I bought this Syska Power Bank 10000 mAh from an online store, and after using of 4 months, it stops working. The worst thing is after charging the power bank fully, when I try to charge my 2600 mAh phone usingthe power bank, it shows that it’s not fully charged, just charged my phone 30-40% and then the battery dies. The Syska Power Bank is too bulky to carry. If you want to waste your money you can buy this cheap quality of power bank. One more disadvantage of this power bank is that it heats up quickly and then stops working.WORST Power Bank EVER.