BiXPower Smart 12.6V 4A Lithium-Ion Battery Charger with 4 LED Charge Indicators
Higher-output 4A lithium-ion charging with intelligent 3-stage control, four LED charging indicators, automatic shutoff, and interchangeable DC connector options.
The BiXPower ACC-12V4A-LED is an intelligent AC battery charger designed for compatible 10.8V and 11.1V nominal lithium-ion battery packs using three lithium-ion cells connected in series (3S).
It delivers a maximum charging voltage of 12.6V DC and a maximum charging current of 4A, providing up to 50.4W rated DC charging output.
The charger's microcontroller-controlled charging system automatically manages the charging process, while four LED indicators display approximate charging progress from 25% to 100%.
The standard output connector is a 5.5 x 2.5mm male DC barrel plug. Optional BiXPower C-series connector tips allow the plug to be changed to other sizes, including 5.5 x 2.1mm and 4.0 x 1.7mm, for compatible batteries.
Important: Dedicated Lithium-Ion Battery Charger
This charger is designed for compatible 3S lithium-ion batteries requiring 12.6V charging. It is not a general-purpose 12V DC power adapter. Do not use it with batteries requiring a different charging voltage or chemistry.
Key Features and Benefits
- Higher 4A Charging Current: Up to 4A output for compatible lithium-ion battery packs.
- 12.6V Maximum Charging Voltage: Designed for standard 10.8V / 11.1V nominal 3S lithium-ion batteries.
- Intelligent 3-Stage Charging: MCU-controlled charging process with pre-charge, main charging, and charging completion.
- Automatic Charging Termination: Automatically cuts off charging output at the end of the charging process.
- Four LED Charging Indicators: Displays approximate charging progress in 25% increments.
- Multiple Safety Protections: Overvoltage, short-circuit, reverse-polarity, and overpower protection.
- Universal AC Input: Supports 100V–240V AC, 50/60Hz.
- Standard 5.5 x 2.5mm Connector: Male DC barrel output plug.
- Optional C-Series Connector Tips: Change to 5.5 x 2.1mm, 4.0 x 1.7mm, and other compatible connector sizes.
- Convenient Charging Status Display: Easily monitor approximate charging progress without separate measuring equipment.
Intelligent Microcontroller-Controlled Charging
The ACC-12V4A-LED uses an internal microcontroller (MCU) to manage the charging process automatically.
Its intelligent three-stage charging process is designed to charge compatible lithium-ion battery packs efficiently while managing charging current and completion.
| Charging Stage |
Description |
| 1. Pre-Charge |
Uses reduced charging current during the initial charging stage when required. |
| 2. Main Charging |
Provides controlled charging current up to the maximum 4A rating. |
| 3. Charging Completion |
Automatically terminates charging output at the end of the charging process. |
The controlled charging process helps avoid unnecessary continued charging after the charger determines that its charging cycle is complete.
Four LED Indicators Show Charging Progress
The charger features four LED lights that provide a convenient visual indication of approximate battery charging progress.
| LED Display |
Approximate Charging Progress |
| 1 LED |
25% |
| 2 LEDs |
50% |
| 3 LEDs |
75% |
| 4 LEDs |
100% |
The four LEDs indicate approximate charging progress rather than an exact measurement of battery capacity.
LED Indicator Functions and Fault Warnings
- Power Indicator On: AC input power is connected.
- 1–4 Charging LEDs: Display approximate charging progress.
- All Charging LEDs Flashing: Indicates a possible reversed battery connection or output short circuit.
- All Charging LEDs Off: May indicate that no battery is connected.
If all four charging LEDs flash simultaneously, disconnect the charger and check the battery connection, connector polarity, and output cable before attempting to charge again.
Designed for 10.8V / 11.1V Lithium-Ion Battery Packs
A typical rechargeable lithium-ion cell has a nominal voltage of approximately 3.6V or 3.7V and a maximum charging voltage of 4.2V.
When three cells are connected in series, the battery is commonly called a 3S lithium-ion battery. Its nominal voltage is approximately 10.8V or 11.1V, while its fully charged voltage is 12.6V.
