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Smartech 3.5A 6/12V Smart Automotive Battery Charger, Maintainer, Repairer, Tester with Advanced Desulphation Process

(1 customer review)



  • Test, Repair, Charge, and Maintain all types of 6-12V batteries
  • Charge fully-drained, lead-acid batteries up to 120Ah
  • No need to unplug; safely maintains battery 24/7
  • Built-in, intelligent microprocessor protects against reverse polarity, short circuit, open circuit, over-current, overheating, overcharging protection
  • Spark proof design
  • Variable input compensation (100% charge despite varying AC input voltages)
  • Fault Protection
  • Auto memory feature returns to last selected mode on restart
  • High Frequency, High Efficiency
  • Interchangeable connectors
  • Rapid-charge technology safely charges twice as fast as traditional chargers
  • Works on multiple battery chemistry types
  • Cold/AGM mode for charging AGM batteries or at low temperatures
  • Small Battery Mode Safely charges small 12V batteries
  • IP-65 Dust and Water resistant
  • Lightweight and Heavy Duty
  • Interchangeable connectors – eyelet terminals and alligator clamps included

Out of stock


IC-3500 – 6/12V 3.5A Smart Automotive Battery Charger

The Smarter™ 6/12V 3.5A Smart Automotive Battery Charger is capable of testing, charging, maintaining, and even repairing all types of 6V and 12V lead-acid batteries and 12V Lithium batteries. It has a built-in intelligent microprocessor which makes charging faster, easier, and safer to use. Safety features include spark proof circuitry, reverse polarity, short circuit, over current, overcharge and overheating protection. Keep it connected 24/7 without damaging the battery and keep your battery ready to use.

Smarter battery chargers offer expanded features not found on most chargers. Use the IC-3500 to diagnose and repair your batteries with advanced diagnostics, desulphation, destratification, and optimization. Regain 100% of your battery’s capacity – the IC-3500 is capable of recovering battery voltages that are too low for traditional chargers to detect!

The Smarter™ IC-3500 3.5 AMP 6-12V Battery Charger features a Small Battery Mode to allow you to charge batteries from 2-120Ah and safely maintains 6V and 12V lead-acid batteries of all sizes.

With a dedicated Repair Mode for deeply stratified or sulphated batteries, the Smarter™ 3.5A 6V/12V Battery Charger could save an otherwise “dead” battery.


Superior versatility.

Other manufacturers make you buy a separate battery charger for 12V charging, for 6V charging, for AGM batteries, for cold conditions, for lithium-ion batteries, and yet another for battery repair! Our multi-function battery chargers deliver higher performance and completely eliminate the clutter! With the simple push of a button, you’ll be able to switch between charging modes using just one device. The IC-3500 is fully-loaded, with an adaptive, 8-step repair process for recovering heavily sulfated and weak 12-volt batteries.


12V Small Mode

Made for charging (900mA) smaller battery applications. Both Small Norm and Cold/AGM settings are perfect for Motorcycles, Snowmobiles, ATVs, and Jet Skis.

6V Norm Mode

Designed for charging starter and deep-cycle 6-volt lead-acid batteries, including Wet Cell, Gel Cell, Enhanced Flooded, Calcium, and Maintenance-Free.

12V Lithium Mode

Designed for charging lithium-ion batteries that include a battery maintenance system (BMS), including lithium iron phosphate batteries.

12V Repair Mode

An advanced battery recovery method for improving the lifespan of heavily sulphated and old 12V batteries that can restore lost battery capacity.

Keep Your Batteries Ready.

The IC-3500 is a remarkable maintainer for 6V and 12V lead-acid batteries. It automatically determines the maximum capacity of your batteries and constantly monitors charging conditions to ensure that you experience top performance without worrying about constantly checking for charging issues.

 Click and Drag to View in 3D

 Sometimes bigger isn’t better

Our smart battery chargers utilize the latest battery charging technology. Smartech battery chargers are built on a high-frequency and high-efficiency foundation, which converts energy faster than traditional automotive battery chargers. The efficiency of our chargers allows us to make them compact, lightweight, and incredibly portable. Our chargers minimize energy consumption and maximize your time; charging two times faster than old, linear chargers.

Safe to leave connected with zero overcharging.

Most manual, automatic or semi-automatic battery chargers continuously trickle charge batteries. Traditional chargers are susceptible to overcharge, thus limiting battery life. Our intelligent battery maintenance technology monitors battery activity, and only begins charging when needed. This system allows for continuous operation without user intervention, and zero risk of overcharging your battery.


