How do you tell wattage/power of the charger?

[Snareman]

The current charger options are 25 and 45w. I also have the previous fast charger. I don't remember enough from college physics to figure this out. Looking at the labels on them, how do you get 25 and 45w and what was the power of the previous fast charger?

 

[strikeIII]

Volts X Amps = Watts

 

[Snareman]

Volts X Amps = Watts

Ok, so the old fast charger is 10 or 15W while the new ones are apparently 25 and 45

 

[strikeIII]

Ok, so the old fast charger is 10 or 15W while the new ones are apparently 25 and 45

Yup. You can use the new ones with older devices too just in case you were not sure.

 

[Snareman]

I'm doing my own test comparing the 3 with my S20+. The 25w actually came out the fastest and I ran the 45w test twice.

 

[j_hansen]

I'm doing my own test comparing the 3 with my S20+. The 25w actually came out the fastest and I ran the 45w test twice.

If you don't use the correct cable it will only charge at 15W, use the one that says 5A on the plug in the 45W charger