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Use the Car Friendly GearMo USB Type-C 27W PD Adapter to Rapidly Charge Your Mobiles

Portable power sources such as car chargers are essential to gadget heavy users to keep their phones or tablets charged while on the move. Joining other USB Power Delivery based car chargers out there is the USB Type-C 27W PD Adapter by GearMo, a US based company specializing in USB products. 

The GearMo USB Type-C 27W PD Adapter supports USB Power Delivery 2.0 technology over a USB Type-C connector which is similar to products like Belkin's USB-C Car Charger + Cable, Ventev Dashport pd1300 Car Charger and Energear 27W USB-C Car Charger, which can also provide up to 27 watts output power. The GearMo USB Type-C 27W PD Adapter works with your 12-16V car's cigarette/DC charge port to quickly charge your USB Type-C based mobile, tablet, or laptops. 

Interestingly, the GearMo USB C Car Chargers website claims the charger is also able to support Qualcomm Quick Charge 2.0 and 3.0 as well as Huawei's and Samsung's proprietary fast charging technologies. We'll find out more on this when testing the charger for various USB-C compatibility.

Like most accessory packaging, the GearMo USB Type-C 27W PD Adapter has a clean and simple design for its box.  

The back of the box clearly states the following power profiles: 11.5 watts (5 volts @ 2.3 amps), 20.7 watts (9 volts @ 2.3 amps), and 27.6 watts (12 volts @ 2.3 amps) that the charger supports for charging. Oddly, these profiles don't quite match those listed in the the GearMo USB C Car Chargers website  which can be confusing.

Rather than including a USB Type-C cable in the box just like Belkin's USB-C Car Charger + Cable, Ventev Dashport pd1300 Car Charger and  Energear 27W USB-C Car Charger, GearMo chose to supply only the charger on its own. Just make sure to bring your own cable to use this charger.

The GearMo USB Type-C 27W PD Adapter only comes with a single USB Type-C port but has enough power to support all phone and tablet models. If you need two USB ports to charge two devices at the same time, GearMo also offers the 75W USB C Power Delivery (PD) Car Charger (see review here).

The GearMo USB Type-C 27W PD Adapter looks typical of many other car chargers out there. The compact form factor of the charger should fit well in your car's DC charge port no matter where the port is located.

Using the USB Power Test App from Granite River Labs with the Granite River Labs USB Power Delivery Compliance C2 Tester, we generate the following test results for the GearMo USB Type-C 27W PD Adapter.

The USB Power Test App first negotiates a power contract for every PDO supported by the GearMo charger, and increases the load gradually to find the threshold where over current protection (OCP) kicks in and voltage and current start to drop for safety reasons.

The USB Power Test App reports out all the PDO's supported by the GearMo charger and their OCP thresholds. OCP thresholds for the charger are set at about 75-90% above the maximum current levels for the fixed PDO's.

PDO	OCP (A)
PDO#1 Fixed: 5V 2.39A	4.18
PDO#2 Fixed: 9V 2.39A	4.55
PDO#3 Fixed: 12V 2.31A	4.25

The USB Power Test App from Granite River Labs also produces an I-V curve which graphically shows the relationship between voltage and current for each PDO. Unfortunately there is no stable trace to clearly see any voltage and current behavior at OCP trigger for each PDO.