---
product_id: 315679656
title: "GOOLOO S4 4 Amp Car Battery Charger Automotive, 6V/2A 12V/4A Smart Trickle Charger Maintainer with Supply Mode, Automatic Motorcycle Battery Charger for Truck Lawn Mower RV Boat Lead-Acid Battery"
brand: "gooloo"
price: "¥14270"
currency: JPY
in_stock: true
reviews_count: 13
category: "Gooloo"
url: https://www.desertcart.jp/products/315679656-gooloo-s4-4-amp-car-battery-charger-automotive-6v-2a
store_origin: JP
region: Japan
---

# 4A max charging power Smart LCD with real-time battery status Supports 6V & 12V lead-acid & LiFePO4 GOOLOO S4 4 Amp Car Battery Charger Automotive, 6V/2A 12V/4A Smart Trickle Charger Maintainer with Supply Mode, Automatic Motorcycle Battery Charger for Truck Lawn Mower RV Boat Lead-Acid Battery

**Brand:** gooloo
**Price:** ¥14270
**Availability:** ✅ In Stock

## Summary

> 🔌 Power Up Smarter, Drive Confidently!

## Quick Answers

- **What is this?** GOOLOO S4 4 Amp Car Battery Charger Automotive, 6V/2A 12V/4A Smart Trickle Charger Maintainer with Supply Mode, Automatic Motorcycle Battery Charger for Truck Lawn Mower RV Boat Lead-Acid Battery by gooloo
- **How much does it cost?** ¥14270 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/315679656-gooloo-s4-4-amp-car-battery-charger-automotive-6v-2a)

## Best For

- gooloo enthusiasts

## Why This Product

- Trusted gooloo brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Real-Time Monitoring:** Clear LCD display shows voltage, charging mode, and battery level so you’re always in control.
- • **Universal Compatibility:** Works seamlessly with WET, SLA, GEL, AGM, VRLA, flooded, and 12V LiFePO4 batteries for all your vehicles.
- • **Worry-Free Maintenance Mode:** Automatic trickle and float charging keeps batteries healthy long-term without risk of overcharging.
- • **Smart Temperature Adaptation:** Automatically adjusts charging to prevent overcharge in heat and undercharge in cold—perfect for any climate.
- • **Revive & Restore Dead Batteries:** Advanced 10-stage intelligent charging with pulse current desulfation brings tired batteries back to life.

## Overview

The GOOLOO S4 is a versatile 4 Amp smart battery charger and maintainer designed for 6V and 12V lead-acid and LiFePO4 batteries. Featuring a 10-stage intelligent charging program with pulse current desulfation, it revives deeply discharged batteries and adapts charging based on ambient temperature. Its LCD screen provides real-time battery status, while automatic maintenance modes ensure safe, long-term battery health across cars, motorcycles, lawn mowers, RVs, boats, and more.

## Description

Buy GOOLOO S4 4 Amp Car Battery Charger Automotive, 6V/2A 12V/4A Smart Trickle Charger Maintainer with Supply Mode, Automatic Motorcycle Battery Charger for Truck Lawn Mower RV Boat Lead-Acid Battery: Battery Chargers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Best for Reviving Seriously Dead Car Batteries! - Probably one of the better 12VDC chargers on the market for lead acid car batteries. The key is including a "12VDC supply" fixed voltage (low amps) option on the charger. Most chargers have safety features (rightly so) that prevent charging a deeply cycled and drained battery (e.g., <10VDC resting). The only way to get the voltage back up is to used a fixed supply, under careful supervision (charge/rest cycles). The 12VDC supply allows for that, and then you can transition to a maintenance trickle charger, or whatever, to get the battery fully charged. I liked it so much, I bought a second one. Highly recommended!
Review: After 2 Years of Use - Still Going Strong - I bought the 4V unit just over 2 years ago and use it to keep my bike and my lawn tractor topped off in the cold winter months. Works great in keeping my batteries ready to go, haven't had any battery issues so I can't speak to it's other features, but it does what we need most and after 2 years it's still workin. I like that it tells me the voltage my battery is putting out and the level of charge via it's LCD display. Quality of manufacturing and accessories is good, I wouldn't hesitate to purchase again or recommend to friends and family.

