Elektroda.com
Elektroda.com
X

Search our partners

Find the latest content on electronic components. Datasheets.com
Elektroda.com

Plastic flashlight-powerbank from China for 18650 cells, "800W"

p.kaczmarek2 4356 15
This content has been translated flag-pl » flag-en View the original version here.
  • Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Hello, I will present here a short review and teardown of a Chinese USB rechargeable flashlight that can also be used as a power bank. After opening the case, I will try to analyze the operation of the circuit from the inside and finally I will present a different, slightly better flashlight which I am really happy with the purchase.

    Purchase of a flashlight, first impression
    I found the product on the web under the slogan "5000LM 1500M Powerful Outdoor LED Spotlight 12000mAh USB Phone Power Bank Rechargeable Strong Searching Flashlight". I ordered it in promotion when a shipment directly from the Czech Republic was available:
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    I paid about $ 15. Promotional graphics:
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    At the very beginning, you can probably guess that these 800W and 12000mAh are such an unusual form of marketing that is not reflected in reality. Well, but we will check how it really is ...
    Really, 800W? This is such a portable microwave oven?
    In addition, the supply of watts does not accurately reflect how well it will shine, LEDs have different efficiency.
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Received kit:
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    After wearing the strap:
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    The plastic itself from the case, however, is quite weak, as in the cheapest Chinese products.
    The flashlight is ready for operation after taking it out of the packaging. It actually has different modes of operation, although the front LED seems to glow quite dimly . The side LED is relatively strong, it also has a red light mode.
    Plastic flashlight-powerbank from China for 18650 cells, "800W" Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    In addition, there are several operating modes, light, dark, flashing, all switched with this one button (a long press turns it off / on, a short press turns on the next mode).
    The USB socket on the housing provides a stable 5V to about 0.9A:
    Plastic flashlight-powerbank from China for 18650 cells, "800W" Plastic flashlight-powerbank from China for 18650 cells, "800W"


    The inside of the flashlight
    I started the teardown by dismantling rubber (actually rubber - it's not just plastic ornaments) protections:
    Plastic flashlight-powerbank from China for 18650 cells, "800W" Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Ultimately, however, one screw holding the housing is visible after removing the foot:
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    the second after removing the front rubber protection:
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Interior:
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Button:
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    There is one electronics board inside, everything is connected to it via connectors:
    Plastic flashlight-powerbank from China for 18650 cells, "800W" Plastic flashlight-powerbank from China for 18650 cells, "800W"
    It is strange that the manufacturer allowed himself to buy connectors. Probably the only advantage of this product. Wouldn't it be cheaper to solder the cables to the PCB?
    Plastic flashlight-powerbank from China for 18650 cells, "800W" Plastic flashlight-powerbank from China for 18650 cells, "800W"
    The cells inside are ICR 18650 2200mAh 3.7V and are fully replaceable which is a plus. You can't trust the capacity printed on them, but even if you trust it, it comes out of 4400mAh and not the promised "12000mAh". Of course...
    Plastic flashlight-powerbank from China for 18650 cells, "800W"



    Several measurements
    Out of curiosity, I checked approximately what current at what voltage is taken from the cells in the case of the two brightest modes of operation:
    Plastic flashlight-powerbank from China for 18650 cells, "800W" Plastic flashlight-powerbank from China for 18650 cells, "800W"
    At 4V, the side LEDs take 1.3A and the front LEDs take 1.7A. There is not even 8W, let alone the mythical 800W ... here the seller really "flew away".

    Tile on the inside
    I put the most important information and connections on the photo of the plate. I think this is enough to understand how the system works.
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    The system consists of:
    - an unsigned element in the SOIC8 housing that looks like a microcontroller (a button is connected to it, it turns on the transistors mentioned)
    - transistor Y2 (actually: SS8550; to turn on the side red light)
    - MOSFET with P channel A1SHB (actually: HM2301B, Si2301DS; for switching the side white light)
    - two MOSFETs with N channel A2SHB (actually: SI2302DS, GMS2302AL; connected with leads, to switch on the main LED).
    - an unsigned element in the SOIC8 housing that looks like a charge controller / step up converter, through it the current goes from VIN to the battery, and from the battery to 5V (there is a larger 2R2 choke, which suggests that it is a step up converter, of course you also need a rectifying diode and a keying transistor, but they are probably integrated in this system)
    From the smallest detail, I can see that a capacitor was used here to eliminate the vibration of the main button contacts, and I think that's it.
    I do not like this system a bit, I do not see any protection against over-discharge of the cell here ... unless this microcontroller does something in this direction, or maybe the Chinese assumed that the voltage drop on the diodes will not allow the cell to discharge? I have the impression that the LEDs here have to be current-controlled, which is also evidenced by the presence1? shunt resistors, which are used to measure the current (by measuring the voltage drop across them) using the ADC from the flashlight controller. If this is the case, then until a certain point we will not see that the flashlight shines darker with the discharge of the cells, because the current flowing through the LEDs is constant - unless the cell is just discharged excessively ...
    The system could be analyzed more deeply, measurements could be taken, but I decided that it was enough for me to satisfy my curiosity.

