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Details about  12V 14.6V 30A LiFePo4 Battery BMS LFP PCM SMT System 4S eBike battery Pack / DIY

12V 14.6V 30A LiFePo4 Battery BMS LFP PCM SMT System 4S eBike battery Pack / DIY

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SuPower Battery
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Item information

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3 available / 170 sold
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US $22.99
Approximately £15.37(including postage)
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More than 98% sold
11 inquiries
US $4.80 (approx. £3.21) Economy Int'l Shipping | See details
International items may be subject to customs processing and additional charges.  help icon for delivery - opens a layer
Item location:
Shanghai, China
Posts to:
Worldwide See exclusions
Please allow additional time if international delivery is subject to customs processing.
International postage and import charges paid to Pitney Bowes Inc. Learn More- opens in a new window or tab
14 days money back, buyer pays return postage See details
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Last updated on  10 Apr, 2015 07:55:46 BST  View all revisions

Item specifics

New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging is ... Read moreabout the condition

SuPower Battery

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12V 14.6V 30A  4S LiFePo4 Battery Pack BMS for E-bike

4S 30A lithium LiFePO4 Battery protection board.


Technical Parameters:
Balanced current: 60mA (VCELL = 3.90V when)
Balanced for: 3.50 ± 0.05 V

Over-charged Protection: 3.85 ± 0.05 V

Over-discharged Protection: 2.1 ± 0.05 V

Over-charged delay: 1 ± 0.5S
Over-charged release: 3.80 ± 0.05 V
Over-discharged threshold: 2.10 ± 0.05 S
Over-discharged delay: 100 ± 50mS
Over-current Protecton: 30 A

Operating Current: 20A

Static power consumption: less than 100uA

Short-circuit protection function: disconnect the load from the recovery.

Size: 82mm * 52mm

The main functions: Over-charged, Over-discharged protection, short circuit protection, over-current protection, with Balancing function.


The board have balancing function. So you may see a balance connector with 4 wires, below chart shows how to connect the wires onto 4 batteries to realize balancing and protection.

  • The Positive output on Battery Pack (12V + )could connecting to charger positive pole (charger +)
  • Battery Pack (12V -) connecting with B- on board
  • Chip board P- connecting to Charger Negative Pole (charger -)
  • Chip board P- could be Negative output for charger, motor, controller
  • Battery B+ could be Positive output for charger, motor, controller

Interface Definition:


1,  The charging port and the discharge port of the board are the same Positive port.

    “B-“ for negative Pole of the battery pack, “P-“ is negative pole for both discharging and charging.


2,  “B-“, “N-“ “P-“ welding pad are through-hole port, hole diameter of 3.5 mm; 

     You could use solder iron to weld the wires through the hole port

      Every charging port for battery are the DC needle seat forms output.

     “N-“ with no wiring when charging and discharging are in the same port;

3,  First connect the “P-“ , “B-“ to the battery pack, then re-check with the battery voltages,

     Then connect the 4 wires onto the batteries, Do not connect in wrong ordering, or it will burn out the board.



If you made wrong connection and reverse the board that will cause smoke, please check with every wire to be sure you are doing correct connection. 

check all the wires voltage with orderly, start from B- , and see if it increasing from 3.2V, like:

( wires with voltage )

 1   -  2  -   3  -   4  

3V - 6V - 9V - 12V 


Check every voltage on the wire step by step before plug in the connector.  C

heck every wire and see if the orderly are correct. Because if any of the wire get a wrong order, it will get burnt. Smoke shows board already get burnt for protecting the battery being damage by wrong connection 

For DIY assembling. Please make sure you are capable to do the assembling before ordering! If you dont know how to do the connection, DONT ORDER IT!





