Chrome Battery has a great selection of the most reliable types of 4.2 AMP battery Chargers/Maintainers. Xtend Chargers offers our 4.2 Amp Charger to replace your existing battery charger and bring your battery back to life. Our fully automatic 4.2 AMP Xtend Chargers are a brilliant 1-4.2amp charger, which charges at 1 up to 4.2amps, it just knows what amp to charge at with a built in intelligent chip. If the battery only needs a top charge the intelligent chip will only deliver 1 amp for a short time till the battery is fully charged. If the battery is deeply drained the intelligent chip tells the charger to go up to 4.2amps to bring the battery to a full charge. WHAT A SMART CHARGER. Our Xtend Chargers are designed for safety and to protect against reverse battery hookup, overheat/overcurrent and over-charging of batteries. Bring batteries back to life as well as contributes to the health and longevity of your battery. For use on all 6V and 12V battery systems including SLA, AGM and Gel Batteries. Each of our chargers comes wih the quick disconnect harness. Creates ease of use with a fully digital LCD screen and a three LED indicator lights. Yellow for charging, Green for fully charged/float-mode - and Red for a faulty battery. Guaranteed to meet or exceed original specifications. Top notch Customer Service and Satisfaction is our top priority at Chrome Battery. Affordable Pricing. 5 Year Warranty. Midwest location in the heart of America (Indiana). Chrome Battery strives to provide every customer with an exceptional buying experience and top quality chargers at unbeatable prices. Thank you for choosing 4.2 AMP Xtend Charger by Chrome Battery; your business is greatly appreciated.