We finally got the charger from Amazon. It was announced to be released in Oct, 2010, but it ran out of stock for unknown reason. That’s why we got this product 3 months later.

It is the first product fits Qi standards. Qi is the common standards regulated by WPC. It is created by a professor in Hong Kong, and the technologies of these standards come from American Fulton Innovation | eCoupled. For sure, the patent is owned by this company. Fulton is the subsidiary of Amway group. To solve the charging problem of one UV rays tube in water filter, it initiated the development of wireless charging.

Back to the topic, to check the official website of this charger: http://www.energizer.com/inductive/.

This product is sold in 2 parts. One is multi-functional charging pad. This pad is able to supply power to different devices. The other is charging coat depending on the mobile phones you want to charge. The coat varies with mobile phones. Now, the available coats are for iPhone 3G and Blackberry 8900.

What we ordered is one charging pad and one charging coat of iPhone 3G.

Simple Package, including one pad and one transformer

Specification of transformer is outputting 9V/ 2.3A. Input voltage is general-purpose 100V-240V.

There are just few items in it, including one charging coat and one user guide. This charging coat is exactly the same as gear4’s.

The website of manufacturer is ConvenientPower HK Limited (http://www.convenientpower.com/). Generally speaking, brand companies don’t produce goods by themselves but by OEM/ODM. They usually just put their brands on the product.

The biggest difference is the Qi mark at the back of product.


I taped the test process and uploaded it to youtube.

Next is to test electronic characters.

After charging pad is connected to power supply, there is standby current dissipation. It is because of the detection of charging coat.

I cut the power cord to measure input current. There is about 50mA dissipated current when there is no charging activity. From the view of power, it is 0.05A*9V=0.45W. This means that once it is connected to power, there is 0.45W dissipation.
I remember that WPC announced the standby current dissipation is under 1mW (0.001W). As you can see, there is a quite huge difference.

While it is charging, the current dissipation gets higher.

Working voltage of charging iPhone is 9.07V, and current dissipation is 0.38A. Since iPhone charging power is not constant, there is no way to calculate frequency precisely.
Key indicator of wireless charging product is transformation frequency, the calculation is shown below.

1. Power input Voltage 9.06V Current 0.43A Power= Voltage*Current= 9.06*0.43= 3.8958W
2. Receiving output Load 10 Ohm Current 0.47A Power= Current^2/ Impedance= 0.47*0.47/10= 2.209W
3. Frequency %= (Output/ Input) % = 56.7%

WPC claimed that transformation frequency is above 70%; however, the frequency of their first product is even less than 60%. Is it really a reliable standard?

Thanks for your patience

› See More: [Open box] Energizer Inductive Charging Pad and iPhone 3G/GS Sleeve