In this article, we will discuss the power support provided by different USB chargers, cables, and devices.

Power Delivery (PD) is a charging standard that allows devices to charge rapidly through a USB connection. It facilitates communication between two devices to negotiate power settings, enabling them to determine the maximum amount of power that can be drawn from the charger. Power Delivery starts at 5V and can be configured up to 20V. It can handle up to 60W using a standard USB-C cable and up to 100W using a designated EMCA cable.

The following table outlines Power Rules for both USB PD 2.0 and USB PD 3.0

Supply SourcesVoltageVoltageVoltageVoltage
15 W supply5 V9 V  
27 W supply5 V9 V15 V 
45 W supply5 V9 V15 V20 V


The article solely compared the power delivery of the device, without measuring the charging time for the device or the battery.

We were using the following USB Power Meter Tester


We used the following chargers and batteries in our testing.

RAVPower 64 W2 X USB C 2 X USB-A
Anker 711 Charger (Nano II 30W)1 X USB C
Apple 20 W1 X USB-C 
INIU Power Bank BI-B5USB-C (20 W) 2XUSB-B (22.5W) 
Anker 313 Wireless Charger1 X USB-A 
Anker 313 Wireless Charger (Pad) – Anker Canada1 X USB -A 
Anker 40W Car Adapter2 USB C 
Fast 3.0 HNT-PD20021 x USB C 1 X USB A 


Charging iPad Pro, 12.9-inch (5th generation)

NoDeviceInput PortChargerCharger OutputVoltageAmperageWattage
1iPad Pro, 12.9-inch (5th generation)USB-CRavPower-65WUSB-C14.9 V2.32 A35.3 W
2iPad Pro, 12.9-inch (5th generation)USB-CRavPower-65WUSB-A0.0 V0.0 A0.0 W
3iPad Pro, 12.9-inch (5th generation)USB-CApple 20 WUSB-C8.9 V2.15 A19.2 W
4iPad Pro, 12.9-inch (5th generation)USB-CINU BatteryUSB-C9.15 V2.11 A19.3 W
5iPad Pro, 12.9-inch (5th generation)USB-CAnker Charger 30 WUSB-C14.9 V1.95A29.1
6iPad Pro, 12.9-inch (5th generation)USB-CFast 3.0 HNT-PD2002USB-C0.0 A0.0 A0.0 W

Apple has included a 20 W charger with the Ipad Pro 12.9 Inch. However, it has been observed that only 9 V PF profiles are utilized by this charger which provides a maximum of 19.2 W (No 3).

On the other hand, if you use the RavPower 65 W charger (No5), PD switches to a 15 V profile and starts charging the Ipad with 35.3 W. This is around 57% more than the original Apple 20 W charger that comes with the device.

Another excellent performer is the Anker 30 W (No 5) which also switches to a 15 V PD profile and supplies a full 29.1 W to the Ipad.

It is important to note that the Ipad cannot be charged with a USB-A to USB-C cable at all (No2).


iPhone 14 PRO MAX

NoDeviceDevice InputChargerCharger OutputVoltageAmperageWattage
7iPhone 14 PRO MAXLightingRavPower-65WUSB-C8.78 V2.96 A26 W
8iPhone 14 PRO MAXLightingRavPower-65WUSB-A5.08 V2.00 A10.2 W
9iPhone 14 PRO MAXWireless PADRavPower-65WUSB-A5.06 V1.42 A7.27 W
10iPhone 14 PRO MAXAnker Magnetic PADRavPower-65WUSB-C8.97 V1.09 A9.74 W
11iPhone 14 PRO MAXLightingINU BatteryUSB-C9.16 V2.16 A19.8 W
12iPhone 14 PRO MAXLightingOEM Subaru USB PortUSB-A5.06 V0.91 A4.63 W
13iPhone 14 PRO MAXLightingAnker 40W Car AdapterUSB-C8.90 V2.11 A18.8 W
14iPhone 14 PRO MAXLightingAnker 30 WUSB-C8.9 V2.96 A26.4 W
15iPhone 14 PRO MAXLightingFast 3.0 HNT-PD2002USB-C8.9 V1.97 A17.6 V