## Features

- It's the all-in-one universal charging solution - battery charger, battery maintainer, trickle charger, float charger, plus battery desulfator. Designed for 6-volt and 12-volt lead-acid batteries, like WET, SLA, GEL, AGM, FLOODED, VRLA batteries, and more, plus 12volt LiFePO4 batteries.
- Auto repair and pulse current charging devulcanize battery to restore the battery lost performance with the GOOLOO 10-stage intelligence charging program, and can charges batteries as low as 3 volt.
- Intelligently adapt to different ambient temperatures to eliminate over-charging in hot climates and under-charging in cold climates.
- The LCD display showing charging voltage, charging mode, battery levels.etc. 'V' blinks on the screen means enter maintenance mode.
- Not only a battery trickle charger, also an advanced battery charger maintainer. A fully-automatic, worry-free smart battery charger for everyday and long time use with zero overcharge, for cars, automobiles, motorcycles, scooters, lawn mowers, ATVs, tractors, trucks, SUVs, RVs, boats, PWCs and more.
- We provide an 18-month warranty, if you have any questions, please feel free contact us, our customer service team will provide you with technical support and warranty services.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0919PGCNS |
| Amperage | 4 Amps |
| Best Sellers Rank | #12,347 in Automotive ( See Top 100 in Automotive ) #105 in Battery Chargers |
| Brand | GOOLOO |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,381) |
| Date First Available | March 29, 2021 |
| Item Weight | 1.32 pounds |
| Item model number | S4 |
| Manufacturer | GOOLOO |
| Manufacturer Part Number | speed4 |
| Product Dimensions | 3.35 x 9.06 x 1.97 inches |
| Voltage | 120 Volts (AC) |
| Wattage | 60 Watt-hours |

## Product Details

- **Brand:** GOOLOO
- **Color:** red
- **Item Weight:** 1.3 Pounds
- **Output Voltage:** 12 Volts (DC)
- **Product Dimensions:** 3.35"D x 9.06"W x 1.97"H

## Images

![GOOLOO S4 4 Amp Car Battery Charger Automotive, 6V/2A 12V/4A Smart Trickle Charger Maintainer with Supply Mode, Automatic Motorcycle Battery Charger for Truck Lawn Mower RV Boat Lead-Acid Battery - Image 1](https://m.media-amazon.com/images/I/61p8QqhypmL.jpg)

## Questions & Answers

**Q: Hmm, i could see this mode on the s6:   6v std：for charging 6v small standard lead-acid batteries. was not in my mode????**
A: the manual states hold the mode button for 5 seconds to change to 6 v

**Q: Can i attach it inside the hood of the car, using an extension cord and leave it 24/7 for the winters in Canada??**
A: Yes it will maintain your battery all Winter I use mine in a RV when not in use.

**Q: Can this be used with the battery still installed in the vehicle as a battery maintainer?**
A: Yes, it can be used as a maintainer. It is manufactured to maintain as well.

**Q: How long are the jumper cables?**
A: Approximately 2-foot from the charger and then about 10 foot of cord to plug in the charger.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Best for Reviving Seriously Dead Car Batteries!
*by A***D on December 30, 2025*

Probably one of the better 12VDC chargers on the market for lead acid car batteries. The key is including a "12VDC supply" fixed voltage (low amps) option on the charger. Most chargers have safety features (rightly so) that prevent charging a deeply cycled and drained battery (e.g., <10VDC resting). The only way to get the voltage back up is to used a fixed supply, under careful supervision (charge/rest cycles). The 12VDC supply allows for that, and then you can transition to a maintenance trickle charger, or whatever, to get the battery fully charged. I liked it so much, I bought a second one. Highly recommended!

### ⭐⭐⭐⭐⭐ After 2 Years of Use - Still Going Strong
*by G***R on August 26, 2025*

I bought the 4V unit just over 2 years ago and use it to keep my bike and my lawn tractor topped off in the cold winter months. Works great in keeping my batteries ready to go, haven't had any battery issues so I can't speak to it's other features, but it does what we need most and after 2 years it's still workin. I like that it tells me the voltage my battery is putting out and the level of charge via it's LCD display. Quality of manufacturing and accessories is good, I wouldn't hesitate to purchase again or recommend to friends and family.

### ⭐⭐⭐⭐⭐ works great.
*by K***R on December 31, 2025*

works great.

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-08*