GOOLOO S4 4A 6V/12V Smart Car Battery Charger & Maintainer — LCD Status, Desulfation

The GOOLOO S4 is a compact 4-amp smart charger and maintainer for 6V/12V lead-acid and 12V LiFePO4 batteries, combining trickle charging, float maintenance, and desulfation in one unit.

Whether you store a motorcycle through winter, keep a classic car battery alive, or maintain batteries on ATVs, boats, and lawn equipment, the GOOLOO S4 offers automatic, hands-off charging with protective intelligence. It supports multiple battery chemistries (WET, SLA, GEL, AGM, FLOODED, VRLA and 12V LiFePO4), displays charging status on an LCD, and adapts charging to temperature to avoid over- or under-charging.

How does the S4 safely charge different battery types?

The S4 uses a 10-stage smart charging algorithm that selects the appropriate charge profile for common lead-acid chemistries and 12V LiFePO4 cells. Safety features and temperature compensation minimize risk of overcharge and extend battery life without manual monitoring.

• Automatic detection for 6V and 12V batteries and multiple chemistries
• Temperature-aware charging to prevent undercharge in cold or overcharge in heat
• Zero-overcharge float mode for long-term maintenance
• LCD indicators for voltage, mode, and battery level

Can the GOOLOO S4 restore a weak or sulfated battery?

The unit includes an auto-repair/pulse desulfation function designed to reverse some sulfation by applying controlled pulse currents. It can attempt recovery on batteries with low voltages down to around 3V, though success depends on battery condition and age.

• Pulse current desulfation to break down lead sulfate buildup
• Works on deeply drained batteries (as low as ~3V) when recovery is possible
• Integrated monitoring to switch from repair to normal charging when appropriate

What display and controls help me monitor charging progress?

The S4 features a clear LCD that shows charging voltage, selected mode, and battery level so you can glance at status without guessing. A blinking 'V' indicates the unit has entered maintenance mode, signaling the charger is keeping the battery topped up rather than actively bulk-charging it.

• LCD shows real-time voltage and charge stage
• Mode indicators for charging, maintenance, and desulfation
• Simple plug-and-play connections with included clamps or ring terminals

How versatile is the S4 for different vehicles and gear?

This charger is built for multi-use: it suits everyday vehicles and seasonal equipment alike. From cars and trucks to motorcycles, scooters, RVs, boats, and lawn tractors, the S4 provides steady maintenance and occasional recovery without needing frequent user intervention.

• Rated for cars, motorcycles, ATVs, SUVs, boats, RVs, lawn mowers and more
• Compact design for easy storage in a garage or trunk
• 4A charging current ideal for topping up and maintaining batteries over time

Who is this for: The GOOLOO S4 suits vehicle owners, hobbyists, and fleet managers who want a reliable, compact charger to maintain 6V/12V lead-acid batteries and 12V LiFePO4 cells. It is especially useful for people who store seasonal equipment, maintain classic cars, or need a safe, automatic unit that reduces the risk of overcharging while offering occasional battery recovery.

Package and support: The S4 ships with necessary connectors for clamp and terminal attachment, an informative LCD to keep you informed, and a manufacturer-backed 18-month warranty plus customer support for setup and troubleshooting.