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Thread: Disassembly of some UltraFire batteries

  1. #31
    Flashaholic* KeepingItLight's Avatar
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    Default Re: Disassembly of some UltraFire batteries

    Quote Originally Posted by Dr. Tweedbucket View Post
    Sick thread!

    I have two Ultrafire 3000mA blue batteries and they seem to work fine (one at a time) in a Fenix that I have. Still, I'm paranoid, so I weighed them and one weighs 20grams and the other about 30. I weighed an Xtar that I bought and it was the proper 47g. I may just boot them out the door and be done with it.... they were only $5 from Amazon.
    In my opinion, the sooner you do that, the safer you will be.
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  2. #32
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    Default Re: Disassembly of some UltraFire batteries

    Love the cheap batteries for el-cheapo flashlights. (With single battery) but would only ever run quality 18650's in any flashlight that runs in series! Thanks for the write-up! Very interesting!

  3. #33
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    Default Re: Disassembly of some UltraFire batteries

    Quote Originally Posted by eva2000 View Post
    thanks for the review, definitely an eye opener

    I was in market for a new flashlight and was choosing between sticking with normal nimh AA based flashlight or going for 18650 powered ones and there's so many 18650 brands out there. I know which I won't be buying

    Oh man!!! (or woman) Don't let that scare you away!!! I've been using 18650's for a LONG time and will never go back! Once I found these cells it opened up my flashlight world to something completely different and much better! There are plenty of quality 18650 cells to purchase! I use Xtar's in my multi-cell lights, but to be honest I use a bunch of ultrafire's in my single cell lights too.

  4. #34
    Administrator Kestrel's Avatar
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    Default Re: Disassembly of some UltraFire batteries

    Quote Originally Posted by HKJ View Post
    [...] The 3000mAh cells may be old quality cells, but they must not be used in series due to the huge difference in capacity. Neither type must be used in series due to the missing PCB protection.
    When I read threads such as these, I am amazed that there aren't 10 times more of the severe 'flame'-related accidents in the general news.

    HKJ, was it you who posted the 18650 disassembly pics that had mini-cells inside, or dirt/flour/etc ?
    Last edited by Kestrel; 11-18-2015 at 04:06 PM.

  5. #35
    HKJ's Avatar
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    Default Re: Disassembly of some UltraFire batteries

    Quote Originally Posted by Kestrel View Post
    When I read threads such as these, I am amazed that there aren't 10 times more of the severe 'flame'-related accidents in the general news.
    Cells do generally not explode. Here are some of the test a cell must handle (From a Samsung datasheet):

    9. Safety
    9.1 Overcharge Test
    Test method: To charge the standard charged cell with 12V and 2.8A at 25℃
    for 2.5 hours.
    Criteria: No fire, and no explosion.
    9.2 External Short-circuit Test
    Test method: To short-circuit the standard charged cell by connecting positive and
    negative terminal by less than 50mΩ wire for 3hours.
    Criteria: No fire, and no explosion.
    9.3 Reverse Charge Test
    Test method: To charge the standard charged cell with charge current 2.8A
    By –12V for 2.5 hours.
    Criteria: No fire, and no explosion.
    9.4 Heating Test
    Test method: To heat up the standard charged cell at heating rate 5℃ per minute up to
    130℃ and keep the cell in oven for 60 minutes.
    Criteria: No fire, and no explosion.


    For the above test the cell will most likely vent.

    Quote Originally Posted by Kestrel View Post
    HKJ, was it you who posted the 18650 disassembly pics that had mini-cells inside, or dirt/flour/etc ?
    No, I have not succeeded in getting my hands on some of these cells.
    My website with battery, charger, usb reviews, comparisons & information: lygte-info.
    Latest addition is multimeter reviews

  6. #36
    Flashaholic*
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    Default Re: Disassembly of some UltraFire batteries

    Quote Originally Posted by HKJ View Post
    Quote Originally Posted by Kestrel View Post
    HKJ, was it you who posted the 18650 disassembly pics that had mini-cells inside, or dirt/flour/etc ?
    No, I have not succeeded in getting my hands on some of these cells.
    Here's a post from tandem with Ultrafire disassembly videos from YouTube:

    http://www.candlepowerforums.com/vb/...=1#post4586552

    Maybe those are the cases you're thinking of?
    Phlogiston is the main constituent of Magic Smoke.

