<span style="font-family: Comic Sans MS;"><span style="font-size: larger;">Patternflyer ... no point emailing them to ask, its a typical HK/China business, low prospects of a reply unlike US businesses. I got 8 packs of their 5S 20C 4,900 mAh packs and they are working fine but I for one would not push them to the max of 20C. So far no issues at all. You can read the reviews from their website and its safe to say about 99% are very happy with the batts.</span></span>