Of course this black puffer vest is going to keep you warm even without plugging it in. But with the 7-volt lithium ion battery hooked up and securely stored in a zippered compartment within the left warmer pocket, this thing goes off.

The battery has a built-in controller to toggle between four heat levels, which promise between 2-8 hours of heat.

In addition to a back panel and two chest panels, this vest also offers the appreciated back-of-the-neck heated panel—killing chilly backdrafts before they stand a chance.  

This water-resistant and windproof vest combines powerful performance with popular style. Constructed with 200-fill synthetic down this puffer is designed to be close-fitting for added warmth.

Gerbing 7V Battery Heated Vests Include: 

• 7V 3400 mAH Rechargeable Lithium-ion Battery Pack (25.16Wh)
• Single Wall Charger
• Detailed Instructions
• Gerbing Lifetime Warranty

Khione Vest 2.0 Features: 

• Four Microwire heating zones: Collar (1), Chest (2), & Back (1)
• 135° F Maximum heat
• Active heat retention technology
• Heats for hours
• Water-Resistant and Windproof
• Comfortable & Stylish Fit
• Durable ripstop fabric construction
• Battery Integrated Temperature Controller

The battery has 4 heat settings as indicated by lights and Heat Times: 

• 100% (4 red/blue lights) - 2 Hours
• 75% (3 red/blue lights) - 3 Hours
• 50% (2 red/blue lights) - 5 Hours
• 25% (1 red/blue lights) - 8 Hours 

Charging Battery:  (We recommend charging overnight for the first charge.)

• Charge 100% before use (a full charge takes about 3 hours).
• A red light will appear on the wall charger when charging.
• The red light will change to green when charged.
• Maintain at least 25% power when the battery is not in use. This practice will prolong the life of any 7V battery. 

How it Works: 

• Step 1: Power on by pressing and holding the power button.
• Step 2: To change temperature, press and hold the power button until the LED light reflects desired setting. *Power level setting can only be indicated when connected to the garment.
• Step 3: Check remaining battery life by disconnecting the battery from the product. Press and hold the power button, the LED indicator will show 1 to 4 lights.
• LED lights will illuminate to indicate remaining power (4 lights are full power).

Turning on the Heat:

• Step 1: Locate the power pocket; it will be on the wearer's left outer pocket.
• Step 2: Open the pocket and locate the power plug.
• Step 3: Turn on the battery by holding the power button until it lights up.
• Step 4: Insert the plug into the battery port and push down to secure it in the plug holder.
• Step 5: Push the power button on the battery to select the setting you would like.
• Step 6: Place the battery into the pocket and close the pocket.