PRODUCT DESCRIPTION
A battery protection board is an integrated circuit board that protects rechargeable batteries (mainly lithium batteries) from damage. Lithium batteries have material properties that make them vulnerable to overcharging, over-discharging, short-circuiting, and extreme temperature charging. Therefore, lithium batteries always have a protective plate with a sampling resistor and a current fuse attached to their components.
This 3S BMS board is an example of a battery protection board that can connect 3 x 18650 batteries to form a battery pack. The battery pack can provide up to 15V DC output at 20A current, which is suitable for heavy-duty applications.
Note: Product Image May vary from actual product in terms of Model name and labels printed
Features:
- Overcharging and Over Discharging Protection
- Short circuit protection: Yes
- Applicable assembly: Nominal 4.5V Batteries / 3 strings.
Specifications:
| Model | HXYP-3S-BM20 |
| Charging voltage(V) | 12.6V-13.6V |
| Over-Discharge recovery voltage | 3±0.05V |
| Over Discharge Delay Time(ms) | 150 |
| Maximum Working Current(A) | 20 |
| Maximum Peak Current(A) | 30 |
| Length (mm) | 65 |
| Width (mm) | 47 |
| Height (mm) | 10 |
| Weight (gm) | 12 |
Package Includes:
1 x 3S 20A 18650 Lithium Battery Protection Board
3s 20A 18650 Lithium Battery Protection Board Overview
The 3s 20A 18650 Lithium Battery Protection Board is a compact BMS module designed to safeguard a 3-cell 18650 Li-ion pack. It provides overcharge, over-discharge and short-circuit protection while supporting up to 20A continuous current for applications requiring reliable 12.6V output.
Key Features of 3s 20A 18650 Lithium Battery Protection Board
- Overcharge protection: limits cell voltage to safe levels and cuts off charging above 4.2V per cell
- Over-discharge protection: prevents cell voltage dropping below 2.5V to avoid damage
- Short-circuit and overcurrent protection up to 20A continuous discharge
- Cell balancing function via sampling resistors for uniform charge across three cells
- Supports 3×18650 cells in series (nominal 11.1V, max 12.6V) for up to 15V DC output
- Genuine board shipped fast from Zbotic across India
Applications and Use Cases
- DIY battery packs for remote-controlled vehicles, drones and e-bikes
- Backup power modules for LED lighting and small inverters
- Portable energy storage in camping power banks and portable fridges
- Solar charge controllers and home energy storage prototypes
- Power source for robotics, Arduino and Raspberry Pi projects
How to Use 3s 20A 18650 Lithium Battery Protection Board
Connect three 18650 cells in series to the B- terminal and B1, B2, B3 balance leads as marked. Attach your charger to P+ and P–, then connect your load to the same P+ and P– terminals. Ensure all connections observe correct polarity and use proper insulation on solder joints.
Why Buy from Zbotic?
- Genuine Products: All items sourced from authorized distributors
- Fast Shipping: Orders ship within 24 hours with tracking (non backordered products)
- Free Shipping: Free delivery on qualifying orders
- COD Available: Cash on Delivery, UPI, cards, net banking
- Technical Support: Expert help for setup and troubleshooting
- Easy Returns: Hassle-free replacement for defective products
Frequently Asked Questions
Which battery configuration does this board support?
This board is designed for a 3S configuration using three 18650 Li-ion cells in series, delivering a nominal pack voltage of 11.1V (max 12.6V when fully charged).
What is the maximum continuous discharge current?
The protection board supports up to 20A continuous discharge. For short-term peaks you can draw slightly more, but staying within 20A ensures long-term reliability.
Does this board provide cell balancing?
Yes, it uses integrated sampling resistors on the B1, B2 and B3 leads to balance cell voltages during charging, ensuring each 18650 cell maintains uniform capacity and extends pack life.
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| Current Rating | 20A |
|---|---|
| SKU | AI3181 |
| Weight | 0.01495 kg |
| Availability | In Stock |
Applications & Use Cases
The 3s 20A 18650 Lithium Battery Protection Board is a versatile battery protection board used across a wide range of applications including lithium battery pack protection, power bank builds, e-bike battery management, solar energy storage, and UPS systems.
Common use cases:
- Building a custom lithium battery pack
- Adding overcharge/overdischarge protection
- Creating a DIY power bank
This product is ideal for battery pack builders and power electronics engineers.
Technical Tip: BMS boards prevent overcharge, overdischarge, overcurrent, and short circuit. Match cell count (S) and max current rating to your battery pack.
Shipping & Delivery
- Free shipping on orders above ₹999 across India
- Dispatched within 1-3 business days
- Expected delivery: 3-7 business days depending on location
- Secure packaging to ensure safe transit of electronic components
