. The Versa Battery Lithium-Polymer Battery Pack has a 190 Watt-hour Rechargeable Lithium-Polymer Battery Pack. It has a modified Magsafe Power Cable to Power 15' & 17' Mac Pro Provides 6 Hours of Additional Laptop Power with tethered Hi-Res Camera and Maximum Processor Load. Contains additional 12V and USB Power Ports to Run/Charge Accessories. With an LED Power Indication and an On/Off Switch. Product Description 190 Watt-Hour Advanced Lithium-Polymer Battery Pack with Modified Magsafe Power Cable to Power Apple MacBook Pro 15' and 17' Rechargeable Super High-Capacity Advanced Battery Technology. 6-12 Hours of Additional Battery Life Depending on Processor Load. 3 Power Outputs: 19V port: 5 Amps max (95Watts) - To Power Macbook Pro 15 17 and other 18-20V notebooks 12V port: 2 Amps max - To Power CD DVD and any cigarette port accessory with optional socket. USB Port: 1 Amp max - To Power any USB cabled device. Size: 11.5' x 8.5' X 0.75' Weight: 3.1 lb Over-Current Protection. On/Off Switch.