How do I know whether effective your chargers

The phone for two hours charging, but to no avail - some 30%. We used to blame the battery dying prematurely, although often it is not in it. Guest Post by Andrei Yakovlev tell you how to find out whether or not your battery charger serves its purpose.

Recently Layfhaker told how to find problems in charging your gadgets via USB-tester. We present to your attention another way, which does not need any additional equipment.

Modern smart phones and telephones themselves provide its charging by controlling the charging voltage, charging current, battery voltage and its temperature. All these data phone knows and can show to its owner in the service mode. It is also called engineering, factory or test.

Attention! If you are not sure in their actions, please do not enter your phone in service mode. Rumor has it that someone somehow managed to mess up while your device.

And for those who are confident and not afraid, continue.

For the purity of the experiment translate your phone in the "Jets" mode (to its consumption by charging not swim, depending on the strength of the GSM-signal, Wi-Fi and Bluetooth). Turning off the GPS-receiver, disable the auto-adjust screen brightness.

Phone to the service mode. For my Lenovo is a combination #### 1111 #, typed in dialer; for Samsung phone fits the combination * # 0228 #. I think you can easily find the combination for your machine on the Internet. By the way, I ran into a combination of type * 777 #, to which many complained Perform this USSD-request, smartphone owners have received from the mobile operator some wildly expensive set unnecessary options. Perhaps it was the layout of the site with the service codes do not know. In any case, the included "Jets" mode will protect you from this. Also, keep in mind that the service codes for phones usually begin with # * (yes, the lattice must be present) and do not require pressing the call button.

So, we went into the service mode. The structure of the service menu is unique to each manufacturer's vehicles. In my Lenovo, I selected the Item Test → BatteryChargingActivity, the Samsung only there were some parameters and I flipped through a couple of times down until the desired values.

To check zaryadok we will control the current. It may be designated as Charging Current, measured in mA (milliamps) at non-connected charge is set to "zero".

We collect interest chargers. Better if there will be more and they will have removable cables, then the quality of the analysis will be better.

I took a few of chargers with USB output and, therefore, more than one cable type USB → microUSB. Connecting them in various combinations to your machine, for each combination to determine the minimum and maximum charging current (it floats a little time) and recorded them in the table.

The charging current in various combinations chargings and cables in milliamps (minimum and maximum)

»
At the same time count, the percentage float current when charging. Record the results in the second table.

Current change in the process of charging a percentage

»

According to measurement results, the following conclusions:

• The displayed current is not measured accurately, and with some steps. Accordingly, you should not pay attention to the exact values ​​of the measured current.
• My phone while charging consumes about 1000 mA (seen in № cables 1 and 2 in combination with recharges № 1, 3 and 4 - the current values ​​similar to each other and the maximum of all the measurements). This is evidenced by the maximum current, written in "native" charge - 1000 mA.
• № cables 1 and 2 are equally well transmitting charging voltage.
• № cable 3 has a high resistance, so much smaller charge current position. Use it to charge can only be in a desperate situation. When included GSM module, Wi-Fi, Bluetooth, he is unlikely to even maintain the battery charge level.
• Charging № 2 (stated as odnoampernaya) gives a negative current, i.e. the current in the other direction. She instead charge discharges the gadget. By the way, the Samsung phone has shown a negative current, but only zero.
• Charging № 4 - from iPad, reported as giving 2400 mA, has the highest capacity (seen in "high-resistivity" cable № 3). Charging № 3 (reported as trohampernaya) - double, both equally well connector charge telephone, but when connected thereto a stronger load (e.g., tablet) give more current to the second port. If the rough estimate value for the maximum currents at its connectors obtained in bad cable (280 mA and 410), the first connector is able to deliver 1200 mA, and the second - 1800 mA. This is indirectly supported by the maximum drawdown current (second table): the stronger the charge, the lower drawdown.
• Charging № 5 (vehicle, the cigarette lighter) gives insufficient for the charge current (compared with recharges № 1, 3 and 4). Indeed, when traveling south on the smartphone in the navigator mode for 16 hours road she could only maintain the percentage charge on one value.

To little to rehabilitate the cable number 3, for example, that when it operates on a less demanding workload and it prevents smaller: when charging your Samsung phone instead of the required 453 mA, 354 mA, it conveys that it is already possible and suffer.

Here's what happened at the end of my zaryadok test. You results will be slightly different, but the general sense, I think you get the: find the maximum current of all combinations of cables and determine the successful charge and separately analyze the combination of giving less current.

Good luck in your measurements!