My dell power companion can't charge venue 11 pro 7140!!

Hello.

I bought Dell Power Companion (12,000 mAh)-PW7015M last Sunday.

I try to use this product in order to charge my venue 11 pro 7140 tablet.
(I charged my dell power companion for 3 hours. and I used it.) But, this extra battery didn't charge my tablet.
When I was connected venue 7140 with dell power companion. I could see following message.

[Alert! A 3W AC power adapter has been detcted. which is less than the recommend XXX AC adapter
 originally shipped....]

This extra battery only able to charge my cell phone. It doesn't charge venue 11 pro 7140.

But dell product page said,

[ overview -> Compatibility -> This product is compatible with the following systems -> Venue 11 Pro (7140) ]
*I took a photo this product page.

What does this mean? How can I charge venue 11 pro tablet with dell power companion? 
Venue 11 pro 7140 tablet can charge with micro USB cable.
(Is there any charge method? There was no explanation about another charge method in manual.)
But connect this product to venue 11 pro tablet, It charged very very low voltage. It means battery is going to discharge.

I want to ask this problem, and If dell support needs screenshot, I will send jpg file.

(I send e-mail this contects to dell support. But they didn't respond. So I wrote this page.)