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The 4S 15A 18650 Lithium Battery Protection Board is an essential BMS (Battery Management System) module designed to protect 4-cell lithium battery packs from common electrical faults. It provides reliable safeguards against overcharging, over-discharging, short circuits, and excessive current, ensuring safe and efficient battery operation.
Engineered for 4 × 3.7V 18650 lithium cells in series, the 4S 15A 18650 Lithium Battery Protection Board supports a nominal voltage of 14.8V and delivers up to 15A continuous current. Its integrated safety circuitry includes an over-discharge recovery function and precise delay timing to improve pack reliability and lifespan.
Compact and lightweight at only 35 × 35 mm and 6 grams, the 4S 15A 18650 Lithium Battery Protection Board is perfect for custom battery packs used in RC models, DIY energy storage, e-bikes, and portable devices. High-efficiency MOSFETs and a low-resistance design allow stable operation even under demanding loads.
Whether you are assembling new battery packs or upgrading an existing system, this 4S 15A 18650 Lithium Battery Protection Board ensures your lithium cells are well-protected for safe long-term use.
🔧 Key Features
- Supports 4-cell (4S) 18650 lithium battery configurations
- Overcharge, over-discharge, and short circuit protection
- Charge cut-off voltage: 16.8V ± 0.05V
- Discharge recovery function at ~2.5V per cell
- High current handling: 15A continuous, 10A typical working current
- Ultra-low quiescent current (<8µA) for extended standby life
📐 Technical Specifications
| Product Name | 4S 15A 18650 Lithium Battery Protection Board |
| Configuration | 4 Series (4S) 18650 Li-ion Cells |
| Nominal Voltage | 14.8V |
| Charge Cut-off | 16.8V |
| Continuous Current | 15A Rated (10A Typical) |
| Peak Current | Up to 15A |
| Over-discharge Recovery | 2.5V ± 0.05V per cell |
| Delay Time | Approx. 144 ms |
| Static Consumption | Less than 8µA |
| Internal Resistance | ≤ 4 mΩ |
| Dimensions | 35 × 35 mm |
| Weight | 6 g |
📌 Applications
- Custom lithium battery packs for DIY projects
- RC models, drones, and robotics
- E-bikes and portable electronics
- Energy storage and power backup systems
- General 18650 battery pack assembly
💡 Why Choose This Product?
The 4S 15A 18650 Lithium Battery Protection Board delivers advanced safety features in a compact design. It ensures lithium cells remain within safe voltage and current limits, extending battery life while reducing the risk of damage or failure. With its strong protective circuitry, it’s the ideal choice for hobbyists, engineers, and DIY enthusiasts.
📦 Package Includes
- 1 × 4S 15A 18650 Lithium Battery Protection Board
⚠️ Note
Product image may differ slightly from the actual item in terms of labels, printing, or model markings.
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