Includes all taxes
3 strings of 12.6V 20A lithium battery protection board
Scope of application: Lithium batteries with nominal voltages of 3.6V and 3.7V (including 18650, 26650, and polymer lithium batteries)
Product size: 59 * 20 * 3.4mm
Product weight: 4.3g
Charging voltage: 12.6V-13.0V
Continuous discharge current (upper limit): 20A (if the heat dissipation environment is poor, please reduce the load current for use)
Continuous charging current (upper limit): 10A
Standard version: Suitable for electric drills with starting current below 40A and power below 65W.
Note 1: To successfully start the drill, 3 15C-20C power batteries or 6 10C-15C power batteries are required (regular 18650 cannot start the drill!!!);
Note 2: Strictly follow the wiring diagram for 0V, 4.2V, 8.4V, and 12.6V, and do not intentionally short circuit.
Note 3: When carrying loads with brush motors, a capacitor (10uF-1000uF) must be connected in parallel to the positive and negative terminals of the motor to prevent the reverse peak voltage generated by the motor from interfering with the protection board or breaking down the MOS transistor.
Note 4: When connecting 3 groups of batteries in series, please ensure that the voltage of each group of batteries is the same. If they are not the same, please fully charge each group of batteries separately before using them in series...
The group of batteries with a faster voltage drop during discharge testing is a poor battery.
For some customers with poor electronic foundation, it is important not to mix good and poor batteries together for use! The closer the capacity/internal resistance of the three sets of batteries, the better! The usage effect of 2 good batteries+1 poor battery=the usage effect of 3 poor batteries.






Payment Policy – BILLIONS BIRDS
At BILLIONS BIRDS, we are committed to providing a safe, secure, and seamless payment experience for our customers.
1. Accepted Payment Methods
We accept the following payment options:
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All payments must be completed in full at the time of purchase.
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Once your payment has been successfully processed, you will receive an order confirmation email containing your purchase details.
5. Failed or Declined Payments
If your payment is declined, please verify your billing information or contact your bank. Orders will only be processed after successful payment confirmation.
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BILLIONS BIRDS reserves the right to cancel or refuse any order if fraud or unauthorised activity is suspected.
Delivery Policy – BILLIONS BIRDS
At BILLIONS BIRDS, we are dedicated to delivering your orders safely and efficiently.
1. Order Processing
All orders are processed within 1–3 business days after payment confirmation. Orders are not processed or shipped on weekends or public holidays.
2. Shipping Times
Estimated delivery times vary depending on your location:
Domestic Shipping: 3–7 business days
International Shipping: 7–15 business days
Please note that delivery times are estimates and may vary due to customs procedures, carrier delays, weather conditions, or other unforeseen circumstances.
3. Shipping Costs
Shipping fees are calculated at checkout based on your location and selected shipping method. Any customs duties, taxes, or import fees are the customer's responsibility.
4. Tracking Information
Once your order has been shipped, you will receive a confirmation email with tracking details (if available) so you can monitor your package.
5. Delivery Issues
If your order is delayed, lost, or arrives damaged, please contact us within 7 days of the expected delivery date. We will work with the shipping carrier to resolve the issue as quickly as possible.
6. Incorrect Shipping Information
Customers are responsible for providing accurate shipping details at checkout. BILLIONS BIRDS is not responsible for orders shipped to incorrect addresses provided by the customer.
Refund Policy – BILLIONS BIRDS
At BILLIONS BIRDS, customer satisfaction is our top priority. If you are not completely satisfied with your purchase, we’re here to help.
1. Return Eligibility
You may request a return within 14 days of receiving your order. To qualify for a return:
The item must be unused, unworn, and in the same condition as received.
The item must be in its original packaging.
Proof of purchase (order confirmation or receipt) is required.
Certain items may not be eligible for return, including clearance items, gift cards, or personalised/custom products.
2. Non-Refundable Items
The following items are non-refundable:
Final sale or discounted items
Gift cards
Items damaged due to misuse, negligence, or improper care
3. Return Process
To initiate a return, please contact our customer support team with your order number and reason for return. If your return is approved, you will receive instructions for returning the item.
Unless the item is defective or incorrect, customers are responsible for return shipping costs.
4. Refund Processing
Once we receive and inspect your returned item:
We will notify you of the approval or rejection of your refund.
If approved, the refund will be issued to your original payment method within 5–10 business days.
Please note that banks or payment providers may require additional time to process refunds.
5. Damaged or Incorrect Items
If you receive a damaged, defective, or incorrect item, please contact us within 7 days of delivery and provide clear photos of the product and packaging. We will arrange a replacement or full refund at no additional cost.
6. Late or Missing Refunds
If you have not received your refund:
Check your bank account again.
Contact your credit card company or payment provider.
If the issue persists, don't hesitate to contact our support team for assistance.
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