  • The BMS only use for new and consistent high drain batteries. 
  • Do not use for battery packs that mix with new & half-used, or mix with different brand battery cells.
  • Do not use for used and imbalance battery cells.
  • Do not use for batteries with fake capacity.
  • Battery not including, the auction is for BMS only.


 photo conditionandterms.jpg


  • We don't do combine shipping! Kindly check with separate shipping cost on "Shipping and Payments" page.
  • All shipments will have a tracking number to trace with.
  • Lithium Battery is Sensitive for air shipping, it is slower than normal items.
Reference shipping time:


Standard Shipping Time

Delay if Backlogs


20-25 Days

30-36 Days


28-30 Days

38-45 Days


28-32 Days

38-48 Days


28-30 Days

34-35 Days

  South American

38-45 Days

55-65 Days


28-35 Days

40-45 Days


30-36 Days

45-68 Days


40-52 Days

58-68 Days


30-38 Days

48-55 Days

  Other Countries

30-38 Days

48-50 Days

* Delays may occur on and around holiday seasons and when backlogs are coursed by unforeseeable events and actions by customs.

  • If you do not receive the package over 30 days, kindly contact us and we will solve the problem for you.
  • This is economy International shipping from China, delays and backlogs may occur.
  • If you can't wait for long delivery, there's optional "Expedited Int'l Shipping" for selection or please order from local seller.
After-Sale Support
  • Every item has been tested by professional equipment before shipment.
  • Please Read Detail Item Description before order.
  • We do not responsible for quality problem caused by incorrect use, using wrong charger, refitting or welding.
  • We do not advise to mix fresh and half-used battery as this may kill the fresh battery in short time.
  • If the items are "Dead on Arrival", You may need to help for sending us more details.
  • Defected Information like Battery Voltage, Charging & discharging Status, Pictures are necessary in finding out the problem.
  • Communication is very important. Please trust us! We are happy to work with you in solving the problem.
Welding Service
  • We offer free-charge Welding Service!
  • You may send message to us if you need solder the tabs or Series / Parallel - Connected spot welding.
  • Its better if you could send us a drawing or picture by mail.
  • Remember to leave the message again on transaction by ordering that we will not miss the information.

Thank you for shopping with us.
Dispute and Escalated case can not help in solving the problem.
We hope you could contact us first before opening a case.
Remember: We are always here for help!


Questions and answers about this item

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Seller assumes all responsibility for this listing.

Postage and packaging

Item location: Shanghai, China
Postage to: Worldwide
Excludes: Alaska/Hawaii, US Protectorates, APO/FPO, Africa, Central America and Caribbean, Middle East, South America, American Samoa, Cook Islands, Fiji, French Polynesia, Guam, Kiribati, Marshall Islands, Micronesia, Nauru, New Caledonia, Niue, Palau, Papua New Guinea, Solomon Islands, Tonga, Tuvalu, Vanuatu, Wallis and Futuna, Western Samoa, Bermuda, Greenland, Mexico, Saint Pierre and Miquelon, Albania, Andorra, Austria, Bosnia and Herzegovina, Gibraltar, Greece, Guernsey, Hungary, Iceland, Jersey, Liechtenstein, Moldova, Monaco, Montenegro, San Marino, Serbia, Svalbard and Jan Mayen, Vatican City State, Brunei Darussalam, Cambodia, Hong Kong, Indonesia, Laos, Macau, Philippines, Taiwan, Vietnam, Afghanistan, Armenia, Azerbaijan Republic, Bangladesh, Bhutan, China, Georgia, India, Kyrgyzstan, Maldives, Mongolia, Nepal, Pakistan, Sri Lanka, PO Box
Domestic dispatch time
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Returns policy

After receiving the item, cancel the purchase within
Refund will be given as
14 days
Money back
The buyer is responsible for return postage costs.
Return policy details
return shipping will be paid by buyer
Most purchases from business sellers are protected by the Consumer Contract Regulations 2013 which give you the right to cancel the purchase within 14 days after the day you receive the item. Find out more about your rights as a buyer - opens in a new window or tab and exceptions - opens in a new window or tab.

Payment details

Payment method Preferred/Accepted  
Credit or debit card through PayPal

Immediate payment required for this item.

Immediate payment of US $22.99 is required.
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