CTEK battery chargers aren't just boosters:  they charge and maintain batteries with a patented system that's battery and electronics friendly. 

CTEK designed these elegant, compact chargers to be water and shock resistant, and they're UL-approved for outside use and immune to power line fluctuations.  Your batteries will be charged efficiently with no interruption in their charging cycles.  CTEK chargers' safety systems feature sparkless connections that won't allow you to damage your vehicle's electrical system, even if you hook them up backwards.

The US 800 can charge up most small batteries found in lawnmowers, jet skis, snowmobiles, and motorbikes.  For your larger batteries, including car & truck applications, it offers maintenance charging that prolongs the life of your battery by preventing complete discharge and acid buildup.  It is perfect for any type of vehicle that only gets used seasonally.

The US 800 uses a 3-stage cycle of energizing your battery, filling it with power, and maintaining its charge.  This cycle repeats itself whenever the battery's voltage drops too low.  And never fear for your audio equipment or other electronics:  CTEK battery chargers are completely safe to use without having to disconnect your system.