+1 for this brand, I bought a couple of 5000mAh off a friend on here and they have been great. It did once disharge them to the point of cutoff (set to 6.4v on my esc) and they recharged with 5300.
Now they've brought out a shorty pack, this will be my next purchase:
http://www.giantshark.co.uk/product/...o-battery-pack