With this small portable rechargeable battery pack, users would be able to use their notebooks 3-4 hours more. Extra USB port is used to charge cell phones,mp3/4,ipods,iphones, pda and other 5V devices as well. 

Battery type: lithium polymer battery

Capacity: 20,000mAh/74W

Rated input:   14 to 16V DC

Rated output: 12, 16, and 19V DC 
                         USB out: 5V/700mAh

Cycle life:after more than 500 circles, the power can still remain 80%.

Intellectual protection PCBA: protection for overcharge, over-discharge, overload, and short circuit protection.

* Welcome to contact us when you have questions about this product