M4AC

Introduction

Thank you for purchasing the M4AC balance charger. Please read this manual carefully before use.

Key Points

• ? Tips
• ⚠️ Important
• ? Information

Further information

To ensure you have the best experience with this product, please scan the QR code below to stay up to date with news, information, and firmware updates for your charger. Or visit www.toolkitrc.com.

The QR code links to: Applications, Video teaching, Product purchase.

Safety

1. The M4AC allows input voltage of AC100-240V. Do not change or modify the power cable and ensure the charger is only connected to a suitable AC power outlet.
2. Do not use this product in environments of heat, humidity, flammable liquids, or explosive gas.
3. Please do not use this charger without supervision. Never leave charging batteries unattended.
4. When not using this product, please unplug the input power.
5. When using the charging function, please set a current that matches the battery. Do not set an excessive current for charging to avoid damage to the battery. Check the guidelines of your battery's manufacturer for correct charging instructions.

Product description

The M4AC is an AC balance charger. It is small in size, yet high in power density. It features an IPS wide viewing angle display and charging accuracy as low as 5mV.

• Charge and balance management of LiPo, LiHV, LiFe & Lion 1-4S batteries.
• Wide voltage input AC 100-240V, 30W.
• Charging current: Maximum 2.5A @MAX 25W.
• Lithium battery cut-off voltage can be set (TVC function).
• Battery voltage can be manually calibrated.
• Charging accuracy: <0.005V.
• Balance current: 200mA.
• 1.54 inch, IPS full viewing angle display.
• High resolution 240*240 pixels.

M4AC Layout

Front View:

The front of the charger features a display screen, a Type/Current button (long press for Type, short press for Current), heat dissipation vents, a balance port, and an output main port.

Back View:

The back of the charger features heat dissipation vents and an AC input port.

Quick start

1. Connect the M4AC to a suitable 100-240V AC power outlet.
2. The display shows the boot logo and stays for 2 seconds.
3. After booting up, the screen enters the main interface.
4. Short press the [Type/Current] button to release the locked state.
5. Long press the [Type/Current] button to select the cut-off voltage to be charged (battery type).
6. Short press the [Type/Current] button to select the current to be charged.
7. When the output main port and the balance port voltage match, it will automatically start charging.

Tips: Every time you turn on the charger, you need to press the button once to release the lock. This safety feature is to prevent incorrect selection of battery type and current.

Charging settings

After the power is connected and the charger is unlocked, the screen will display the following interface:

The display shows: 000:00 Standby, battery voltages (4.20V, 4.35V, 3.85V, 3.60V), charging current (2.0A), total voltage (16.0V), individual cell voltages (1 4.000V, 2 4.000V, 3 4.000V, 4 4.000V), accumulated capacity (888mAh), and charge percentage (80%).

1. Battery type setting

Long press the [Type/Current] key to select battery cut-off voltage (battery type). The display will show options corresponding to different battery types.

Important:

1. Choosing the wrong battery type to charge may damage the battery, the charger, and cause fire hazards. Please choose carefully.
2. Please do not use this product to charge a battery that is not marked with the battery type.

Vocabulary explanation:

• LiPo: Lithium polymer battery, with a nominal voltage of 3.70V and 4.20V when fully charged.
• LiHV: High-voltage lithium battery, with a nominal voltage of 3.85V and 4.35V when fully charged.
• LiFe: Iron-lithium battery, with a nominal voltage of 3.30V and 3.60V when fully charged.
• Lion: Lithium-ion battery, with a nominal voltage of 3.60V and 4.10V when fully charged.

2. Current setting

Short press the [Type/Current] key to select the charging current. The current can be selected from 4 levels: 0.5A, 1.0A, 2.0A, 2.5A.

Tips: When selecting the current, it is recommended to use a charging rate of 1C-2C. For example, for a 1000mAh battery, it is recommended to use 1.0A-2.0A for charging, which will effectively improve the cycle life of the battery. Always check the battery manufacturer's guidelines and charging instructions before charging.

Start charging

After setting the battery voltage and current, connect the battery. After the charger detects that the voltage between the main port and the balance port matches, it will automatically start charging.

The display will show: 000:10 Charging.

Display content description:

• 000:10: This charging time.
• Charging: Charger working status.
• 4.20V: The selected rechargeable battery type.
• 4.35V, 3.85V, 3.60V: Other types of rechargeable batteries.
• 16.0V: Current rechargeable battery voltage.
• 1.56A: Current charging current.
• P: Current limit sign.
• P: Power current limit, T: High temperature current limit, F: The battery or one of the cells is full.
• 888mAh: Accumulated capacity that has been charged.
• 1 4.000V: The first battery voltage, this cell is not balancing.
• 2 4.001V: The second battery voltage, this cell is slowly balancing.
• 3 4.002V: The third battery voltage, this cell is slowly balancing.
• 4 4.005V: The fourth battery voltage, this cell is quickly balancing.

Tips: When charging a 1S battery, the battery voltage needs to be provided to the balance port at the same time, so that the charger can recognize and start charging.

Terminal voltage setting and manual calibration

Before connecting to the power supply, press and hold the [Type/Current] key to enter the calibration mode, as shown below:

Calibration Screen:

Terminal voltage: 4.20V, 4.35V, 3.85V, 3.60V

Calibration voltage: 16.80V

Cell voltages: 1 4.200V, 2 4.200V, 3 4.200V, 4 4.200V

DEFAULT

Terminal voltage: The terminal voltage after the battery is fully charged. Each battery allows modification of the voltage range by plus or minus 10mV.

Calibration voltage: Battery calibration voltage. If the cell voltage readings appear to be incorrect, use a high-quality voltage meter to measure the actual voltage, and then set this value to be the same as the meter to achieve voltage calibration.

DEFAULT: Restore to factory default.

Specification