Smart Features to keep you safe.
Completely Spark Proof • Fault Protection • Reverse-Polarity Protection


Plus Protection from Short Circuits, Open Circuits,
Overheating, Over-Current, and Overcharge


Hangs around, there when you need it

The IC-3500 not only includes mounting holes and hardware, it comes with a built-in bracket so you can hang it from a hook, nail, or screw for quick and convenient placing of your charger.


Plug & Play.
Battery maintenance made simple.

It’s as simple as connect and forget. No wonder it’s the ultimate in battery maintenance. Quickly connect and disconnect the battery charger whenever you need. It remembers the last mode selected and automatically resumes charging when the power comes back on. The IC-3500 keeps any battery fully charged without supervision.



Battery charging with intelligence.

Charging batteries can be frustrating. Often, the charger will not even detect a battery is connected if the charge is too weak or the cells are damaged. Understanding and finding a solution is just as critical. Introducing advanced diagnostics, which analyzes battery feedback and display a particular error pattern if a problem is detected. Each flash pattern tells you what’s wrong, and how to fix it.

Light(s) Condition Cause(s)
Solid Red Warning! LED Reverse Polarity
Flashing Red Warning! LED Open-circuit, Dirty Battery Posts, Dead Battery, or Output Short Circuit
Slow flashing Red Warning! LED + Corresponding charging mode LED Charging in 6V Mode(s) for 12V battery
Quick flashing Red Warning! LED + Corresponding charging mode LED
Battery cannot store electric charge during charging process
Only charging mode LED is on, and four battery level indicator LEDs are all off Overheat Protection
Solid Yellow REPAIR LED + Corresponding 12V charge mode LED In 12V REPAIR Mode
Only corresponding charging mode LED + Four battery level indicator LEDs are all OFF In Desulphation Process
Red Warning! LED light flashes twice and stops for 3 secs and repeats Battery cannot be recovered through Desulphation Process or Battery cannot be recovered through Repair Mode
Flashing Yellow Warning! LED (for both 6/12V lead-acid batteries) Heavily Corroded Battery (voltage is less than 3V), need REPAIR Mode


Battery Charging vs. Battery Maintenance.

Which battery charger is right for you?

Selecting the proper battery charger depends on your needs. Do you need to recharge a dead battery entirely, or just keep a battery at full charge? Battery charging means you need to recharge a dead battery fully, whereas battery maintenance requires a mere trickle charge. Most battery chargers perform both functions, but understanding their limits and the amount of time to recharge depends on the size of the battery and vehicle. The IC-3500 is designed for charging smaller applications, like a motorcycle, ATV, snowmobile, or lawn and gardening equipment. It is also a perfect battery maintainer for a car, boat, RV, or truck. The charging time chart not only helps you determine how long it will take to recharge, but also its limits between battery charging and battery maintenance.


skeleton view of the IC-3500 battery charger

Efficient design. Compact, yet powerful.

Our combination of electrical engineering and industrial design creates a powerful battery charger with a small form-factor. It uses (HF) high-frequency switch-mode technology to efficiently convert alternating current (AC) to direct current (DC) for battery charging. Its microprocessor adapts to variations in current flow to precisely control the charging to minimize power leaks.


Maximum performance.
Rugged, water-resistant plug & play connectors.

Connect directly to any battery with the beefy battery clamps or permanently attach the eyelet connectors for super-convenient charging. However you choose to charge, the IC-15000 comes with interchangeable connectors that create a reliable, weatherproof connection that provide maximum current flow but easy to plug & play.


Technical Specifications


What’s Included • IC-3500 Battery Charger

• Set of Terminal Clamps

• Set of Eyelet Cables

• User Guide and Warranty Information

• Spare fuse

• Mounting screws

Input Voltage (AC)

85-135 VAC, 50-60Hz; Variable Power, 60W Max.

Battery Voltages 6-Volt and 12-Volt Lead-Acid and Lithium-Ion Batteries
Battery Types Wet Cell (Flooded), Gel Cell, Calcium, Lithium, AGM, Enhanced Flooded Battery or any Maintenance-Free Battery
Battery Capacity Range • 2-120Ah (12V)

• 2-120Ah (6V)

• Maintains all battery sizes

Charging Amperage 3.5 Amps
Power Consumption 60 Watts (Maximum)
Ingress Protection (IP) IP54
DC Cable 78-Inches
AC Cable 77.5-Inches