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Product Details


  • 3S 12.6V 40A lithium battery protection board (comes with recovery function-AUTO Recovery)
  • Scope: Nominal voltage of 3.7V lithium battery (including 18650,26650, polymer lithium battery)
  • Product Size: 41 * 55 * 3.4mm (Enhanced Version), 41 * 60 * 3.4mm (Balanced version)
  • Product weight: 8.8g (enhanced version), 9.8g (balanced version)
  • Charging voltage: 12.6V – 13.6V
  • Continuous discharge current (upper limit): 40A (if the cooling environment is not good, please reduce the load current )
  • Continuous charge current (upper limit): 20A

Enhanced version: Suitable for electric drill with starting current below 80A and power below 130W .(without balanced function)

Balanced version: Suitable for electric drill with starting current below 80A and power below 170W .(with balanced charging function)

Note 1: To successful starting, the drill requires three 15C-20C power batteries, or six 10C-15C power batteries (ordinary 18650 battery can not start the drill!!).

Note 2: When you wiring 0V, 4.2V, 8.4V, 12.6V, please do it strictly according to the wiring diagram. Do not deliberately make it a short circuit.

Note 3: When the battery is charging,the “430” resistance heating is normal,it means the balance circuit is working.If the “430” resistance is also heating without charging,please check if the wrong wire is connected.

Note 4: Do not use a mix of good battery and poor battery,please make sure each battery is the same in capacity and internal resistance.
For some of the poor basis of electronic customers to explain: balanced charge is only auxiliary functions, try not to put a good battery and poor battery mixed together! 3 sets of battery capacity / resistance closer to the better! (2 good battery +1 Poor battery use effect = 3 poor battery use effect).




Shipping & Payment


We are proud to offer international shipping services that currently operate in over 200 countries and islands world wide. Nothing means more to us than bringing our customers great value and service. We will continue to grow to meet the needs of all our customers, delivering a service beyond all expectation anywhere in the world.

How do you ship packages?

Packages from our warehouse in China will be shipped by ePacket or EMS depending on the weight and size of the product. Packages shipped from our US warehouse are shipped through USPS.

Do you ship worldwide?

Yes. We provide free shipping to over 200 countries around the world. However, there are some locations we are unable to ship to. If you happen to be located in one of those countries we will contact you.

What about customs?

We are not responsible for any custom fees once the items have shipped. By purchasing our products, you consent that one or more packages may be shipped to you and may get custom fees when they arrive to your country.

How long does shipping take?

Shipping time varies by location. These are our estimates:
Location *Estimated Shipping Time
United States 10-30 Business days
Canada, Europe 10-30 Business days
Australia, New Zealand 10-30 Business days
Central & South America 15-30 Business days
Asia 10-20 Business days
Africa 15-45 Business days
*This doesn’t include our 2-5 day processing time.

Do you provide tracking information?

Yes, you will receive an email once your order ships that contains your tracking information. If you haven’t received tracking info within 5 days, please contact us.

My tracking says “no information available at the moment”.

For some shipping companies, it takes 2-5 business days for the tracking information to update on the system. If your order was placed more than 5 business days ago and there is still no information on your tracking number, please contact us.

Will my items be sent in one package?

For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you've specified combined shipping.

If you have any other questions, please contact us and we will do our best to help you out.


Order cancellation

All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.


Your satisfaction is our #1 priority. Therefore, you can request a refund or reshipment for ordered products if:

  • If you did not receive the product within the guaranteed time( 45 days not including 2-5 day processing) you can request a refund or a reshipment.
  • If you received the wrong item you can request a refund or a reshipment.
  • If you do not want the product you’ve received you may request a refund but you must return the item at your expense and the item must be unused.

We do not issue the refund if:

  • Your order did not arrive due to factors within your control (i.e. providing the wrong shipping address)
  • Your order did not arrive due to exceptional circumstances outside the control of Ovalco Mart (i.e. not cleared by customs, delayed by a natural disaster).
  • Other exceptional circumstances outside the control of https://ovalcomart.com

*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on Contact Us page

If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.


