pre-requisite and steps

your phone battery level should be around 50% before doing these experiment (the phone can reduce the mA as they hit 80% above to extend battery life, this has been observed in all my three phones)
1. an app that can record mA properly. (i recommend battery monitor widget by 3c on play store) i have pro version but free one should do the job.

2. open the app-setting-history- and check save battery history. change the history update rate to 10 seconds for this experiment.

then go back to app's setting-history marker- and tick auto mark on charge and unplug

3. go back to the app's main screen and click history (you can now see the mA reading)

3. use the same power point (preferably a stable one, i charged mine from an AVR power point so the voltage is relatively stable)

4. now test the chargers that you have with you, can try different combo.

5. it is important to keep the screen off while doing the experiment to ensure that we are not messing with the reading from our screen usage.

6. keep the screen of for say four minutes and then turn on the screen and check the reading, if most of the reading is say 800 with the range of 780-800, i'll say this as stable.

if it fluctuates a lot, say variance of 50-100 mA, not so stable.