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- 3S 20A BMS 18650 Lithium Battery Protection Board 11.1V 12V 12.6V 3S 20A BMS 18650 Lithium Battery Protection Board 11.1V 12V 12.6V






3S 20A BMS 18650 Lithium Battery Protection Board 11.1V 12V 12.6V
- Description
- Return & Refund Policy
- Reviews
✅ Product Description:
3S 20A BMS 18650 Lithium Battery Protection Board 11.1V 12V 12.6V with Balance
The 3S 20A 18650 Lithium Battery Protection Board is designed to protect and manage 3-cell lithium battery packs (11.1V to 12.6V) used in applications such as electric drills, LED lighting, sprayers, and small inverters. Featuring auto recovery and built-in balance function, this board ensures extended battery life and safe performance.
This module supports a continuous discharge and charge current of up to 20A, and integrates 10 low-resistance MOSFETs for efficient thermal and electrical handling. It's compact and ideal for DIY battery packs using 18650, 26650, or lithium polymer cells.
Features:
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Supports 3S lithium battery packs (11.1V / 12V / 12.6V)
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Built-in balance function with 100mA balanced current
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Continuous charge/discharge current: 20A
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Integrated 10 MOS tubes for load efficiency
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Auto recovery function
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Ideal for electric drills with starting current < 80A and power < 135W
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Compact size: 59mm x 20mm x 4mm
Specifications:
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Battery Type: 3S (3 cells in series)
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Overcharge Detection Voltage: 4.25 ± 0.025V
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Over-discharge Voltage Range: 2.3 ~ 3.0 ± 0.05V
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Continuous Charge Current: 20A
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Operating Temperature: -40°C to +50°C
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Dimensions: 59mm x 20mm x 4mm
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Weight: 4g
Application Notes:
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Not suitable with standard 18650 cells for high-drain tools—use high C-rate cells only
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Strictly follow wiring sequence (0V, 4.2V, 8.4V, 12.6V)
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For motor applications, add a non-polar capacitor (25V+, 10uF–100uF) across terminals to prevent damage from voltage spikes
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Ensure all battery groups are fully charged and balanced before use
Package Includes:
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1 x 3S 20A 18650 Lithium Battery Protection Board 11.1V 12V 12.6V
Note: Image shown is for representation only. Actual product may vary in design.
RETURN POLICY
Hallmark PCB Services (circuitcomps – www.circuitcomps.com) reserves the right to accept products for return at its discretion. Eligibility of a product for return will be expressly mentioned on the Website page for that particular product. Only sealed and undamaged items may be returned. Any expenses incurred for the process of returning a product back to Hallmark PCB Services will be borne by the buyer and Hallmark PCB Services reserves the right to recover such cost from the buyer by any means at its disposal if the buyer does not bear the aforementioned expense.
ORDER CANCELLATION POLICY
Before Order has been Shipped
In case, customer want to cancel the order, before the order has been shipped, customer needs to pay flat 5% order cancellation charge. Circuitcomps will refund the amount after charging the order cancellation fees to the customer. Generally, the refund is initiated with 2 Business days. The time taken for the amount to get credited to customer’s original payment method, depends on payment gateway, and varies from 1-7 days.
After order has been shipped
In a case where the order has been shipped and customer would like to cancel the order, then as the order would have left our premises, we cannot cancel the order. But the customer should not accept the order, and ask the courier to return to sender, without opening the parcel. The refund will be initiated within 2 business days after the parcel has been received back at our office. In such scenarios, the customer would have to pay 5% order cancellation charge, and the forward shipping charge, and return shipping charge. We will initiate the refund to customer, the balance after charging the customer for order cancellation fees, forward shipping charge, and return shipping charge. If the customer has opened the parcel, then the returned items will be verified, and the refund will be initiated after verification within 3 business days.
REFUND AND EXCHANGE POLICY
We want you to be completely satisfied with your purchase. If, for any reason, you are not happy with your products, please read our refund and exchange policy to understand the options available to you.
DAMAGED OR DEFECTIVE ITEMS
- Notification: If you receive a damaged or defective item, please contact us immediately by email and return the product within 7 days.
- Resolution: Once you report the issue, our team will work with you to resolve it promptly. Depending on the nature of the issue, we may provide a replacement. Verification of the damage or defect will be required. This process will be done within 7 days.
- Replacement: Once we receive damaged product we will process and deliver the replacement or exchange product within 6 to 7 days.
CONTACT INFORMATION
For assistance, please reach out to us at: circuitcomps@gmail.com