1. Capacity: 6800mah
2. Weight: 200g
3. input: DC 5V-1000mA
4. Output: 5.3V-2000ma (max)
5. Dimension: 93.6x13.6 x1mm
6. Material: Non-flammable, Alloy shell
Usually there is internal resistance in all mobile. and power bank will lost power when you charge mobile because this internal resistance. we called it is Conversion Rate
so the power bank charge your mobile, it is not like 6800mah / 2000mah ( if your mobile battery )= 2.8 FULL charging.
usually power bank 6800mah can charge iphone 5 4 4S for 2.5 times full power around.
Charge SamSung Galaxy S3 battery ( 2100mah ) to 2.6 times full power around.
Charge SAMSUNG Galaxy S4 battery ( 2600mah ) to 2.1 times full power around.
please charge your power bank for 6 hours first and than to charge your mobile. it will works good
6800mah power bank is mean: there is 6800mah lithium battery in this power bank. but the output power is different for every mobile. because mobile internal resistance is different.