USB cable Features:

USB Input: 5V 2A-4A
DC Output: 8V-8.4V
Conversion efficiency: 92%  (DC-DC Efficient conversion rate)
USB plug Specifications: USB2.0
USB Cable length: About 120cm (Can be customized)

Precaution:
1. In order to optimize your camera's work, use high-quality mobile power, mobile power needs to output 5 volts 2A / 4A current. When the power or current is insufficient, you can't shoot. Please choose at least better current.
2. The mobile power has an automatic sleep mode and is turned off.
3. Do not use computer USB, because the computer USB 2.0 output voltage is mostly 5v, but the current is less than 500mA current.
4. Some mobile phone/tablet USB charger and resistance recognizer, do not know the camera, the current can not meet the requirements, so it is not recommended.
5. Use the camera for a long time to set the camera standby time to the maximum standby time.
 
Descriptions:
1.DC drive cable can't only play the role of power adapter,while also serving to effectively suppress harmonic current noise.
2.High-quality chips,DC-DC converter,high conversion efficiency.
3.Good stability,can output high current,quiescent current is small.
4.DC drive cable connected power bank supply for digital cameras,power bank capacity:8000-30000mAh,equal to the new battery in the camera's power many times.When you turn on the flash to take pictures or video,to provide uninterrupted power supply.
5.Using a wide range,suitable for all 7.2V-8.4V digital camera and video camera, support part 9V digital products.
drive8v tips
Some cameras require that the lid of the camera's battery compartment must be closed.After closing the lid the camera can be turned on. For details, see the Manual illustration. 

DC drive cable It works wonderfully: For Canon EOS Rebel T2i / Canon T2i / Rebel T2i For Canon EOS Rebel T3i / Canon T3i / Rebel T3i For Canon EOS Rebel T4i / Canon T4i / Rebel T4i For Canon EOS Rebel T5i / Canon T5i / Rebel T5i For Canon EOS 550D / Canon 550 D For Canon EOS 600D / Canon 600 D For Canon EOS 650D / Canon 650 D For Canon EOS 700D / Canon 700D For Canon EOS Kiss X4 / Canon X4 For Canon EOS Kiss X5 / Canon X5 For Canon EOS Kiss X6 / Canon X6 And more models.
LP-E8 DR-E8 直流耦合器+usb 电缆 适合 5V 2A 移动电源 适用于佳能 550D 650D 700D - 第 1 张/共 4 张
Package: 1 x USB drive cable ACK-E8 1 x DC Coupler DR-E8 1 x Manual

If you use "DC drive cable" and Power Bank: We notice a buyer feedback that, use our prodcuts can start his camera, but when shooting, the camera shut down. we'd like to explain here, we provide the the DC coupler and the USB cable adpater only. For this customer's case, proves our products can successfully connect the power, and the cable adapter successfully improves the voltage. But when shooting, the camera shut down, this the power source's problem.This situation,Please use a power source at least DC 5V 2.4A, DC 3A is better. To solve this problem, you just need to change a power source. Choose a quality power bank, there are too many power banks on the market. There are some mobile power parameters that mark the fake output, they do not allow to draw higher current, when you shoot, it's bond to draws higher power than you start the camera, then the power bank stop supplying the power, then the camera shut down. We recommend: such as the Xiaomi 20000mAh version (not Xiaomi 2C ), which allows maximum DC output DC 5.1V 3.6A, or xiaomi 10000mah Pro, Zmi 10 20000mah, CHOETECH 10400mAh (QC3.0) and other well-known and reliable brand. Recommended USB power port 5V-5.5V current 2.4A and above, 3A is better. Tips: General digital battery printed above parameters 7.2V / 7.4V labeled battery, it is the camera's minimum operating voltage, these batteries need to use 8.4V charger, full of power, charger 8.4V said no-load voltage, operating voltage and no-load voltage are two different concepts. External power used in the camera, You need to have enough power to supply, the camera is a load,the operating voltage is far lower than the no-load voltage.Therefore, the Camera adapter's no-load voltage is usually between 8V-9V (Note: the multimeter test is no-load voltage).

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