The 7S 24V 10A Li-ion 18650 Battery Charge Board with Balance Function is a battery management and protection board designed for 7-series (7S) lithium-ion battery packs made from 18650 cells. BDTronics offers this compact 7S 24V BMS for battery packs used in electric toys, portable equipment, DIY power systems, robotics, and other 24V-class lithium-ion applications.

This BMS provides essential battery protection functions including short-circuit protection, temperature protection, and cell balancing. The balance function helps maintain more consistent voltage levels between the individual cell groups in a 7S battery pack, supporting more reliable battery pack operation and helping reduce cell imbalance over repeated charge and discharge cycles.

Features:

• Designed for 7S lithium-ion battery packs

• Suitable for 24V-class Li-ion 18650 battery packs

• 10A rated current version

• Built-in cell balancing function

• Short-circuit protection

• Temperature protection

• Helps protect lithium-ion cells from abnormal operating conditions

• Supports more consistent voltage between series-connected cell groups

• Compact SMD circuit-board design

• Lightweight construction

• Suitable for DIY 18650 battery pack assembly

• Useful for electric toys, robotics, portable equipment, and custom battery systems

Specifications:

7S 24V Battery Configuration:

A 7S battery pack consists of seven lithium-ion cell groups connected in series. When using 18650 cells, multiple cells can be connected in parallel within each group to achieve the required capacity and current capability.

The BMS monitors and manages the individual series cell groups and provides protection functions for the completed battery pack. The actual battery capacity depends on the number and capacity of cells connected in parallel in each of the seven groups.

A 7S lithium-ion pack is commonly referred to as a 24V battery pack, although its actual voltage varies with the state of charge. The exact charging voltage must match the battery chemistry and the BMS design.

Balance Function:

The built-in balance function helps reduce voltage differences between the seven series-connected cell groups during charging. Cell imbalance can cause one group to reach its voltage limit before the others, reducing the usable capacity of the overall battery pack.

Balancing helps keep the individual series groups closer in voltage, which can improve pack consistency and utilization of the connected cells.

Protection Functions:

The BMS provides several important protection functions:

• Short-Circuit Protection: Helps disconnect or protect the battery pack when an abnormal short-circuit condition is detected.

• Temperature Protection: Provides protection against specified abnormal temperature conditions.

• Cell Voltage Management: Monitors the series battery groups to help prevent unsafe operating conditions.

• Cell Balancing: Helps maintain better voltage consistency between series-connected cell groups.

Applications:

• 7S 18650 lithium-ion battery packs

• 24V-class rechargeable battery systems

• Electric toys

• DIY battery packs

• Robotics projects

• Portable electronic equipment

• Battery-powered tools and equipment

• Custom DC power systems

• Small electric vehicles and mobility projects where the electrical requirements match

• IoT and embedded battery systems

• Backup power projects

• Rechargeable lithium-ion power packs

Installation Notes:

Connect the BMS according to its 7S wiring configuration and terminal markings. The seven series cell groups must be connected in the correct order so that the BMS can accurately monitor each cell group.

Use cells of the same chemistry, type, capacity, and similar condition when building a battery pack. Cells should be properly matched before assembling them into parallel groups.

The BMS is a protection and management circuit; it does not make an incorrectly configured or damaged battery pack safe. Use a charger specifically suitable for a 7S lithium-ion battery pack and compatible with the BMS and cell specifications.

Do not exceed the board's specified current capability. Actual allowable current also depends on PCB construction, wiring, connectors, battery cells, cooling, and operating conditions.

Important Notes:

The product is described as a 7S 24V Li-ion BMS. A 7S lithium-ion pack has a nominal voltage in the 20V-class range and reaches a higher voltage when fully charged, so the charger voltage must be selected according to the specific lithium-ion cell chemistry and the BMS's required charging voltage.

The stated 10A rating should not automatically be interpreted as a guaranteed continuous 10A output under every installation condition. PCB temperature, wiring, cell capability, enclosure, and cooling can affect practical current handling.

The supplied listing states an operating temperature range of -40°C to 80°C. This should be understood as the stated product specification and does not mean the connected lithium-ion cells can safely operate across that entire range.

Package Includes:

• 1 × 7S 24V 10A Li-ion 18650 Battery Management System with Balance and Protection Function

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