7S 24V 25A BMS – Complete protection for your 18650 Li-Ion battery pack
Whether you are building an 18650 battery pack for an electric bike, an off-grid power system, or a custom DIY project, a reliable Battery Management System (BMS) is essential. Without a properly sized BMS, cells can become unbalanced, overcharged, or over-discharged, leading to premature degradation and safety risks. The 7S 24V 25A BMS module is designed to solve this by monitoring each cell individually, providing automatic voltage balancing, and cutting power instantly if any irregularities are detected.
Note: Compatible exclusively with 3.7V/cell Li-Ion chemistry (e.g., 18650). Not recommended for LiFePO4 or LiPo cells without prior verification of voltage thresholds.
Why choose this model? (Key Advantages):
- 5-Level Simultaneous Protection — Integrated monitoring for overvoltage, over-discharge, overcurrent, short-circuit, and high temperature, all working in parallel for maximum safety.
- Automatic Balancing at 4.15V ± 0.025V — Ensures weaker cells are brought up to parity, equalising voltages passively during every charge cycle.
- 60A Peak Current — Designed to handle the high inrush current required by electric motors during startup, preventing nuisance tripping.
- Low Standby Consumption ≤30μA — Minimal power draw when idle, ensuring your battery retains its charge during storage.
- Low Internal Resistance ≤20mΩ — Minimises energy loss and heat generation, even during high-current discharge.
- Pre-installed Thermal Sensor — Automatic cut-off at 50°C (charging) and 70°C (discharging) with no extra components required.
- Compact Design (60 × 33 × 7 mm) — Fits easily into most DIY battery enclosures or projects with limited space.
Performance and Technical Details
This module features a Common Port architecture, meaning the same B-/P- connection handles both charging and discharging. This simplifies your wiring significantly compared to separate-port models. The 25A continuous discharge current is ideal for 24V electric motors, small inverters, or off-grid solar setups, while the 60A peak current handles startup surges with ease. With precise 4.25V overcharge and 2.7V over-discharge thresholds per cell, your battery chemistry is protected against irreversible damage.
| Parameter | Value / Detail |
|---|---|
| Model | 7S 24V 25A BMS |
| Cell Configuration | 7S (7 × 3.7V = 25.9V nominal) |
| Continuous Discharge Current | 25A |
| Peak Discharge Current | 60A |
| Max Charging Current | 20A |
| Overcharge Voltage | 4.25V ± 0.025V / cell |
| Over-discharge Voltage | 2.7V ± 0.08V / cell |
| Balancing Voltage | 4.15V ± 0.025V |
| Balancing Current | 40mA |
| Charging Thermal Protection | Cut-off at 50°C |
| Discharging Thermal Protection | Cut-off at 70°C |
| Standby Consumption | ≤30μA |
| Internal Resistance | ≤20mΩ |
| Dimensions | 60 × 33 × 7 mm |
| Connection Method | Common Port |
| Compatible Chemistry | Li-Ion 3.7V/cell (e.g., 18650) |
Package Contents
- 1 × 7S 24V 25A BMS Protection Module
- 1 × Pre-installed Temperature Sensor
- 40 cm Connection Wiring
Frequently Asked Questions
Does this work with any 18650 Li-Ion cell regardless of capacity?
Yes. Compatibility is based on the nominal voltage (3.7V/cell), not the mAh capacity. You can use 2000mAh, 2500mAh, or 3000mAh cells; the BMS functions identically, while your cell capacity simply determines your total runtime.
Can I use this for a 24V e-bike or scooter?
Absolutely. This is a common application for this module. The 25A continuous rating supports standard 24V motors, and the 60A peak handles startup surges without triggering the protection. Always verify your motor’s peak current draw before installation.
What does ‘Common Port’ mean and how do I wire it?
It means the same B- and P- terminals are used for both the charger and the load, eliminating the need for separate connectors. This makes wiring much simpler, though you must be careful to observe correct polarity. Reversing the connections can damage the internal MOSFETs.
Do I need to install the temperature sensor separately?
No. The sensor comes pre-installed from the factory and is ready to use. It monitors the temperature of the board and surrounding cells, triggering an automatic shut-off at 50°C during charging and 70°C during discharge.
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