Ok, so you have both ASUS 18W charger and 30W charger, yes?
So with our 18W charger you measure 2960 amp with what? Accubattery, Ampere app?
To start off, none of these apps are reliable as they have to consider both used power and incoming power and it's constantly changing without the app really having any idéa of what the real current power consumption is.
If you want to make an as fair comparison between the bundled ASUS cable and you boAt charging cable as possible, then I recommend Accubattery (not that Accubattery is accurate but it's the most accurate of all the apps that I've tried). First, your phone needs to be below 50% battery. Start accubattery, plug in with first cable, make sure it says 0m under Screen off in the Charged category. Turn of the screen for 5 minutes and note how many mAh it charged in Screen off. Change to the second cable and make sure it says 0m under Screen off and make the same test again. Lets say it says 190mAh in 5m with the first cable and 215mAh in 5m with the second cable. That's to be considered as within the error margin as Accubattery is not a very accurate measuring tool.