    Is there any other flashlight worth recommending?
    I think that everyone can agree that the flashlight in this topic is generally of poor quality. So one could wonder if you can buy something better at a similar price?
    Of course, yes - some time ago I bought a NexTool NE20030 flashlight which I really appreciate .
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    When I was buying it, it was shipping from the Czech Republic and it was a bit cheaper ...
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Initially, I even wanted to do a test and a photo gallery from inside to this section, but ... I am not able to disassemble it (no screws, hooks, anything?), It's a pity to destroy it:
    Plastic flashlight-powerbank from China for 18650 cells, "800W" Plastic flashlight-powerbank from China for 18650 cells, "800W" Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Here, of course, the housing is made of metal and solid. Magnets for putting away the flashlight too, I keep it always "glued" to the metal leg of the table.
    This flashlight is really strong, it still serves me when I go to the basement or the attic. The beam of light is so strong that when you spend a moment in one place, it heats up.

    Summary
    I didn't expect much from this flashlight, and I ordered it out of curiosity, but I still think it is weak. Maybe it is because of the aforementioned NexTool NE20030, which I praise myself quite a bit. However, it turned out that the lantern from this theme is more of a toy that focuses on appearance and appearance. This main front LED is really weak. In addition, I have some reservations about the layout from the inside. Probably its only advantages are that the cells are replaceable, so it is not such a total disposable. It's good that I was buying it on promotion with shipping from the Czech Republic and not for the full price. Maybe someday it will be useful for something more than shining a moderately bright beam of light and, for example, I will remake the system and put more cells and a stronger LED inside? There is room for more ....
    As for 12000mAh - of course, the seller lied. The cells themselves (if you believe the label) have 2 * 2200mAh. But to check it, you didn't even have to open the case, just weigh it or just know how it ends with buying such a miracle from China.
    Unfortunately, I have nothing to measure the light level itself.
    To sum up, I will not use this "flashlight" myself, especially since I have my own Nextool, but I think that as a toy for a young one (not mine, not this age yet), it may work well.

    Cool? Ranking DIY
    About Author
    p.kaczmarek2
    Level 26  
    Offline 
    p.kaczmarek2 wrote 1720 posts with rating 3439, helped 94 times. Been with us since 2014 year.
  • #2
    puszak
    Level 28  
    You could be tempted to replace the front LED with something specific, there is a place for a heat sink, put brand cells in it and it would be a pretty cool flashlight. These factory blue Chinese, even by weight organoleptically, are noticeably much lighter than, for example, branded 2 Ah.
  • #3
    sq3evp
    Level 23  
    Good 18650 cells weigh almost 50 g - such "9800 mAh" weigh something about 32 g. In my opinion they have a maximum of 1000 mAh.
    I have a few cells and these few grams of weight is a big difference in capacity compared to the weak and the good ones.
  • #4
    KonradGatek
    Level 27  
    p.kaczmarek2 wrote:
    "5000LM 1500M Powerful Outdoor LED

    5000 LM for a regular bulb (10lm / W) is about 500 W. For a Chinese 6lm / W it will be just 800 W.
  • #5
    tmf
    Moderator of Microcontroller designs
    p.kaczmarek2 wrote:
    I do not like this system a bit, I do not see any protection against over-discharge of the cell here.

    Maybe they are based on a security built into the cell.
    Thanks for such a teardown, it opens your eyes to the crap they're offering. If the housing were decent, it could be used as a base for building your own flashlight. And so it only adds to the amount of garbage on the planet.
    On the other hand, there are a lot of decent flashlights for two 18650 cells on ali, much smaller, therefore more handy, waterproof, in an aluminum housing. Generally, there are a lot of nice things, you just need to turn on the nonsense filter - if the seller gives the parameters from the hat, you know what he is selling.
  • #6
    szeryf3
    Level 25  
    The advantage of this flashlight is that it has replaceable batteries.
    You can also think about adding batteries to increase its capacity.
    The downside is the housing that will not give up the heat generated by the LEDs.
    There can be fish for the young.
  • #7
    spec220
    Level 25  
    p.kaczmarek2 wrote:
    At the very beginning, you can probably guess that these 800W and 12000mAh are such an unusual form of marketing that is not reflected in reality.

