Charger for mobile phone batteries - a little wiser “frog”

Model - YJ-668A
Power supply - 110-220 V
Charging voltage - 4.2 V
Charging current - 350 mA max
Measurement and indication of the voltage on the battery and the current pumped into it.
LCD display with blue backlight.
Finally, the dream of an amateur to come true has come true ...Uh-uh, in general, battery capacity. Intellectual charging for acceptable money appeared in the form factor of the familiar “frog”. But there are quite "tasty" differences. Testing, in fact, completed. Summary: The device requires dopilivaniya to the mind.

The prehistory is pretty short. Looked at the at the time of the recent sensational "sale". It is clear that this attraction of unheard of generosity is a solid bluff. But! Say to the Russian man: “KHALYAVA” - he will jump out of his pants. Of course, the most tidbits like Samsung Nout for 99 bucks or Galaxy 3 for the same "stolnik" did not open the mitten. This is an obvious deception, why the heck are upset. Having looked through the catalog, I saw this device. There he was, if not lie, for 3 bucks. Set out to catch. The start of the sale fell on a deep night. I did not wake up, scored.
So, let's begin.
This find came surprisingly quickly. 14 days! I just could not believe my eyes. Russian Post learned to work? Oh, nafig. Surely Mars somewhere in the constellation of Capricorn successfully stood up. And the mail - I have there another package right in the air dangles. Already from 28.08.2012. Until now, a plane from China cannot land ... On Monday, if it does not start tracking, I will start scribbling them again. So as not to relax.
It was packed as usual - in a yellow envelope "small package" with pimples from the inside. And the device itself, as it turned out, was in a cardboard box of awesome rigidity.
A pair of pictures of the container

And inside the charging itself was wrapped the samepimply film. What is clearly not provided for in this package. I tried the seller. He, apparently, the business is just beginning - so he tries. Until. Well, since he took out the charge from the package, he probably checked it out. In addition, I put a standard adapter with a flat charger plug on our round "legs". Which, again, is a plus.
On the back of the box are all in hieroglyphs. From something familiar - only the numbers and the manufacturer’s website, where I found a couple of pictures and a description - To get to the manual and failed. Among the hieroglyphs there are a couple of numbers - 3000 mAh and 2000 mAh. The first digit clearly indicates the maximum capacity of a rechargeable battery. The second probably also means something. But what? Okay, we'll find out later ...
Screen, clothespin, sliding contacts, fixed contacts for Nokia aks.
Bottom folding legs. Flat. It is a pity that not round. There are such, but not on this model.
A hologram on the belly is terribly disturbing to read the letters. And sfotkat - generally a problem.
I tried the spring clip. Obviously more powerful than the usual "frog" for 2-3 bucks. It's good. For a big battery tends to pop up. And for this charge it will be very bad - the meter readings will fail. The device does not have the function of memorizing the previous value or something similar. If you do not tear the battery from the contacts, but remove the charger from the outlet, the numbers go out. When plugged back into the outlet, the numbers will appear and the values ​​will be saved. But if the battery itself due to poor contact falls off the charger (even if it is included in the network), the counter value will immediately reset. And the countdown will start over. There is no one button to turn off or wake the LCD backlight, memorize values, etc. Therefore, the cycle can not be interrupted. Lost all meaning from the charge of this device.Here, by the way, the very fixed ones are visible.contacts for Nokia batteries. There they are, just above the moving ones. They clap the battery. You open the clothespin, you stuff the ack at the very throat (there is a limiter), you close the clothespin.
And it turns out that the plastic tide with a screwon the clothespin, securing the moving contacts, just presses the battery and does not allow the clothespin to slam shut more. Therefore, the moving contacts do not deteriorate.
Connect the battery. The blue screen lit up. It will glow continuously while the acc is connected. Well, or until it is completely discharged. Tsiferok yet. It is just a contact indicator.
We stick the "frog" with the battery in the mouth to the socket.
Now tsiferki appeared. In appearance almost coincide with the fact that the manufacturer’s promotional photos. Viewing angles are useless. It is necessary to look from top to bottom, at an angle not at 90 degrees, but, perhaps, at 60-70. Otherwise, everything fades. And there are no corners either.
