Pros: The felt quality is top, as fast recharge my phone with its own charger.
Cons: The charger is not provided, so use that of his phone, charging the battery is rather long (about 7 am with my Nexus charger 5: 1.2A), triggering by shaking for me is not the Good choice.
This battery has done its job for almost 3 months I'm about 20 cycles, then one day, without warning, she did not work anymore and became ... a clipboard.
After an email to Amazon, waste and ultra fast refund. Amazon thank you.
EDIT:
Following this opinion, without my contact customer service Anker, and then I had already been reimbursed by Amazon, Anker wished still offer me a new battery as a commercial gesture.
I would say that, despite the failure of which I was victim, customer service is top, I find myself with free battery, so I can only recommend the brand Anker!
I spend 2 to 4 stars.