Is this phone charger 15w or 24w?

[Solid State Soul ( SSS )]

This phone charge in the picture below shows 3A 15w, but also 9v and 12v at 24w, am confused, aren't phone charge at 5v, then what is the 9v and 12v for?

i have a 15w phone and don't want to buy faster charging for battery health.

 

[jon_joy_1999]

This device will charge compatible devices faster by boosting the voltage beyond the USB standard 5 volts. If you're looking to save your battery's lifespan you should focus more on how high you charge your battery rather than how fast you charge your battery.

 

[1freedude]

It's like an early version of Power Delivery, PD. The charger communicates with the device to make available the highest energy the device can handle.

I do what you want to do, but through an app called AccA. It requires root, but there might be apps that do the same without root. I limit current to 750mA and state of charge to 80%. I started my day 10 hours ago at 80%, and I'm at 56 now. Occasionally i will take excursions into the low 90s if I think I'll be away from power for awhile.

 

[Shihab]

Chargers (and hardware) can support various voltages/current combinations. Any USB-PD compliant hardware can pick the best available one it supports. The point is that one charger can support a wide array of phones or even notebooks without being limited by the lowest common denominator.
If the device doesn't support PD, it will fall back to 5V and 0.1~3A mode.

 

[Lei]

i have a 15w phone and don't want to buy faster charging for battery health.

Battery dies 5 times faster from 80% to 100% than it does from 0 to 80%

It's not about how many times or how fast you charge, it's about how many minutes you charge.
As you probably noticed, charging gets a lot slower when you're near filling up the battery.

So if you charge 5 times upto 80% (total 400%) you exhaust your battery similar to charging once to 100%.

Lithium is like your stomach, fill it when you're hungry, but don't eat upto your neck, stop eating when your belly slows down.

 

[AusWolf]

15 W if your device charges at 5 V, but 24 W if it takes 9 V or 12 V with "fast charging" (it can be enabled or disabled in your phone's settings if it supports it).

 

[Lei]

15 W if your device charges at 5 V, but 24 W if it takes 9 V or 12 V with "fast charging" (it can be enabled or disabled in your phone's settings if it supports it).

And if the charger has a higher wattage than the phone, doesn't mean it definitely charges at the max wattage phone can support.

A 24 charger may not even quick charge a 15w phone.
For example a 66w charger won't charge a 18w phone when the phone is 9v2a/5v3/12v1.5a and the charger is 5v2a/10v4a/11v6a (max 66w)
It won't even charge the phone at 15w

So you can have a 24w charger that slow charges your 15w phone.

I have a 15w phone and don't want to buy faster charging for battery health.

If your phone is 15w, it will charge max at 15w, regardless of you using a 120w charger. It may even slow charge. You must check what voltage and ampere multiplied to give 15 specifically of your phone.

If your phone is 5v3a then a million watt charger will charge it slower than 15w unless charger also has 5v3a output.

 

[AusWolf]

And if the charger has a higher wattage than the phone, doesn't mean it definitely charges at the max wattage phone can support.

A 24 charger may not even quick charge a 15w phone.
For example a 66w charger won't charge a 18w phone when the phone is 9v2a/5v3/12v1.5a and the charger is 5v2a/10v4a/11v6a (max 66w)
It won't even charge the phone at 15w

So you can have a 24w charger that slow charges your 15w phone.


If your phone is 15w, it will charge max at 15w, regardless of you using a 120w charger. It may even slow charge. You must check what voltage and ampere multiplied to give 15 specifically of your phone.

If your phone is 5v3a then a million watt charger will charge it slower than 15w unless charger also has 5v3a output.

Simply put, as long as your voltages match (5 V charger + 5 V phone or 9 V charger + 9 V phone), your phone will draw as many Amps as it can take and the charger can supply. Multiply the two (Volts and Amps) and you've got your Watts. Easy.