Judging by the experience of communicating with other "frogs", they do not care about the polarity of the battery connection. This one too.
There are 3 display groups on the display:
1) A large battery of 4 segments. Charge animation and approximate filling estimate. First, it is switched on in an incremental manner, segment-wise, from the side of the bottom of the battery to the “plus” side. Then, as the charge, the segments remain on. First, first and second, first-second-third, etc. While the battery has not been charged, the fourth one flashes once every two seconds. Then he goes on a constant. Then charging seems to be complete. However, as a result of observation, I saw a periodic, once every five to ten minutes, wink of the fourth section. Apparently, it is trying to do a trickle charge. And it does not mean that it is so conceived. Hardly. Most likely a side effect. The charger itself is no more sophisticated than the usual "frog". Just on the ordinary, we do not see it. And here everything is in sight. By the way, you can see the backlight shake about once a second. Explicitly performs a cyclic measurement. The meter of swallowed electricity no longer grows.
2) Voltage on the battery. Shows quite correctly.
3) Counter current flow. I would like to experiment on it. Something he will show us? According to the manufacturer, the error may be about 2%.
Stick to the sample is almost not discharged.800 mAh battery. Heating of the charger is observed in the area under the screen. The temperature is low, up to 40 degrees. Fired does not stink, it smells like a brand new warm plastic. And here lies another trick from the Chinese. The cooling gills are not located where they are needed! They needed to be located under the part of the device where the screen is located. There all low-voltage part of electronics. And on the top cover it was necessary to make breaks for the air. And the Chinese have no convection observed. The solution can be a careful making of a pile of holes on the entire bottom and part of the upper surfaces of the case.
And now proceed to disassembly. It is necessary to find out how everything is arranged there.
Screw one, over the feet of the fork. Separate the halves. To do this, simply twist them relative to each other at a small angle, unscrew the inner screw (it presses the lamellae of the folding legs) and pull off the top relative to the bottom - there is a pair of guides. Do not snap! Do not attempt to screw on with a screwdriver.
Fold back the empty belly. On the upper part remained all the electronics. Look around. Well, damn, the Chinese. And here it is frightened. It seems like a good technodevice ... And snot, snot! Traditional Chinese hot melt glue. He is everywhere. Details are all lying around. The legs are cropped somehow. The soldering is not something that the “wave”, but generally looks more like a hand-to-hand one. The flux is just islands. Solder pieces and on the board are stuck and on the contacts with hefty balls.
In the photo you can see two submodules - the charging itself and the indicator part. On the charge board all the details are side by side. Transformer very small envelope. But, IMHO, indicated on the label 350 mA of the maximum charging current should pull. A six-wire rigid flat cable a la "Dandy" connects to the controller board. On the display module board, there is a blob with a packageless chip, again as in the Dandy.
Another very unpleasant moment. The moving contacts have an input to the housing for soldering. When you open / close the clothespin, the contact plates go back and forth. And right below them - the power transistor and the power capacitor. High Voltage! Nothing covered! Elementary we can get the contact of the high-voltage part with the contacts of the rechargeable battery. That while snorting - nobody knows. In general, it is simply imperative to isolate.
Putting it back.
Test number 1
Let's try to charge the battery, which has a capacity of approximately 1900 mAh. This is from my i9220. Theoretically, it should be charged hours 6-7. We will count on 8.
I tried the current on the "hungry" battery. Yes, 350 mA. Started with a voltage of 3.5 V. The swallowed electrical energy (in the sense of its meter) gradually increases. Every 5-6 seconds is added one. As the charging current falls, the rate of rise of the meter naturally decreases. When measuring the voltage, I notice that the device overestimates the readings on the screen by about 0.05 V. If it shows 4.2 V, then the tester seems to be 4.15-4.16 V. And this, honestly, can lead to undercharging of the battery. Although drip charging might help.
Watching further.
Went warming up. 45 degrees approximately or slightly more. Not hot, but tangible. Stink is not the beginning of what pleases.
Naturally, the minus of such a design"Frog" I see a contact pair. In combination with a clothespin, they do not behave well enough. The more battery - the more he wants to fall off. I am becoming more and more entrenched in the thought that I will have to stick the stuffing from this device into the body from this: He has a much more confident clamp in operation. But my battery does not fit into it - I had to quickly bend the brace from the paper clip and then everything came up as it should.
