I had purchased this from Flipkart.com for around Rs 1400/-($23), which is I guess reasonable price for a power bank of such high capacity, the P-1040 model costs Rs300 extra but the only major difference is the design which is more sleeker but other than that everything else is almost the same
- High Power Ultra Bright LED Torch
- Digital Display
- 10400 mAh Capacity
- Samsung SDI Lithium-ion Cells
- Charging Time: 600 mAh Per Hour
- Input: 5V/1A
- Output: 5V 1A and 5V 2.1A
To test the backup and charge of this power bank I had charged it till 100%(see attachments), and depleted the battery in my Nexus 4 completely, I then charged my phone using the Power bank in the 2.1A port till 100%.
The power bank registered a charge drop from 100% to just 92% while the 2100mAh battery in my Nexus4 was completely charged. Which means this would charge my Nexus 4 at least 4-5 times!
Value for money is there in this product and the dual outputs are great for even charging 2 devices at the same time, many would rather opt for the Xiaomi Mi Power Bank, but comparatively its almost the same and this has a few extra goodies.
I hope this review was helpful, for international buyers you may find this product on eBay or Amazon, and for Indian buyers its readily available on Flipkart, Snapdeal, Amazon.in and eBay.in