If for any reason you would like to exchange your product, perhaps for a different size in clothing. You must contact us first and we will guide you through the steps.

Please do not send your purchase back to us unless we authorise you to do so.

Customer Reviews
5 (49 reviews)
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26 Jun 2020

I received the boards, neatly packed in a pouty bag and additionally wrapped with a navel. Came quickly, I take the 2nd time from this store. The first board successfully works in a lithium screwdriver. Delivery was almost молниеносной ;) now there are boards, and the rest of the component has not left China yet;)

25 Jun 2020

Each board in a separate sealed anti-static bag. All OK

3 Jun 2020

The order received, packed like not bad, but there is a gap on the package, but the fee seems not damaged. The batteries have not yet come, I can not check, I'll check back...

2 Jun 2020

all is good as usuall ;) Work fine in screwdriver

27 May 2020

The package has reached. Packing is good. Delivery about month.

23 May 2020

I recommend everyone. Excellent lithium battery controller!

19 May 2020

Sent quickly, arrived quickly, packed well. Until I collect the battery, I'll quit later. The whole looks. Recommend the store!

14 May 2020

Delivery of the free free free and and free of the free free of the free free of the free free of the free free of the free free of the free of the free free of the free free of the free free of the free free of the free free of the free free of the free free of the free free of the free free of the free free of the free of the free of the free of the free of the free of the free of the free of the free of the free and Spin good. The fee of the SHPC did not spill memory 0.,4.2, 8.4, 12. Recommend it.

9 May 2020

The item corresponds to the description made qualitatively store recommend five stars

7 May 2020

Delivery as part of the national parcel about three weeks. BMS quality are satisfied. We order not the first time. )))

3 May 2020

Good quality. Arrived in Vienna in 32 days

1 May 2020

Everything is normal, came quickly, and works only in the way, something quality and necessary. + received a refund of 10% of the amount when ordering through this service Ali (tchk) pub/3a7xck details on the photo!

27 Apr 2020

The parcel arrived in Moscow region in 2.5 weeks, in the general parcel. Immediately put in the screwdriver everything works well. I'll order another one.

26 Apr 2020

Order 03.04 came to MSK in mid-April, cost 211.83, before that, there was an order from another store and he pressed this fee, this is the one that in the photo of the product, very powerful fast bird

24 Apr 2020

It works. After KZ recovers without charging connection

23 Apr 2020

Very fast delivery! Only 17 days in St. Petersburg. Thrown in the mailbox. The fee is working, made qualitatively. Installed it in interscol's refurbished screwdriver battery. All right, you can order from this store.

21 Apr 2020

The order was in one package with the other, with more detailed consideration of chips and cracks not found, packed as necessary. How to supply and test add the review.

17 Apr 2020

It was 1 month. I'll try. If there is a negative experience, I will necessarily add. Seller recommend.

13 Apr 2020

Great fees! Soon they will be introduced into the body of Akim. Recommend!

8 Apr 2020

With the old versions there were problems, then in defense earlier they left, then because of the lack of mosphets flew away from overheating. It's all right here.

1 Apr 2020

Hello, it's on time, packed perfectly! There are videos: https://youtu (Point) be/uoxmzcv _ 1ve

23 Mar 2020

Quality is good, one and a half months delivery

23 Mar 2020

Quickly delivered packed perfectly in work until checked

16 Mar 2020

The Balancer arrived, much faster than the batteries. I hope it'll be okay when I get together. Bought for the refurbishment of "Shurik" under the Li-ion.

13 Mar 2020

Everything has come)))

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3S 40A Li-ion Lithium Battery Charger Lipo Cell Module PCB BMS Protection Board For Drill Motor 12.6V with Balance

49 Reviews
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