The best USB car charger is the compact but powerful  VOLT 12 W + 12 W. At 1 amps, it’s rated as one of the most powerful car chargers you can buy. When we had an engineer test the claim, it exceeded advertised performance specs, which means it provides the fastest charge possible for tablets and phones outside of a wall plug. We seriously considered and tested 8 models to find that though other chargers are as powerful, exceeds its power claims, is by far the most compact charger available, and has the benefit of being cheap as well. 

 

• Ultra-thin, lightweight design
• 1 amps delivers 12 watts of intense power
• Charges directly from your vehicle’s 12-volt or USB power port
• Detachable cable to syncs apps, music, movies and data from your Mac 

Includes

• USB charger
• Genuine Official NEEDITNOW iPhone Lighting Charging Cable.

COMPATIBLE WITH

•  iPhone 3G, 3GS / 4 / 4S,5,5S iPod, iPad, iPad
• HTC HD2, HD 7, Increadible S, Touch DUAL etc.
• HTC Desire Z, Desire S, Desire HD
• Other HTC mobile phone with Micro USB port
• Samsung Galaxy S, Nexus S, Galaxy Note, Google Nexus
• Nokia N8, N79, N85 etc
• Amazon Kindle 2, 3
• Blackberry 9780, Torch 9800 etc.