Edited September 7, 2017
at 10:58 AM
This is cheaper than a similar deal about a year ago:
Black & Decker Power To Go Lithium Battery Booster P2G7B $15.98 at Home Depot or Amazon
Many features come in a small package with the BLACK+DECKER Power2Go Lithium-Ion battery booster. This compact, convenient device can help boost most cars and trucks batteries safely from inside your vehicle through DC accessory outlet. Or connect directly to the battery with the clips provided. Equipped with a Lithium-Ion battery and a high output USB port, the Power2Go unit also functions as a portable power supply, able to charge and power smart phones, tablets and more. The Power2Go is small enough to fit into the glove box and can hold a charge for up to 1-Year.
Plug, charge and go from inside your vehicle
2 Amp USB charges and/or powers many electronic devices
Illuminated LED changes color to indicate charging stage
Includes battery clips and 12-Volt accessory plug
Shipping is Free
Shipping is Free for Prime users.