29.4V 2.5A AC Charger for 24V / 25.2V Lithium-Ion Batteries

The BiXPower ACC-24235 is a dedicated AC battery charger designed for compatible 24V / 25.2V (7S) lithium-ion rechargeable battery packs. It provides controlled charging with a maximum output voltage of 29.4V and a maximum charging current of 2.5A.

Unlike a conventional laptop power adapter, this charger is designed to manage the battery charging process using a constant-current / constant-voltage (CC/CV) charging profile.

BiXPower ACC-24235 AC lithium-ion battery charger

Key Features

• Designed for 7S lithium-ion batteries: Suitable for compatible 24V / 25.2V nominal battery packs requiring a 29.4V charging voltage.
• Controlled charging current: Limits charging current to a maximum of 2.5A.
• CC/CV charging method: Helps provide appropriate charging voltage and current throughout the charging process.
• LED charging status: Red indicates charging current above 300mA; green indicates current at or below 300mA.
• Universal AC input: Accepts 100–240V AC, suitable for use with compatible power cords in many countries.
• Compact design: Convenient for home, office, workshop, and other indoor charging applications.

The ACC-24235 is intended for compatible 7-series-cell lithium-ion battery packs that require a 29.4V final charging voltage and permit a charging current of up to 2.5A.

Compatible BiXPower battery models may include:

• BiXPower BX2488
• BiXPower BX2487
• BiXPower BX2493
• BiXPower BX2499
• Other compatible 24V / 25.2V 7S lithium-ion battery packs

Output Connector

The charger is equipped with a DC barrel output connector with the following dimensions:

• Outside diameter: 5.5mm
• Inside diameter: 2.5mm

Confirm the required polarity from the charger label and battery specifications before connecting. Matching connector dimensions alone does not guarantee compatibility.

LED Charging Status

The ACC-24235 includes an LED indicator to help identify charging status.

A green LED by itself does not always confirm a fully charged battery. It may also appear when the charger is disconnected or the battery is not accepting charging current. Follow the battery manufacturer's instructions to confirm charging completion.

Battery Charger vs. Laptop AC Power Adapter

A lithium-ion battery charger may look very similar to a laptop AC-to-DC power adapter. Both convert household AC power into DC power, but their output behavior and intended applications are different.

Lithium-Ion Battery Charger: Controlled Current and Voltage

A properly designed lithium-ion battery charger controls both charging current and charging voltage according to the battery's charging requirements.

For most conventional lithium-ion battery packs, charging uses a constant-current / constant-voltage (CC/CV) process:

1. Constant-current stage: The charger supplies a controlled charging current, up to its rated maximum. Its output voltage rises as the battery voltage increases.
2. Constant-voltage stage: When the battery approaches its specified final charging voltage, the charger maintains that voltage while charging current gradually decreases.
3. Charge completion: When charging current falls below the charger's termination threshold, charging is considered complete.

The charger's rated output current is its maximum controlled charging current, not necessarily the current delivered throughout the entire charging cycle.

Laptop AC-to-DC Power Adapter: Constant Voltage

A conventional laptop AC power adapter is designed to provide a constant DC output voltage, such as 19V, 20V, or 24V.

Its output current varies according to the connected device's power demand, up to the adapter's rated output capacity.

For example, a 24V 5A power adapter maintains approximately 24V while a connected device may draw 1A, 2A, or 5A depending on its operating needs. The 5A rating is the adapter's maximum output current, not a fixed output current.

Comparison: Battery Charger vs. Power Adapter

Why You Should Not Use a Regular Laptop Adapter to Charge an Unprotected Battery Pack

Lithium-ion battery cells have relatively low internal resistance. When connected directly to a constant-voltage power source without proper charging control, they may draw excessive current.

A conventional AC power adapter is generally designed to maintain its rated voltage while supplying whatever current the load requires, within the adapter's capabilities.

Without an appropriate battery charging controller, excessive charging current may cause:

• Battery overheating
• Accelerated battery cell degradation
• Damage to battery cells
• Power adapter overload or shutdown
• Damage to the adapter or charging connections
• In severe cases, thermal runaway or fire

When Can a Laptop Power Adapter Charge a Lithium Battery?

Some rechargeable battery packs include a built-in charging controller that manages the voltage and current delivered to the battery cells.

For example, certain BiXPower battery models, including the BP90, BP100, BP220, and BP300, incorporate internal charging control and can accept compatible external DC power sources.

For these batteries, a suitable constant-voltage AC-to-DC power adapter may be used for charging, provided that:

• The adapter output voltage is within the battery's specified charging input range.
• The adapter provides sufficient output power for the battery's charging requirements.
• The connector size and polarity are correct.
• The battery model explicitly supports charging from that type of DC power source.

The external adapter must still be compatible with the battery's input requirements. A higher-wattage adapter does not automatically force additional current into a battery with properly designed internal charging control.

Why Charging Current Matters for Battery Life

Lithium-ion battery cells generally benefit from charging within their manufacturer-specified current limits. Moderate charging currents often help reduce heat and battery stress.

Faster charging can be convenient, but higher charging currents may increase cell temperature and accelerate long-term capacity degradation.

Charging beyond the battery cells' permitted current range may cause overheating, premature aging, or permanent damage.

Benefits of Moderate Charging Current

• Helps reduce heat generation
• May extend battery cycle life
• Reduces charging stress on battery cells
• Supports reliable long-term performance

The ACC-24235 provides a maximum charging current of 2.5A, making it suitable for compatible battery packs whose recommended charging current allows this level.

Charging time depends on battery capacity, state of charge, temperature, charging efficiency, and the duration of the constant-voltage charging stage.

Technical Specifications

How to Charge Your Lithium-Ion Battery

1. Verify that the battery requires a 29.4V CC/CV charger and supports charging current up to 2.5A.
2. Check the battery charging port, connector size, and polarity.
3. Connect the charger DC output to the compatible battery charging port.
4. Connect the charger to a suitable 100–240V AC power outlet.
5. Observe the charging status indicator.
6. When charging is complete, disconnect the charger according to the battery manufacturer's instructions.

Charge batteries in a dry, ventilated area away from flammable materials. Do not charge damaged, swollen, overheated, or otherwise abnormal batteries.

Frequently Asked Questions

Package Contents

• 1 x BiXPower ACC-24235 AC Battery Charger
• 1 x Compatible AC Power Cord