devices ****** “Learn to light a candle in the darkest moments of someone’s life. Be the light that helps others see; it is what gives life its deepest significance.” ― Roy T. Bennett, The Light in the Heart

  16. #16
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    Default Re: Extremely dissapointed with my new Fenix FD45

    Quote Originally Posted by lightseeker2009 View Post
    You quoted 3 Amps. Is this about what 900lm will consume while running off 4X AA's in my FD45?
    Approximately, yes. It's probably around 2.5 amps, but it certainly wouldn't be more than 3. Depending on the driver, as the battery drains the current could go up (boost/buck), stay about the same (linear), or go down (simple resistor).

  17. #17

    Default Re: Extremely dissapointed with my new Fenix FD45

    Quote Originally Posted by etc View Post
    You did not say which type of chemistry you used.

    Other people read it as Alkaline but I dont' see that directly mentioned.

    If so, Alks are just not for performance.

    NiMh are better - somewhat but still not the best there is. Case in point, laptops *used* to have battery packs made of NiMH cells and then switched to Li-ion. And that was a long time ago, maybe 15-20 years ago so it's not exactly "news".

    to get something decent from NiMH, you need tons of them stacked up. Due to the low voltage.
    I used Turnigy NiMH 2200 batteries.
    I see Fenix recommend you must use their 14500 1.5V Li-ion batteries..

  18. #18
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    Default Re: Extremely dissapointed with my new Fenix FD45

    Just forget NiMH for performance lights. I know many disagree but just go straight some to some Li-ions.

    18650

    17500 or 18500 or 16650, etc.

    for max performance, use multiple cells.

    e.g. I run 3x18650 in my Hound Dog Super.
    ****** Malkoff Devices ****** “Learn to light a candle in the darkest moments of someone’s life. Be the light that helps others see; it is what gives life its deepest significance.” ― Roy T. Bennett, The Light in the Heart

  19. #19
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    Default Re: Extremely dissapointed with my new Fenix FD45

    Quote Originally Posted by etc View Post
    Just forget NiMH for performance lights. I know many disagree but just go straight some to some Li-ions.
    As long as someone is familiar with proper lithium-ion safety, that's probably the right path. A single 18650 has about as much energy as four AA's, and can deliver it much faster.

    But if someone is content with 1000 lumens, then a 4xAA light is just as capable as a 1000 lumen 18650 light. It will just be larger and heavier.

  20. #20

    Default Re: Extremely dissapointed with my new Fenix FD45

    Guys, the flashlight was not the problem. It was inferior batteries. I took the 8 Eneloops I've charged this morning. It is now 20h26 as I posted this. I tested them all on my multimeter to select the four that retained the most power. But I could not choose. ALL 8 gave the same reading. 1.41V. simply amazing. To add, they must be at the very least be 6 years old. Well. Now the light enters turbo mode and stays there. Amazing. Fenix, thank you for the nice flashlight I could buy as a gift to myself

  21. #21

    Default Re: Extremely dissapointed with my new Fenix FD45

    Quote Originally Posted by lightseeker2009 View Post
    As I am in South Africa, I do not normally have access to all the nice stuff. I've been told Eneloops are also sold rebranded.
    The Duracells in this link. Do you think they might be the rebranded Eneloop Pro's?
    https://www.takealot.com/duracell-24...s/PLID32538367
    At least these are available locally.
    If they are made in Japan, then they are rebranded Eneloop Pros. I if you have access to Amazon basics NiMHs, the Japanese made ones are Eneloops, same thing with the Japanese Ikea NiMH's, all should say something about being pre-charged or ready to use along with being made in Japan.

  22. #22

    Default Re: Extremely dissapointed with my new Fenix FD45

    Quote Originally Posted by xxo View Post
    If they are made in Japan, then they are rebranded Eneloop Pros. I if you have access to Amazon basics NiMHs, the Japanese made ones are Eneloops, same thing with the Japanese Ikea NiMH's, all should say something about being pre-charged or ready to use along with being made in Japan.
    Some Duraloops weren't Pros, and there's different generations out there. I've also heard not all Japanese produced NiMH are made to the same spec as Eneloops, but any of the ones that are made in Japan and line up closely with a particular gen of Eneloops seem to be at least extremely close.

    Pedantry aside...

    The white Ikea Laddas (made in Japan, of course) are excellent and sometimes remarkably cheap. Some of the Amazon Basics aren't made in Japan, and they've changed the colours of the good ones around a few times, so be very careful to check the pictures and descriptions! I've seen some other big brands like Energizer selling Made in Japan NiMH that may be... Enerloops? ... but I haven't seen much testing on those. I've built up a collection of good NiMH batteries including from Duracell, Ikea, and Amazon, and it has been much cheaper than getting brand Eneloops.

    Long story short: Low self discharge/precharged NiMH batteries made in Japan that line up closely to Eneloop sizing are very likely rebadged or close enough. Just be very careful making sure you know what you are getting exactly.

  23. #23

    Default Re: Extremely dissapointed with my new Fenix FD45

    Quote Originally Posted by etc View Post
    Just forget NiMH for performance lights. I know many disagree but just go straight some to some Li-ions.

    18650

    17500 or 18500 or 16650, etc.

    for max performance, use multiple cells.

    e.g. I run 3x18650 in my Hound Dog Super.
    I also prefer li-ion cells in my lights. They are very lightweight compared to Eneloop pros and hold more power per mass.

  24. #24
    Administrator Kestrel's Avatar
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    Default Re: Extremely dissapointed with my new Fenix FD45

    Quote Originally Posted by lightseeker2009 View Post
    Guys, the flashlight was not the problem. It was inferior batteries. I took the 8 Eneloops I've charged this morning. It is now 20h26 as I posted this. I tested them all on my multimeter to select the four that retained the most power. But I could not choose. ALL 8 gave the same reading. 1.41V. simply amazing. To add, they must be at the very least be 6 years old. Well. Now the light enters turbo mode and stays there. Amazing. Fenix, thank you for the nice flashlight I could buy as a gift to myself
    Happy to hear that the issue (w/ the batteries) has been resolved satisfactorily.
    If you would be so kind as to add an addendum to your first post along these lines, that would help clear up the conversation moving forward, thanks.

  25. #25

    Default Re: Extremely dissapointed with my new Fenix FD45

    Quote Originally Posted by Kestrel View Post
    Happy to hear that the issue (w/ the batteries) has been resolved satisfactorily.
    If you would be so kind as to add an addendum to your first post along these lines, that would help clear up the conversation moving forward, thanks.
    Done!

  26. #26
    ven's Avatar
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    Default Re: Extremely dissapointed with my new Fenix FD45

    Glad sorted, enjoy your light

  27. #27

    Default Re: Extremely dissapointed with my new Fenix FD45

    I had it constantly on for 30 minutes on high (350lm). Since it is so small I expected it to build up some heat. But now. It barely got warmer than what it started at. I always test a light like this before I use it for ceiling bounce duty during power failures.

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