KickAss Flexicharge 12V 50A ACDC Smart Battery Charger For Lead Acid, AGM & Lithium Batteries + Integrated Bluetooth

KickAss Flexicharge 12V 50A ACDC Smart Battery Charger For Lead Acid, AGM & Lithium Batteries + Integrated Bluetooth

Support Page User Manual

The KickAss Flexicharge 12V 50A ACDC Smart Battery Charger is built for serious off-grid, touring, and workshop setups. Engineered for fast charging high-capacity batteries like the KickAss Ultra-X range, it delivers powerful performance, intelligent control, and flexibility across multiple battery types – keeping your system running reliably on the road, on-site, or on shore power.

Fast, Controlled 50A Charging

Delivering up to 50 amps of output, this charger rapidly restores power to large lithium batteries and high-capacity systems. Capable of recharging a 200Ah lithium battery in as little as four hours, it’s engineered for serious power users who need their batteries charged efficiently and safely.

Fully Adjustable Output

Choose from 50A, 32A, 16A, or 4A charging modes to suit your setup. Whether you’re maintaining a small vehicle’s starter battery or powering a large lithium bank, this charger gives you precise control to ensure optimal performance and battery longevity.

Smart Bluetooth Control

Monitor and manage your charging system directly from your smartphone. With built-in Bluetooth connectivity, you can set battery type, adjust charge parameters, and view live voltage, current, and system status – all without touching the charger.

Multi-Chemistry Compatibility

Designed for total flexibility, this charger supports Lead Acid, AGM, Gel, Calcium, and Lithium batteries. It automatically applies the correct charging profile for each chemistry, ensuring the right balance of speed, safety, and battery protection.

Integrated Vehicle Diagnostics

Doubles as a diagnostic tool, checking alternator output, starter battery health, and cranking performance. Instantly identify weak points in your vehicle’s electrical system before they become roadside problems.

Dynamic Battery Maintenance

Once your battery reaches full charge, the charger switches to intelligent maintenance mode, monitoring voltage and applying a top-up only when needed. This prevents overcharging and keeps your system fully charged and ready.

Advanced Multi-Stage Charging

The smart 3-stage algorithm – bulk, absorption, and float – ensures fast, safe, and complete charging. Throughout the process, voltage and current are constantly monitored to deliver precision control, maximise efficiency, and extend battery life.

Intelligent Cooling & Quiet Mode

Temperature-controlled fans automatically adjust speed for efficient cooling with minimal noise. Activate Quiet Mode to further reduce fan operation and output current – ideal for overnight use or low-noise environments.

Simple Plug & Play Setup

With Anderson-style DC output and IEC AC input, installation is fast and flexible. Use the supplied Anderson-to-ring terminal cable for fixed installs or optional alligator clips for portable use, giving you connection options for any charging scenario.

Lithium Recovery & Starter Battery Replacement Mode

Includes a recovery function to safely revive lithium batteries that have entered low-voltage protection mode. It also operates as a regulated 12V DC power supply, for maintaining system voltage during battery replacement to avoid ECU resets or data loss.

EV and Hybrid Inverter Enabled Dual Battery Charger

Utilise the inverter in your EV, Hybrid or mild hybrid vehicle to charge our dual battery system through the 50A Smart AC Charger. Simply connect the charger input to the inverter output in the vehicle and you’ve got a plug-and-play dual battery system.

Clear LCD Display & Status Indicators

Stay informed with the integrated LCD screen, showing live voltage, current, and charge stage data. A status LED provides at-a-glance confirmation of charger operation and progress.

Built-In Protection & AGM Reconditioning

The Charge Guard system includes reverse polarity, short circuit, over-voltage, over-temperature, and over-current protection to safeguard your gear. Plus, an AGM Recondition Mode helps restore ageing AGM batteries by dissolving sulphate buildup and recovering lost capacity.

The KickAss Flexicharge can deliver up to 50 amps of charging current, allowing it to fast charge 12V lead acid, AGM, gel, and lithium batteries with capacities between 15Ah and 300Ah. It offers adjustable charge rates of 4A, 16A, 32A, or 50A to suit your battery size and type.
This flexible amperage means you can optimise charging speed without stressing your battery, whether you need a slow trickle charge or a rapid recharge. The intelligent 9-stage charging process ensures efficient and safe charging, maximising battery life while getting you back on the road or off-grid quicker.

Yes, the Flexicharge supports multiple battery chemistries including lead acid, AGM, gel, and LiFePO4 lithium batteries. It intelligently adjusts charging profiles for each type, ensuring optimal voltage and current settings for safe, effective charging.
This versatility means you only need one charger for all your 12V batteries, whether in vehicles, solar setups, or auxiliary systems. Special modes like AGM recondition and lithium recovery further enhance battery performance and longevity, making it a truly adaptable off-grid power solution.

To set up, place the charger on a stable, dry surface, connect the AC input cable to a 230V power source, then attach the Anderson plug and alligator clamps to your battery (red to positive, black to negative). Select the charging current and battery type using the mode button, then charging starts automatically.
The on-board LCD displays real-time charging status, and Bluetooth connectivity lets you monitor and control the charger remotely via the app. This straightforward setup process makes it easy to get reliable, intelligent charging wherever you are.

Absolutely. The Flexicharge includes comprehensive protection features such as reverse polarity, short-circuit, over-voltage, over-temperature, and over-current protection. It also advises against charging damaged or frozen batteries and requires lithium batteries to have an in-built Battery Management System (BMS) for safety.
These built-in safeguards ensure your batteries and vehicle remain protected during charging. Plus, the charger’s low-noise, temperature-controlled cooling fans maintain optimal operating conditions, giving you peace of mind while powering your adventures.

The Flexicharge features integrated Bluetooth connectivity, allowing remote setup and real-time status updates through a dedicated app. You can monitor charging parameters, switch modes, and perform battery health checks conveniently from your smartphone.
This smart connectivity enhances user experience by providing full control and insight into your battery’s condition, making it easier to maintain optimal performance and avoid unexpected power issues on the road or off-grid.

Yes, it includes specialised modes like AGM recondition mode to restore capacity in aged or underperforming AGM batteries, and a lithium recovery mode designed to revive low-voltage lithium batteries safely.
These features extend the life of your batteries, saving you money and reducing waste. By intelligently managing the charging process, the Flexicharge helps bring tired batteries back to reliable operation, making it a smart investment for long-term battery care.

The charger comes complete with an 80cm Anderson to ring terminal cable, alligator clamps, and a 180cm AC input cable. These accessories provide flexible and secure connections to a variety of battery setups.
This comprehensive kit means you can quickly install and start using the charger without needing additional parts, whether you’re charging vehicle starter batteries or auxiliary power systems, making it a convenient and ready-to-go solution.

The Flexicharge employs intelligent 9-stage charging combined with multiple protection features including reverse polarity, short-circuit, over-voltage, over-temperature, and over-current safeguards to prevent damage. It also recommends following battery manufacturer specifications for voltage and current limits.
This ensures your battery is charged efficiently and safely, maximising lifespan and performance. The charger’s smart technology adapts to battery condition and type, giving you confidence that your investment is well protected during every charge cycle.