Woot offers IN&OUT T8 800A Peak 18000mAh Car Jump Starter (up to 7.0L Gas, 5.5L Diesel Engine), 12V Auto Battery Booster for $49.99 (orig. $99.99) + Free Shipping with Prime. 

Product Description: 

POWERFUL BUT COMPACT:

• With 800 amps peak current, the T8 can jump start 12V cars, SUVs, trucks or vans up to 30 times on a full charge (charging takes 4.5 hours).
• It’s a compact power bank (18000mAh capacity), can charge your phone with dual USB ports (one is a 5v/9v Quick Charge) and power your other car accessories using a 12V 10A DC port.

TWO USB OUTPUT PORTS:

• Two USB Output Ports (Includes 5V/9V Quick Charge Port) can charge your cell phone and tablet safely and quickly at the same time.

12V DC OUTPUT PORT:

• 12V DC Output Port with the comes with Cigarette lighter adapter can power your other car accessories (Tire Inflator etc.).

LED EMERGENCY LIGHT: 

• LED Emergency Light with three modes(SOS Strobe and Flash), can be used as a multifunctional life saver.

LONG-LASTING STANDBY TIME:

• Unlike other car jump starters, you can manually turn the T8 ‘OFF’ to slow down the battery's self-discharge – allowing to the T8 to hold its charge for up to 12 months while not in use.
• Please remember to turn ‘ON’ before charging or it will not charge.