The night has passed.
Or rather, 8 and a half hours.
Charge like. We look at the capacity - 1615 mAh. Something I don't like it. When charging the same battery using Turnnigi, it showed 1830 mAh on charge. Nifiga se promised by the manufacturer 2%! As usual, in the discharge of Tournigi shows even less - about 1780. That's why he and efficiency. It is always poured more than pours out. But even this value does not converge! Well, okay, you can make a few assumptions:
1) Charging started from the moment it was not completely discharged. In the test with Tournigi, I discharged the battery up to the prescribed 3.0 V with a current of 1 A. A little lower - and the protection of the controller built into the battery could work. It also discharged just before turning off the phone. The phone could simply be safe and cut the light off early in order to have time to complete the tasks. IMHO, this is the main reason.
2) Bothers me here is the desire of the deviceoverestimate the voltage by 0.05 V. From this, as I have already mentioned, chronic undercharging can happen. That also does not add readings to the counter and the life of the battery in the end.
In general, the comparison did not meet equivalent starting and ending conditions.
Test number 2
I found in the box a fresh battery for Nokia BL-5J. 1350 mAh SCUD. It must be rated or even slightly larger capacity. Lay for experiment, absolutely new. Charged by about 3/4. I drove it in Tournigi, pumped out 861 mAh discharge at 1A. Then another 38 mAh current 0,2A. In general, almost completely. I put it in this charge (and took an extra photo or two), plugged it into the socket and went to sleep. In the morning I got up - on the display - 1422 mAh. This is clearly close to par value. About SCUD it is known that they really exceed the declared capacity. The discharge on Tournigi showed 1427 mAh. In principle, it usually happens. The discharge and charge differ from each other not much. That's just when the charge should be a little more. Here - almost flush. The margin of error, however ...
So let’s put an intermediate line:
+ availability of charge control (voltage, filling, capacity)
+ versatility, thanks to the “frog” form factor
Actually, the “pluses” end there.
- overcharge
- too low performance - 350 mA of charging current - it's for chickens to laugh
- the need to carry the adapter from the flat plug to the round
- inferior workmanship and even a couple of potentially dangerous places
- “frog” form factor does not perform well when charging large massive batteries
- the dimensions of the charger exceed the usual "frog" and a half to two times
- disgusting viewing angles of the LCD, and even the tail of the clothespin interferes with the look at the monitor (there is a thought to just cut off this tail and work with the clothespin, clutching right behind the transparent jaw)
Except for the geeks - nafig to anyone this device is notneeded! For a geek, it seems even a little, for an ordinary person - he is cute, but nothing sensible compared to two to three times cheaper “frogs” of the old sample. Yes, a gold or silver bezel, blue screen, folding legs. Glamor, edrenat. But frankly weak, weak devaysik. At 2-3 bucks, not higher. Charging takes seriously longer than on more powerful devices. Should you always use such a slow charge, getting in return only an opportunity to find out the approximate battery capacity - you decide. I expressed my opinion: it would be more powerful and the principle of clamping contacts is different. Well, our plug would be round. There would then really be a charger for permanent use. Others would not be needed.
Thinking out loud:
Definitely need to jot down a scheme, understand the principlecounting parrots. If possible, transfer the indicator module to the case of another charge. This is possible if the device really measures the charge current. This idea is supported by the presence of a 0.22 ohm resistor indication module between the middle legs of the plume of the display module. Shunt, apparently. Then he doesn't care with whom to work in a pair. It will be possible to increase the charge current, etc.
I will add.
There is no current limit fromcontroller or something else. The controller only works as an indicator. He cannot control the charge. There is a bridge of transistors SS8050 / SS8550 for automatic reversal of polarity. Well, the little things. So you can recognize the findings of the display module and attach it to a more powerful charge. By the way, the reversal of battery polarity does not affect the meter. All the same measures. When the battery is connected, the monitor starts working, but in some kind of slip. Only data storage and nothing more. When plugged into the outlet, the power to it increases from 3 to 4.75 V. The screen brightens up more brightly, the animation begins.
Photo board and display module