    I think 8,000 mW and 1,200 mAh.
    Vendors just "bits" in the CPU register migrated from mW to mAh hehe .. :D
  • #8
    Jawi_P
    Level 35  
    Well, a nice test, warn you not to buy. However, I am puzzled by something else.
    What prompted you to buy something that was already described at the time of sale is as is. After all, the description of the product itself is a mockery, I would not think to pay a Chinese 100% due to the parameters described. And with such a purchase, we let the seller understand that his "marketing" works.
    If this was followed by at least a discussion with the seller and the return of goods at his expense or an attempt to recover the cash, negative comments, etc.
  • #9
    duble2
    Level 9  
    Nice factual description or maybe someone ordered a recommendable flashlight from China and could boast of it?
  • #10
    E8600
    Level 39  
    p.kaczmarek2 wrote:
    an unsigned element in the SOIC8 housing that looks like a charge controller / step up converter, then the current goes through it from VIN to the battery, and from the battery to 5V (there is a larger 2R2 choke, which suggests that it is a step up converter, of course you have to also a rectifier and a keying transistor, but they are probably integrated in this circuit)

    It could be a deal HT4921

    I would stick to the measurement of the current / voltage on the battery, unfortunately these converters do not sin efficiently and it would be useful to measure how much goes directly from the LED converter, in my opinion much less.
  • #11
    Jawi_P
    Level 35  
    duble2 wrote:
    someone ordered a recommendable flashlight from China and could show it off?

    I bought a Convoy S2 + on the SST40 diode, I gave it about PLN 60, I do not know how much they are now. I bought it because the price-quality ratio is amazing.
    Well-made, all aluminum, lots of spare parts to buy separately, lots of descriptions of modifications, if you like. Overall, I recommend all Convoys. I think I'll buy another one myself. Bought on banggood, more confidence that you are buying what you pay for.
  • #12
    tmf
    Moderator of Microcontroller designs
    I was buying the following:
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Aluminum, O-rings, shines well, the power supply is two 18650 batteries. When I bought it, it was up to 100 m, now I see that it is carried by them and they say that it is up to 200 m :) At 60 m it worked ok. The construction is solid and I do not complain.
  • #13
    Jawi_P
    Level 35  
    But now they can be on xhp70.x ;) , and the 70.3 version can take 45 W and give> 5000 lm
    The only problem is that the Chinese sell flashlights for the price of the diode itself, so it is difficult to believe in the originality of the product.
  • #14
    Tomek515
    Level 23  
    tmf wrote:
    I was buying the following:
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    Aluminum, O-rings, shines well, the power supply is two 18650 batteries. When I bought it, it was up to 100 m, now I see that it is carried by them and they say that it is up to 200 m :) At 60 m it worked ok. The construction is solid and I do not complain.

    They came out in different versions, I don't know which one I have, but it's really cool. Admittedly, more for lighting from a distance.
    There are many good flashlights from the Chinese. It's hard to name one, because there are many of them, but the better ones are not ultra-cheap either.
  • #15
    p.kaczmarek2
    Level 26  
    @jawip, you've hit the nail on the head - I use the Dispute (on Ali ...) or "Return or repair" (on Ba ...) options quite a lot against dishonest sellers. On Ali ... it is very easy to get a refund in PLN to a regular bank account (even for the lack of a package after 60 days), on Ba ... you will not get a $$ refund, but you will get the equivalent value in points to spend on your next purchase ( supposedly there is a "return or refund", but customer support offers these points, I even haggled with them about the number of these points). As for the lamp from the topic - initially I neglected reporting, but all in all ... we will see how it goes:
    Plastic flashlight-powerbank from China for 18650 cells, "800W"
    (I gave with photos from the inside and 2200 * 2! = 12000)

    In various situations, I reported problems to the customer service (e.g. when I received a power tool without packaging as in the pictures from the offer) and it always resulted in some kind of return on their part. Even as I used to buy the so-called "grab bag" of electronics and they gave me a completely different product than in the photos, it also went.

    However, I have never returned the product (or exchanged for another one), it always ended up with an agreement on returning $$.

    And since we have already touched on the subject of product returns and costs, I would like to add that I have the worst experience with this on Polish websites and on eBay.

    I also had a Gear once ... - they didn't send the product or return it to Paypal until I told them directly, but finally they refunded the entire cost (it was probably an air purifier filter).

    @ duble2, this Nextool, which I showed at the end of the topic, is also with Ba ... and I'm happy with it. I also have the impression that it is more handy than the "5UV 5L2 5T6", fits into the pocket well (the "head" does not stick out, because it is not there), you can stick it on strong magnets for the fridge / table leg, and it has a 5V output USB and I have already used it in emergency). Of course, there is also focus on the beam of light, which I also use. It is only important that you buy "50% off" periodically and look for a shipment from the Czech Republic or Poland. Unfortunately, I do not have any solid data on what the power of light really is there and all this is my subjective opinion.

    @ e8600 let's say that this is a measurement especially for the benefit of the seller, I wanted it to come out at least the 8 W, then you could say that he was suddenly wrong about two zeros .
  • #16
    noel200
    Level 25  
    Hello, thanks for the description, I was curious about this flashlight myself.
    And I have a question, how to measure it with such or similar light source? I am asking for the amount of light. I have a Mastech MS6612 luxmeter and I use it to compare, for example, LED lamps to a flat.
    I supply the light source with a wattmeter and set the luxmeter one meter from it and compare it in a dark room. I return the deceptive ones to the store and leave the glowing ones as I need them.
    How to get lumens with a luxmeter?
    greetings