3S Lithium-Ion Charging Specifications
- Battery configuration: 3 cells in series (3S)
- Nominal voltage: 10.8V / 11.1V
- Maximum voltage per cell: 4.2V
- Maximum charging voltage: 12.6V
- Maximum charging current: 4A
- Maximum rated output power: 50.4W
The charger is intended for compatible lithium-ion battery packs with approximately 100–300Wh capacity (about 10–30Ah), provided the battery is rated to accept 4A charging current.
It may be suitable for 3S4P, 3S5P, 3S6P, and other 3S battery configurations when the battery's maximum charging current, charging connector, polarity, and battery management system are compatible.
Important: Battery capacity and cell configuration alone do not guarantee compatibility. Always verify the battery manufacturer's charging specifications.
Standard 5.5 x 2.5mm Male DC Charging Connector
The ACC-12V4A-LED comes with a 5.5mm outer diameter x 2.5mm inner diameter male DC barrel connector.
- Outer Diameter (OD): 5.5mm
- Inner Diameter (ID): 2.5mm
- Connector Type: Male DC barrel plug with hollow center
- Maximum Charging Voltage: 12.6V DC
- Maximum Charging Current: 4A
Confirm the charging-port polarity of your battery before connecting the charger. The connector size alone does not establish electrical compatibility.
Optional BiXPower C-Series Connector Tips
The ACC-12V4A-LED supports optional BiXPower C-Series connector tips that fit over the standard 5.5 x 2.5mm male output connector and provide a different male connector size.
This allows customers to use the same charger with other compatible lithium-ion battery packs that have different charging-port dimensions.
| Connector |
Male Output Size |
Availability |
| Standard |
5.5 x 2.5mm |
Included |
| C3 |
5.5 x 2.1mm |
Optional |
| C25 |
4.0 x 1.7mm |
Optional |
C3 Connector Tip – Converts to 5.5 x 2.1mm
The BiXPower C3 connector tip converts the charger's standard 5.5 x 2.5mm male barrel plug into a 5.5 x 2.1mm male DC connector.
This is useful for compatible 3S lithium-ion battery packs that require a 5.5 x 2.1mm charging connector.
View BiXPower C3 Connector Tip
C25 Connector Tip – Converts to 4.0 x 1.7mm
The BiXPower C25 connector tip converts the charger's standard 5.5 x 2.5mm male barrel plug into a 4.0 x 1.7mm male DC connector.
This provides an additional connection option for compatible batteries with 4.0 x 1.7mm charging inputs.
View BiXPower C25 Connector Tip
Important Connector Compatibility Information
Optional C3 and C25 connector tips change the physical connector size only. They do not change the charger's 12.6V maximum charging voltage or 4A maximum output current.
Before use, verify the battery's required charging voltage, maximum charging current, connector polarity, and connector dimensions. Make sure the selected connector tip is rated for the required charging current.
Optional connector tips are sold separately.
Built-In Safety Protection Features
The smart charger includes several protection functions intended to support safe charging of compatible lithium-ion battery packs.
- Overvoltage Protection: Helps protect against excessive output voltage.
- Short-Circuit Protection: Helps protect the charger if an output short circuit occurs.
- Reverse-Polarity Protection: Detects certain incorrect battery polarity connections.
- Overpower Protection: Helps protect against excessive power demand.
- Automatic Charging Termination: Stops charging output when the charging cycle is complete.
These features do not eliminate the need to confirm battery compatibility or follow safe lithium-ion battery charging practices.
