Power bank is charging but it is kept for 6-7 months without use that's why phone is charging through this powe bank from 0 to 20-30% only....also it's switch on/off button gets automatically off....to charge the phone we need to switch on the button after every 5 minutes...
thats why selling for less...need little repair ..This power bank costed me 3000 rupees 1 year back...