HOTRC A400 Digital 3S/4S Smart LiPo Balance Charger

Smart Balancing and Safety

The A400 is engineered to protect your battery investment. It features a dedicated 300mA/cell balanced current that ensures every individual cell in your 3S or 4S pack is charged to the exact same voltage. This precision prevents cell degradation and safety hazards caused by imbalances. With built-in overcharge protection and an ABS+PC fireproof shell, you can charge with confidence knowing your equipment is safeguarded against electrical faults.

User-Friendly Digital Interface

Unlike older analog chargers that rely on blinking LEDs, the HOTRC A400 from RoboShop BD features a clear Nixie tube display. This screen shows the current battery voltage with ±0.05V accuracy, allowing you to monitor the charging progress at a glance. It is incredibly easy to use: simply plug the charger into a wall outlet, connect your battery’s balance lead, and the charger automatically begins its intelligent charging cycle.

Key Features

• Built-in Power Supply: Universal 100-240V AC input—no extra power brick required.

• 3S/4S Dual Support: Compatible with the most popular battery sizes for FPV racing and long-range drones.

• Fast Charge Capability: Up to 3000mA (3A) charge current for reduced downtime at the field.

• Portable & Lightweight: Weighing only 135g, it is easy to carry in any drone gear bag.

• Discharge Function: Can act as a basic discharger to bring batteries to storage voltage when unplugged from AC power.

• Synchronous Rectification: Advanced internal circuitry for higher efficiency and lower heat generation.

Technical Specifications