What makes that better than this Anker MKII at half the price?
http://www.amazon.co.uk/Anker-Exter...ciency/dp/B00DMXMA78/ref=pd_rhf_ee_p_t_2_2ZJ8
£6 more gets you the 12000mAh version, looks good

Tempted to buy it but know will probably use like once a year lol