2S 4A 7.4V (3.7V x 2) 18650 Li-ion Battery Protection BMS Module

29.00 (inc. GST)

  • 2S 4A Li-ion Battery Protection Module (for 3.7V 18650 cells)

  • Suitable for high-integration and compact battery pack designs

  • Supports 2-series (2S) 18650 lithium-ion battery configuration

  • Long service life and stable performance

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  • 5 Days Return Policy!
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SKU: RY1447 Category:
Description

🔋 Reliable 2S 4A BMS for 18650 Lithium Battery Packs

Protect your 7.4V (2S) 18650 Li-ion battery pack with this high-efficiency 2S 4A Battery Management System (BMS) module. Designed for safe and stable battery operation, this compact protection board prevents overcharge, over-discharge, overload, and short circuits, ensuring longer battery life and reliable performance.

Ideal for DIY battery packs, robotics projects, RC vehicles, portable electronics, solar lights, and backup power systems.


⭐ Key Features

  • Supports 2S 18650 Li-ion Batteries (7.4V Nominal)

  • Maximum Continuous Current: 4A

  • ✅ Overcharge Protection

  • ✅ Over-discharge Protection

  • ✅ Short Circuit Protection

  • ✅ Overcurrent / Overload Protection

  • ✅ High Integration & Compact Size

  • ✅ Improves Battery Life & Safety

  • ✅ Easy to Integrate in DIY Projects


⚙️ Technical Specifications

Parameter Value
Battery Type 18650 Li-ion
Configuration 2S (2 Cells in Series)
Nominal Voltage 7.4V (3.7V × 2)
Max Continuous Current 4A
Overcharge Detection ~4.25V ±0.05V
Over-discharge Detection ~2.5V ±0.1V
Protection Functions Overcharge, Over-discharge, Overcurrent, Short Circuit
Board Type Lithium Battery Protection PCB

🔧 Applications

This 2S 4A BMS module is suitable for:

  • DIY Lithium Battery Packs

  • Robotics Projects

  • RC Cars & Drones

  • Portable LED Lights

  • Solar Battery Packs

  • Power Banks

  • IoT & Embedded Systems

Perfect for electronics hobbyists, students, and professional developers.


📦 Package Includes

  • 1 × 2S 4A 18650 Li-ion BMS Protection Modules


💡 Why Use a BMS?

Without a BMS, lithium batteries can become unsafe due to overcharging or deep discharge. This protection board:

  • Extends battery lifespan

  • Prevents overheating

  • Ensures stable output

  • Protects connected devices


🚀 Ideal for Electronics Stores & DIY Enthusiasts

If you are building lithium battery packs for robotics, embedded systems, or DIY electronics, this 2S 4A BMS module is a must-have safety component.

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Return & Refund

Refund and Returns Policy

Our refund and returns policy lasts 10 days from the date of delivery. If 10 days have passed since your purchase, we can’t offer you a full refund or exchange.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Several types of goods are exempt from being returned.

  • Gift cards
  • Downloadable software products

To complete your return, we require a receipt or proof of purchase.

Please do not send your purchase back to the manufacturer.

Partial Refund

There are certain situations where only partial refunds are granted (if applicable)
- Any item not in its original condition, is damaged or missing parts for reasons not due to our error.
- Any item that is returned more than 10 days after delivery

Refunds

Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.

If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.

Late or missing refunds

If you haven’t received a refund yet, first check your bank account again.

Then contact your credit card company, it may take some time before your refund is officially posted.

Next contact your bank. There is often some processing time before a refund is posted.

If you’ve done all of this and you still have not received your refund yet, please contact us at [email protected].

Late or missing refunds (if applicable)

Once refund is initiated you will get the refund initiated mail. after that wait for minimum 3 days.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next, contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at [email protected]

Sale Items

Only regular priced items may be refunded. Sale items cannot be refunded.

Exchanges

We only replace items if they are defective or damaged(during shipping) please take the photo if package is tempered or damage at the time of receiving goods . If you need to exchange it for the same item, send us an email at [email protected] and send your item to: M/S Rytronics Enterprises, Plot GH-05B Greater noida west Sector, 201306 (UP).

Shipping returns

To return your product, you should mail your product to: M/S Rytronics Enterprises, Plot GH-05B, Greater noida west Sector, 201306 (UP).

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.

Depending on where you live, the time it may take for your exchanged product to reach you may vary.

If you are returning more items value more then Rs 2000, you may consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.

Need help?

Contact us at [email protected] for questions related to refunds and returns.