Introduction
This manual provides essential information for the safe and efficient operation of your MIEKLALE 8+2 Bays Smart Universal Battery Charger (Model S8). Please read these instructions carefully before use and retain them for future reference.
Safety Information
- Do not attempt to charge non-rechargeable batteries. This can lead to explosion, rupture, or leakage, causing personal injury or property damage.
- Ensure correct battery polarity (+/-) when inserting batteries into the charger slots. Incorrect insertion can damage the charger and batteries.
- Do not disassemble, modify, or repair the charger. Contact customer support for assistance.
- Avoid exposing the charger to water, high humidity, or extreme temperatures.
- Keep the charger away from flammable materials.
- Unplug the charger from the power source when not in use or before cleaning.
- This charger is designed for indoor use only.
- It cannot charge 1.5V Li-ion AA AAA batteries.
Package Contents
Verify that all items are present in your package:
- 1 x MIEKLALE 8+2 Slot Smart Battery Charger
- 1 x 12V/4A Power Adapter
- 1 x Car Power Cord
- 1 x Instruction Manual

Image: Contents of the MIEKLALE S8 Smart Universal Battery Charger package.
Product Overview
The MIEKLALE S8 is a versatile 8+2 bay smart universal battery charger designed to charge a wide range of rechargeable batteries. It features an LCD display for real-time charging information and multiple safety protections.

Image: Front view of the MIEKLALE S8 Smart Universal Battery Charger.
Key Features:
- 8+2 Bays: 8 main slots for cylindrical batteries and 2 dedicated slots for 9V batteries.
- Smart LCD Display: Displays battery voltage (V), current (mA), charging time (h), battery capacity (mAh), energy percentage (%), and internal resistance (mΩ).
- Fast Charging: Supports up to 2A current simultaneously across multiple channels with five selectable current levels.
- Universal Compatibility: Compatible with Li-ion, LiFePO4, RCR123, 18650, 26650, 10440, 14500, 9V, NiMH, NiCd, AAA, and AA batteries.
- Multiple Protection Functions: Includes overcharge, over-discharge, short circuit, reverse connection protection, and intelligent bad battery identification.
- Versatile Power Input: Can be powered via the included 12V/4A power adapter or car power cord.

Image: Detailed breakdown of the LCD display features.
Setup
- Unpack the Charger: Carefully remove the charger and all accessories from the packaging.
- Choose Power Source:
- For home/office use: Connect the 12V/4A power adapter to the charger's input port and then plug it into a standard wall outlet.
- For car use: Connect the car power cord to the charger's input port and then plug it into your vehicle's 12V power socket.
- Power On: The LCD display will illuminate, indicating the charger is ready for use.
Operating Instructions
Battery Compatibility
The MIEKLALE S8 charger supports a wide range of rechargeable battery types and sizes:
| Battery Type | Voltage Range | Compatible Sizes | Notes |
|---|---|---|---|
| Li-ion | 3.7V-4.2V | 26650, 21700, 18650, 18490, 18350, 17670, 17500, 16340 (RCR123), 14500, 10440 | Max Length 72mm |
| Ni-MH | 1.2V/9V | AA, AAA, SC, C | Max Length 72mm |
| Ni-CD | 1.2V/9V | AA, AAA, SC, C | Max Length 72mm |
| IMR | 4.35V | Suitable | |
| LiFePO4 | 3.65V | Suitable |
Note: The charger cannot charge 1.5V Li-ion AA/AAA batteries. Ensure your batteries are rechargeable and within the specified length of 72mm.

Image: Battery length compatibility guide.
Charging Process
- Insert Batteries: Gently slide rechargeable batteries into the desired charging slots, observing correct polarity. The charger will automatically detect the battery type and begin charging.
- Monitor LCD Display: The LCD screen will show real-time charging status for each inserted battery, including voltage, current, charging time, and percentage.
- Charging Completion: The charger will automatically stop charging when batteries are full. The display will indicate 100% charge.
Charging Current Selection
The charger offers five levels of charging current. To adjust the current for a specific channel:
- Press the 'CURRENT' button to cycle through the available current options (e.g., 300mA, 500mA, 700mA, 1000mA, 2000mA).
- Use the 'PREV' and 'NEXT' buttons to select the desired charging channel.
- Press the 'MODE' button to confirm the current selection for the chosen channel.

Image: Fast charging capabilities of the MIEKLALE S8 charger.
Car Charging
The included car power cord allows for convenient charging on the go. Simply connect the charger to your car's 12V power outlet. This feature is ideal for travel or situations where a wall outlet is not available.

Image: MIEKLALE S8 charger in a car charging setup.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the charger's exterior. Do not use abrasive cleaners or solvents.
- Storage: Store the charger in a cool, dry place away from direct sunlight and moisture when not in use.
- Inspection: Periodically inspect the power cords and charger for any signs of damage. Do not use if damaged.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Charger not powering on | No power supply or loose connection | Ensure power adapter/car cord is securely connected and plugged into a live outlet/socket. |
| Battery not charging | Incorrect battery type, improper insertion, or faulty battery | Verify battery is rechargeable and compatible. Reinsert battery with correct polarity. The charger can identify bad batteries. |
| LCD display shows error/null | Faulty battery or internal issue | Remove and reinsert the battery. If the issue persists, the battery may be faulty. If all slots show an error, contact support. |
| Slow charging | Low current setting | Adjust the charging current to a higher setting using the 'CURRENT' button. |
Specifications
- Brand: MIEKLALE
- Model Number: S8
- Color: BLACK
- Product Dimensions: 7.6"D x 5.5"W x 1.3"H
- Number of Ports: 10 (8 main slots + 2 9V slots)
- Input Voltage: 12 Volts
- Output Voltage: 4.2 Volts
- Current Rating: 4 Amps
- Amperage: 4 Amps
- Connector Type Used on Cable: Barrel Jack
Warranty
This MIEKLALE product comes with a 2-Year Manufacturer Warranty. Please retain your proof of purchase for warranty claims. The warranty covers defects in materials and workmanship under normal use. It does not cover damage caused by misuse, accident, unauthorized modification, or improper installation.
Support
For technical assistance, troubleshooting, or warranty inquiries, please contact MIEKLALE customer support through the retailer where the product was purchased or visit the official MIEKLALE website for contact information.