Như tiêu đề mình cần mua pin sạc dự phòng của Anker mà sao thấy nhiều dòng quá. Gia tiền cũng khác nhau. ai hiểu rõ tư vấn giúp minh ưu điểm của từng dòng. thanks!
http://www.amazon.com/Anker-13000mAh-Capacity-Portable-Technology/dp/B00BQ5KHJW
http://www.amazon.com/Compact-20000mAh-Portable-Anker-PowerCore/dp/B00X5RV14Y/ref=pd_sim_107_1?ie=UTF8&refRID=07XCRQVSEG2FMHWTNSST
http://www.amazon.com/Anker-PowerCore-10400-Portable-Charger/dp/B00Z9QVE4Q/ref=sr_1_9?s=electronics&ie=UTF8&qid=1440346213&sr=1-9&keywords=anker
http://www.amazon.com/Anker-13000mAh-Capacity-Portable-Technology/dp/B00BQ5KHJW
http://www.amazon.com/Compact-20000mAh-Portable-Anker-PowerCore/dp/B00X5RV14Y/ref=pd_sim_107_1?ie=UTF8&refRID=07XCRQVSEG2FMHWTNSST
http://www.amazon.com/Anker-PowerCore-10400-Portable-Charger/dp/B00Z9QVE4Q/ref=sr_1_9?s=electronics&ie=UTF8&qid=1440346213&sr=1-9&keywords=anker