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BiXPower High Capacity (192 Wh or 52,000 mAh) Selectable Output Voltage (12V 15V 16V 18.5V 19.5V 20V 24V) Rechargeable Ltihium ion Battery -
This power pack comes with BiXPower CP190 High Capacity (192 Watt-Hour, or 52,000 mAh) Light Weight Lithium Battery and BiXPower DD90X Multi Voltages DC Power Adapter. The battery capacity is 192 Watt-hour. Most laptops' internal battery capacity is only around 50 Watt-hour ~ 75 Watt-hour. The battery pack comes with a multi output voltages DC to DC power converter that can convert and stabilize the battery output to many different voltages, such as 

Price is $300.00
Price: $299.95