  7. #37

    Default Re: Disassembly of some UltraFire batteries

    These Ultrafire batteries are a bit of a mine field, the amount of horror stories about them both on Youtube and in forums like this one are huge.

    I would never buy an Ultrafire 18650 battery but my experience with them has not been too bad. I have 4 18650 powered flashlights that I have bought very cheaply from Ebay, they all arrived with Ultrafire 2400mah batteries and cheap two battery chargers. Two of the lights use a single battery and two use two batteries. I had no idea of the dangers of these batteries so I just used the lights and when finished I stuck the batteries in the charger overnight and put them back in the light next morning. These lights and batteries are now between 3 and over 7 years old.

    After reading about the dangers of these batteries I went out and bought a good charger, a Nitecore D4, and now use that to charge the batteries. All the batteries still give a full light for a useful amount of time and I see no reason to replace them yet. My lights are used for fishing, camping and hunting duties and most times for less than an hour at a time.

    On the charger all the batteries charge to between 4.1v and 4.2v though the older batteries drop to 4v after a day or two.

    I will only buy quality batteries when I do eventually replace them but even that is not so easy, it would appear that most name brands sold on line are fakes as well unless you buy from a distributor.

  8. #38

    Default Re: Disassembly of some UltraFire batteries

    Plenty of places to buy authentic grade A batteries. The people getting burned are the ones constantly looking for that unbelievable deal. At the end of the day one usually gets what they asked for. Buy cheap, get cheap,

  9. #39
    Flashaholic* RI Chevy's Avatar
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    Default Re: Disassembly of some UltraFire batteries

    You get what you pay for!

  10. #40
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    Default Re: Disassembly of some UltraFire batteries

    HKJ, have you tested the EBL 3000mAh 18650 batteries?

  11. #41
    HKJ's Avatar
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    Default Re: Disassembly of some UltraFire batteries

    Quote Originally Posted by portlandmade View Post
    HKJ, have you tested the EBL 3000mAh 18650 batteries?
    No, I have not been looking at EBL batteries.
    My website with battery, charger, usb reviews, comparisons & information: lygte-info.
    Latest addition is multimeter reviews

  12. #42
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    Default Re: Disassembly of some UltraFire batteries

    I'm new to the forum and appreciate the information on these. These are the batteries in one of my lights and I clearly need to upgrade.

    Thank you

  13. #43
    Enlightened PaladinNO's Avatar
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    Default Re: Disassembly of some UltraFire batteries

    I looked this up on eBay for fun, just to see what's out there...
    Am I allowed to post eBay links here, even as a warning?

    The scam - sorry, I mean advertisement, was as follows:

    -------------------------------------------------------------------------------------------------------------------

    2X 18650 9800mAh Li-ion 3.7V Rechargeable Battery For Flashlight Torch Laser RC

    "Battery Features:

    Manufactured by Hi-Capacity power products.
    100% brand new yellow color 18650 3.7V Li-ion 9800mAh rechargeable batteries
    100% quality Japanese battery cells
    100% Q.C. of every battery
    Capacity: 9800mAh
    Voltage: 3.7V
    Chemistry: Li-ion
    Recharge up to 1000 cycles
    Size: Approx. 6.6 * 1.8cm / 2.6 * 0.7in (Height * diameter)
    No memory effect(Do not run it to out of power, or it would not be charged again)
    Widely used on torch, laser pointer, as emergency lighting and other portable devices
    For appliances like Flashlight Torch Light,Cameras,RC Toys, Remote Controls, MP3 Players etc.

    Package included:

    2 x 18650 9800mAh 3.7V li-ion rechargeable battery

    Price:
    US $4.50

    -------------------------------------------------------------------------------------------------------------------

    How...as such people even allowed to do this, when these are obviously fakes - and dangerous at worst?

    I hear the voice of an old, wise man in my head, saying "welcome to the real world, son!".
    I'm sorry, but I just got a huge problem with scammers and liars, and needed to vent a bit.

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