As a follow-up: I decided to pull the trigger on this and i am very pleased with the results.
From the time oforder to the parcel's arrival was about 5 days. The battery was shipped DHL from Berlin Germany. The packaging was just as you see in the photos, with everything brand new included the charger worth £35, the power connector lead, and the rack for the battery.
I took a peek inside the rear which was very professionally assembled, very tidy construction. Nothing heath-robinson there.
The cells used are Samsung Li-Ion battery ICR18650-26C 3,7V, Purples. Which i think are 2600mAh, just like the ones shown here on Amazon at £6 a pop.
http://www.amazon.co.uk/Samsung-Li-Ion-battery-ICR18650-26C-2600mAh/dp/B005D77MH4
This mean if they ever produce batteries with the lates higher capacity cells, the same battery form factor could be used to produce even higher current... At this price i am very pleased and i hope they are around long into the future for any other upgrades.