We only provide 1000mah/1500mah,and our model have on/off switch. Can sure after a year,the power bank have battery inside,can charge mobile phone. Others don't have this button,maybe no battery by Self-consuming,after several days.
Batteries: Polymer lithium aluminum shell batteries.
Powerbank output:5V 500mA
Battery grade: A grade
Powerbank material: Fireproof ABS+PC