Product Overview
This manual provides instructions for the Blomiky 7.4V 900mAh Li-ion rechargeable battery and its accompanying charger cable, featuring an SM-3P plug. This battery is designed for use with various remote-controlled vehicles, including specific models of Amphibious RC Cars and RC Trucks.
The battery includes a built-in protection board to ensure safe operation and consistent performance.
Package Contents
The package includes the following items:
- 2 x 7.4V Li-ion Rechargeable Batteries with SM-3P Plug
- 2 x USB Charger Cables with SM-3P Plug

Image: Contents of the Blomiky battery and charger package, showing two batteries and two USB charger cables.
Setup and Charging
Battery Specifications and Connector
The Blomiky 7.4V Li-ion battery has a capacity ranging from 900mAh to 1100mAh. Its dimensions are approximately 54mm (2.12 inches) in length, 36.8mm (1.45 inches) in width, and 18.9mm (0.74 inches) in height. Each battery weighs approximately 60 grams.
The battery features an SM-3P black 3-pin plug. The red and blue cables are positive polar, while the black cable is negative polar. Ensure correct polarity when connecting.

Image: Detailed view of the battery showing its dimensions and the SM-3P plug connector.
Charging Procedure
To charge the battery, connect the SM-3P plug of the battery to the corresponding port on the USB charger cable. Then, plug the USB end of the charger cable into a compatible USB power source (e.g., a USB wall adapter, computer USB port, or power bank).
During charging, the green light on the charger will flash. Once the battery is fully charged, the green light will stop flashing and remain solid. The red light on the charger will remain solid throughout the charging process. A full charge typically takes approximately 2 to 3 hours.

Image: The battery connected to its USB charger, illustrating the charging indicator lights.
Video: An official demonstration of the Blomiky 7.4V 900mAh Li-ion battery, including details on its SM-3P plug, dimensions, and the charging process with indicator light behavior.
Operating Instructions
Compatibility
This 7.4V 2S Li-ion battery with an SM-3P connector is suitable for various RC vehicles, including:
- Threeking TK-3086B Pick-up 1:16 Scale Amphibious Waterproof RC Trucks
- Threeking 1:16 Pick-up TK-3082B 360-degree flips Waterproof RC Stunt Cars
- HOTDEER G03082R All Terrain Driving Monster Power Climbing RC Truck Cars
- G03086R and G03085R Spin Around 2.4GHZ RC Cars
Battery Installation
Refer to your RC vehicle's specific instruction manual for detailed steps on how to access and install the battery compartment. Ensure the battery is securely placed and the SM-3P plug is correctly connected to the vehicle's power port. The plug is designed to connect in only one orientation; do not force the connection.
Maintenance
Battery Care and Storage
- Avoid Overcharging: The charger cable includes a protection board to prevent overcharging. However, it is good practice to disconnect the battery once fully charged.
- Avoid Over-discharging: Do not completely drain the battery. Stop using the RC vehicle when you notice a significant drop in performance.
- Storage: Store batteries in a cool, dry place away from direct sunlight and extreme temperatures. For long-term storage, it is recommended to charge the battery to approximately 50% capacity.
- Handling: Handle batteries with care. Avoid puncturing, crushing, or exposing them to water or fire.
Troubleshooting
Common Issues and Solutions
| Problem | Possible Cause | Solution |
|---|---|---|
| Battery not charging | Charger not connected properly; faulty charger/battery; power source issue. | Ensure all connections are secure. Try a different USB power source. If the issue persists, the charger or battery may be faulty. |
| Short run time | Battery not fully charged; battery degradation; high power consumption by device. | Ensure battery is fully charged (green light solid). If battery is old, consider replacement. Check vehicle for excessive power draw. |
| Battery gets hot during charging/use | Normal heat generation; overcharging/discharging; internal short circuit. | Slight warmth is normal. If excessively hot, disconnect immediately. Ensure charger is compatible. Discontinue use if battery swells, smokes, or catches fire. |
Safety Warning: Lithium-ion batteries can pose a fire hazard if improperly used or damaged. Always use the provided charger and ensure connections are correct. Do not use damaged or swollen batteries. Supervise charging and keep batteries away from flammable materials.
Specifications
- Brand: Blomiky
- Model: SM-3P 7.4V 900mAh Li-ion Battery
- Battery Type: Li-ion (Lithium-ion)
- Voltage: 7.4 Volts (2S)
- Capacity: 900mAh - 1100mAh (actual range)
- Connector: SM-3P Black 3-Pin Plug
- Battery Dimensions (L*W*H): 54mm * 36.8mm * 18.9mm (2.12" * 1.45" * 0.74")
- Battery Weight: Approximately 60 grams (2.12 ounces)
- Charger Input: DC 5V 2A
- Charger Output: 7.4V 500mA
- Built-in Protection: Yes (protection board)
Warranty and Support
For any questions, concerns, or support regarding your Blomiky battery and charger, please contact the seller directly through the platform where the purchase was made. Provide your order details for efficient assistance.
For general information about Blomiky products, you may visit the official Blomiky store on Amazon: Blomiky Store.