The iPhone 14 Pro Max doesn’t come with a charger. However, we’ve noted that the RavPower-65W (No7) and Anker 30W (No14) chargers can provide around 26W of power to the iPhone. This seems to be the maximum charge wattage for the device. It’s worth noting that the charging supply from the OEM Subaru USB Port (No12) is quite weak, with a maximum charge rate of only 4.63W. If you’re looking for a faster charging solution, we recommend the Anker 40W Car Adapter (No13), which can provide a charging rate of 26.4W – almost six times higher than the OEM Subaru USB Port.

iPhone 13 Pro Max

NoDeviceInputChargerCharger OutputVoltageAmperageWats
16iPhone 13 PRO MAXLightingRavPower-65WUSB-C8.82 V 2.32 A20.4 W
17iPhone 13 PRO MAXLightingRavPower-65WUSB-A5.07 V2.03 A10.3 W

iPhone 13 Pro Max is using 20 W with a USB-C to USB-C Cable and 10 W with a USB-A to USB-C.

iPhone 12

NoDeviceDevice InputDeviceCharger OutputVoltageAmperageWats
18iPhone 12LightingRavPower-65WUSB-C8.81 V2.09 A18.4 W
19iPhone 12LightingRavPower-65WUSB-A5.11 V2.25 A11.5 W
20iPhone 12LightingINU BatteryUSB-C9.12 V1.74 A15.8 W

iPhone 12 has similar charging patterns as iPhone 13. Max charge wattage is around 18.4 W (No 18)

Canon R5 Battery

NoDeviceDevice InputDeviceCharger OutputVoltageAmperageWats
21Canon R5  battery LP-E6NHLightingRavPower-65WUSB-C5.06 V1.38 A6.96 W

New Canon cameras come with a USB-C port where you can charge the internal battery without removing it from the body. Unfortunately, the charge rate is very low, around 7 W.

External INU Battery

NoDeviceDevice InputChargerCharger OutputVoltsAmperageWats
22INU BatteryUSB-CRavPower-65WUSB-C8.912.0117.9 W

This battery is a nice surprise. The battery was able to charge the iPad Pro, 12.9-inch (5th gen) No4 with 19.3 W, and charge the iPhone 14 PRO MAX (No 11) with 19.8 W using a USB-C port.
The charge wattage for the battery was around 18 W.



If you own an iPad Pro, 12.9-inch (5th generation), you would need a charger that can supply at least 36 W of power. Based on our research, the RAVPower 64 W 65 W is the only charger that is capable of supplying 36 W for this device.

For iPhone 14 PRO MAX, you would need a charger that can supply at least 26 W of power. We recommend the Anker 711 Charger (Nano II 30W) for this device. However, if you have multiple devices that need charging, we would suggest the RAVPower 64 W charger.

For any other iPhone, a 20 W charger with a USB-C to Lighting cable would be sufficient.

If you need to charge your device in the car, we would suggest using the Anker 40W Car Adapter, which is six times faster than the Subaru OEM built-in USB-A charger.

For a battery bank, we recommend the INIU Power Bank BI-B5, which has a constant 20 W output. Please ensure that you use a USB-C port for input and output on the battery.

To take full advantage of the fast charging function of your new USB-C devices, you need to use a USB-C PD (Power Delivery) cable that has the Power Delivery protocol. It is crucial to use USB-C to USB-C and USB-C to Lightning cables for optimal performance and try to avoid any USB-A connector on the cable.

By Dan Djurasovic

Dan is an Azure Technical Advisor, with over a dozen years of IT experience, specializing in Microsoft Office 365, Exchange Server Azure IaaS and Active Directory..

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