Technical Specifications
| Product Model |
ACC-12V4A-LED |
| Product Type |
Smart Lithium-Ion Battery AC Charger |
| Battery Chemistry |
Rechargeable Lithium-Ion (3S) |
| Nominal Battery Voltage |
10.8V / 11.1V |
| AC Input Voltage |
100V–240V AC, 50/60Hz |
| Maximum Charging Voltage |
12.6V DC |
| Maximum Charging Current |
4A |
| Maximum Rated DC Output Power |
50.4W |
| Charging Method |
MCU-Controlled 3-Stage Charging |
| Charging Termination |
Automatic Output Cutoff at Charging Completion |
| Charging Status Display |
Four LED Indicators, Approx. 25%–100% |
| Standard DC Output Connector |
5.5 x 2.5mm Male Barrel Plug |
| Optional Connector Tips |
C3 (5.5 x 2.1mm), C25 (4.0 x 1.7mm) |
| Recommended Battery Capacity |
Approx. 100–300Wh (10–30Ah), subject to compatibility |
| Weight |
350g (Approx. 12.3 oz) |
| Safety Protections |
Overvoltage, Short Circuit, Reverse Polarity, Overpower |
How to Charge Your Lithium-Ion Battery
-
Check Battery Compatibility: Confirm that the battery is a compatible 3S lithium-ion pack requiring 12.6V charging and accepting up to 4A charging current.
-
Select the Correct Connector: Use the standard 5.5 x 2.5mm connector or an optional compatible C-series tip.
-
Connect the Battery: Insert the DC charging plug into the battery's designated charging input.
-
Connect AC Power: Connect the charger to a suitable 100V–240V AC outlet using its AC power cord.
-
Monitor Charging: The four LED lights display approximate charging progress.
-
Charging Completion: The smart charging system automatically terminates charging output at the end of the charging cycle.
-
Disconnect: Follow the battery manufacturer's instructions for disconnecting the charger after charging.
Frequently Asked Questions
What type of batteries can this charger charge?
This charger is designed for compatible 10.8V / 11.1V nominal 3S lithium-ion battery packs that accept 12.6V charging at up to 4A.
Is this charger more powerful than a 12.6V 3A charger?
Yes. Its maximum charging current is 4A instead of 3A, providing approximately 33% greater maximum charging current. Actual charging time depends on battery capacity, charging-current limits, and battery condition.
What do the four LED lights mean?
They show approximate charging progress in 25% increments. Four illuminated charging LEDs indicate approximately 100% charging progress.
Does this charger automatically stop charging?
Yes. Its microcontroller-controlled charging system automatically cuts off charging output when the charging cycle is complete.
What is the standard connector size?
The standard output is a 5.5 x 2.5mm male DC barrel connector.
Can I change the output connector to 5.5 x 2.1mm?
Yes. The optional BiXPower C3 connector tip converts the standard 5.5 x 2.5mm output to a 5.5 x 2.1mm male connector.
Can I change the output connector to 4.0 x 1.7mm?
Yes. The optional BiXPower C25 connector tip converts the standard 5.5 x 2.5mm output to a 4.0 x 1.7mm male connector.
Do C-series connector tips change the charging voltage?
No. They change the physical connector size only. The charger remains rated for 12.6V maximum charging voltage and 4A maximum charging current.
Can I use this charger for a 3S4P or 3S6P lithium-ion battery?
Yes, if the battery is designed for 12.6V charging at up to 4A and has compatible connector polarity and battery protection circuitry.
Can this charger charge LiFePO4 or lead-acid batteries?
No. This charger is designed for compatible standard 3S lithium-ion batteries, not LiFePO4 or lead-acid batteries.
Can this charger be used as a regular 12V power adapter?
No. It is a dedicated lithium-ion battery charger with intelligent charging control and automatic charging termination.
Can I use this charger internationally?
The charger accepts 100V–240V AC, 50/60Hz input. A compatible AC power cord or wall plug adapter may be required depending on the country.
Package Contents
- 1 x BiXPower ACC-12V4A-LED Smart 12.6V 4A Lithium-Ion Battery Charger
- 1 x AC Power Cord
Optional C-series connector tips and lithium-ion batteries are sold separately.
Higher-Output Smart Charging with Flexible Connector Options
The BiXPower ACC-12V4A-LED combines up to 4A charging current, intelligent three-stage charging, automatic charging termination, four LED progress indicators, and multiple safety protection features. Its standard 5.5 x 2.5mm output connector can be adapted using optional BiXPower C-series tips, making it a versatile charging solution for compatible 10.8V / 11.1V lithium-ion battery packs.
