dickus @ 12/02/2016, 18:49
The link above is my review.
The author, and some others who use USB testers to measure the capacity of batteries in this spirit. The USB tester can measure directly not the battery capacity itself, but only the voltage and current passing through it. He has no voltage converters. Accordingly, at its output will be the voltage that came to its input from the power supply: 5 volts (minus losses on the shunt) -
it is important to remember. The voltage conversion required to charge the battery is performed by the power / charge controller built into the phone -
it is also important to remember. Thus, at the same power, the current and voltage passed through the USB tester and supplied to the battery will be
always be different. What some owners of USB-testers do not know / do not remember, looking only at tsiferki mAh, not attaching importance to tsiferkam
stressesoutput by usb tester.
To find out about the correct (efficiency of the charge controller, charge / discharge efficiency depending on the internal resistance of the battery, low voltage cutoff voltage and other subtleties, due to the removal of the brain measuring and little influence for this style of measurement), it is enough to apply a simple calculation.
• Multiply the voltage and capacitance displayed by the USB meter to get the energy value in watts.
• Divide the received energy value by the nominal value of the battery voltage.
On the example of a sabzh battery review, it will look like this:
4.9v * 1.32Ah = 6.468Wh
6.468Wh / 3.7v = 1.75Ah = 1750mAh
If you do not take into account the long text written in brackets above, the measurement results of the author are consistent with the inscriptions on the sabzh battery sticker.
shl
Auto RU. If there is a desire, signal in lichku. There are considerations regarding some of the highlights of your reviews, in your best interest.