Charger for mobile — why so fast die?

The house went through many usb charging devices, from the original to not original.
Now all they give out 5 volts of the voltage, the current is hardly allowed:
For example, from tested dead HTC, Samsung, Asus. They were at 2.1 Amps, and 1.5 from Samsung.

Was tested by connecting off smartphone-wire-ammeter-charging.
All branded chargers were given a current of 0.15 A. (i.e. charging the smartphone could last up to 15 hours)
Accidentally got a Chinese nonam (a little) - check - current of 0.55 A (have fun)

So here are the questions:

1. Why do the chargers come with the phone for 1.5 or 2 amperes, if the maximum charge current is still not more than 0.75 And?

2. What breaks in branded chargers that they give the voltage, but do not provide current?

3. Is it possible to charge the battery of the smartphone directly by the method of the frog, for example, current output up to 2A charging voltage of 4.2 V. will Explode if the rechargeable battery from overcharging, because of the three contacts for the battery, I'll use only two + and - ? Or is it better to use a charge controller, such as the former poverbank for one Bank?

4. How do you choose a good charger that will live a long time and will give a honest current?
June 10th 19 at 16:53
3 answers
June 10th 19 at 16:55
connect off mobile-wire-ammeter-charging

Well, what is this crap? Where it is shown the full potential of charging? Where did you get that off, the phone needs to suck from the charging current?

Test resistive load, and even better on a normal dummy load. Then we can talk about the charger.

What test are the results.

The charge current is determined by the charge controller of phone. Generally a slow charge better for the battery, you'll live longer.

If you need a quick charge, then take the phone with quick charge and charger for it. They know how to bully naprugu and pour good currents in the phone. Well, the cable is normal use, not 3 hairs.
June 10th 19 at 16:57
Will tell what I know.

The strength of the current depends strongly on the quality of the cable. Shitty Chinese cable and quality 2A charger will give 0.7-1A. The ammeter in the circuit to measure, can also affect the final resistance.

Prog AccuBattery shows amperage charge/discharge of the phone. Maybe not quite correct, but to compare the quality of the cables/PSU is quite good.

Further, the branded PSUs have separate terms and conditions for the issuance of a maximum current, for example at Samsung need to add a 33 Ohm resistor on the data pins. Because BP and Samsung could not give 2A when charging other (non-Samsung) phones.

Don't know what your situation is, but I have over seven years accumulated a lot of Samsung's phones (SGS, SGS2, SGS3, SGS4, Note2, Note3, Note4, SGS6E+, Note8, Note Pro 12.2 (x2)). One charger is dead, while ditching the phone, and the reason was a broken cable. And it seems one or two died. Others work, as far as I know (gave to friends). Considering that the phones I have fail before the PSU, in my opinion not a bad statistic.

Because of the rule took to buy the Samsung brand chargers. Moreover, with the advent of Samsung FastCharge had slightly updated.

And the Chinese, I have live an average of six months to a year. Their packs take to power the separate devices (Arduino, etc.), so do not mind it if he would kill the PSU during the experiments.
June 10th 19 at 16:59
samsung and asus are firing office

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