Fast Dispatch Available
Buy Direct & Save
Hassle Free Returns

KickAss has warehouses located on both the East and West Coast of Australia. Express orders are dispatched same business day if ordered before 12pm AEST. Standard orders are dispatched within 2-3 business days. Deliveries are made during business hours, Monday to Friday.


At KickAss, we take full control of our product journey - from concept to creation - by designing, engineering, and manufacturing our own batteries and 12V accessories in our wholly owned facilities located in Australia, China, and the USA. This end-to-end approach allows us to maintain strict quality standards, drive innovation, and deliver unbeatable value. By owning our production facilities, we ensure every product that carries the KickAss name is built tough, tested rigorously, and ready for off-grid adventure.






Change your mind? No worries, our quick & easy online or in-store returns process has you covered. Learn more.







Automatic 9 stage smart charging
Automatic 9 stage smart charging

The charger is controlled by a high-tech microprocessor that charges the battery in 9 separate stages. The microprocessor senses the requirements of the battery, and delivers the optimal current and voltage. This means your battery charges at maximum efficiency, every time.

Smart Maintenance Charging​
Smart Maintenance Charging​

This 4A AC to DC battery charger is designed as a maintenance charger, ideal for keeping your battery fully charged and in optimal condition over time. It provides a steady, low-current charge that prevents overcharging while maintaining the battery’s health, making it perfect for long-term battery storage.

Adjustable output for different battery sizes
Adjustable output for different battery sizes

This versatile battery charger can be configured to provide the optimal charging output for different battery sizes and chemistries. With adjustable charging currents of 4A and 1A, it’s perfect for delivering a steady charge for long-term storage or infrequent use.

Compatible with multiple battery chemistries
Compatible with multiple battery chemistries

This charger is compatible with most common battery chemistries, including AGM, Gel, Lithium, LiFePO4, and Lead Acid. Additionally, the adjustable amperage output allows you to cater to the unique requirements of your specific battery.

Lithium activation mode
Lithium activation mode

If your lithium battery has dropped below the safety voltage parameters of its BMS, you can use the charger’s Lithium Activation Mode and it will charge your lithium battery until it reaches the cut-in voltage and can re-start normal charging cycles.

AGM recondition mode
AGM recondition mode

The AGM recondition mode will restore the capacity and performance of your AGM batteries by breaking down any built up lead sulphate deposits. This extends the battery life and improves performance, especially after long periods of disuse or deep discharges.

Multiple protection features
Multiple protection features

The charger includes multiple protective features to protect your valuable battery, including reverse polarity protection, short circuit protection, and overheating protection.

Integrated Battery & Alternator Tester
Integrated Battery & Alternator Tester

  • Battery Health Test
  • Battery Starting Power Test
  • Alternator Performance Test

Benefit: A one-stop shop to test your starter battery health, cranking power, and alternator performance of your vehicle that allows you to identify any potential issues in your vehicle early, preventing breakdowns and ensuring reliable starts.

MEGA MAY MARKDOWNS
FINAL WEEK - ENDS SUNDAY
SHOP NOW

Connect via Anderson connectors or alligator clips
Connect via Anderson connectors or alligator clips

For added convenience and versatility, you can connect via Anderson connectors or alligator clips.

Fully compliant
Fully compliant

The battery charger is fully compliant with Australian standards, and offers maximum safety protection.

What's Included
What's Included

  • 1x KickAss Flexicharge 4A Smart 12V/6V Battery Charger
  • 1x Anderson to Alligator Lead
  • 1x Anderson to Ring Terminal Cable
  • 4x Mounting Screws

STILL ON THE FENCE?

See why our customers are all in—these reviews speak for themselves!

4.8
Rated 4.8 out of 5 stars
Based on 46 reviews
Total 5 star reviews: 42 Total 4 star reviews: 1 Total 3 star reviews: 2 Total 2 star reviews: 1 Total 1 star reviews: 0
46 reviews
  • Andrew Y.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    21 seconds ago
    Great little unit

    Bought this unit to set up as a constant trickle charger for a vehicle that doesn't get used often. A job it does well with the variable amps feature. Have also used it as a conventional battery charger on flat batteries and done the heavy lifting there also. Great value for money.

  • Tom S.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    5 days ago
    Battery charger

    Very happy with this product will be buying more from kikass

  • Thomas H.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 weeks ago
    4 amp battery charger

    This product is a great little charger easy to use and was great value highly recommend

  • James A.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 weeks ago
    Awesome

    Awesome

  • DJ Q.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 weeks ago
    Flexicharge 12V 4A ACDC Smart Battery Charger

    Works amazingly especially for the price

Frequently Asked Questions

How much current can the KickAss Flexicharge 12V 4A charger deliver when charging my battery?
The KickAss Flexicharge delivers a maximum charging current of 4 amps at 12 volts, with an adjustable output allowing you to select either 1 amp or 4 amps depending on your battery size. This flexibility ensures precise and efficient charging tailored to your battery’s needs.
Can I use this charger with different types of batteries like AGM or lithium?
Yes, the KickAss Flexicharge is compatible with multiple battery chemistries including lead acid, AGM, GEL, and LiFePO4 lithium batteries. It features dedicated charging modes for each type to ensure safe and effective charging.
How do I safely connect and start charging my battery with this charger?
To safely charge your battery, first position the charger near your battery and connect it to AC power. Then select the correct battery type mode, connect the alligator clamps to the battery terminals (red to positive, black to negative), and finally connect the Anderson connector to the charger.
What safety features does the KickAss Flexicharge have to protect me and my battery?
The charger includes reverse polarity protection, short circuit protection, and overheating protection. For example, if clamps are connected incorrectly, the red LED will blink and charging won’t start, preventing damage. If the internal temperature reaches 95°C, the charger reduces current to 2A to avoid overheating.
Can I use the charger to revive an old or unused AGM battery?
Yes, the KickAss Flexicharge features a special AGM Recondition mode designed to deliver a specialised charge to AGM batteries that haven’t been used for some time. This helps restore battery capacity and prolongs battery life.
What are the physical dimensions and operating conditions for this charger?
The charger measures 18.5cm long, 9cm wide, and 5.5cm high, and operates safely within a temperature range of -10ºC to 40ºC. It is designed for indoor use only with input voltage of 220-240V at 50Hz.
How does the charger handle power interruptions during charging?
If mains AC power is disconnected during charging, the charger remembers the current charge settings and automatically resumes charging in the same mode once power is restored, provided the battery clamps remain connected.
What connection options are available for attaching the charger to my battery?
The KickAss Flexicharge offers two connection methods: an Anderson-style connector and alligator clamps. This dual option allows you to easily connect to various battery terminals and setups.
FIND A KICKASS INSTALLER

Need a hand installing your KickAss gear? Find approved installers in your local area.

BOOK A 1-ON-1 CHAT WITH A 12V EXPERT

Got questions about your off-grid power setup? Book a consultation with one of our 12V experts.

VISIT A KICKASS RETAIL STORE

Drop into our Brisbane, Sunshine Coast, Sydney, Melbourne, or Perth stores for friendly expert advice and hands-on support.

×
KA CLUB

Join for FREE and be rewarded...

Your exclusive discounts have been applied to this session. We will use your checkout details to complete your signup later. You can opt out at any time. Enjoy!