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Lithium Li-ion 18650 3.7V 4.2V Battery Charger Board DC-DC Step Up Boost Module Integrated Circuits

33 reviews
100% of buyers enjoyed this product! 174 orders

$1.66 $1.51

5101 in stock

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Easy returns and refunds
Free shipping worldwide

100% Brand New and High Quality
Can be used for multimeter, converted to lithium battery charging
For example: VIN+Port input 5V solar panels, BAT+port can output 4.2V to charger 3.7V 18650 battery
Note: The OUT+Port can output an adjustable voltage.
Input voltage: 4.5-8V DC
Output voltage: 4.3-27V DC (Continuously adjustable)
Charging voltage: 4.2V DC
Charging current: Max. 1A
Discharging current: Max. 2A
Size: 3.3×2.3cm/1.3×0.91″
Quantity: 1 Pc
Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid.
Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!
Package Contents:
1 x Step Up Boost Module







Supply Voltage

3.7V 4.2V

Brand Name



Voltage Regulator



Model Number

DC-DC Step Up Boost Module

Operating Temperature


Dissipation Power




Shipping and delivery

We are proud to offer international shipping services that currently operate in over 200 countries and islands worldwide. 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 have specified combined shipping.

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

Refunds & returns policy

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:

  • You do not receive them within the guaranteed time (45 days not including 2-5 day processing)
  • You receive the wrong item
  • You do not want the product you have received (but you must return the item at your expense and the item must be unused)

We do not issue the refund if:

  • Your order does not arrive due to factors within your control (e.g. providing the wrong shipping address)
  • Your order does not arrive due to exceptional circumstances outside our control (e.g. not cleared by customs, delayed by a natural disaster)
  • Other exceptional circumstances outside the control of

*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 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.

Real customer reviews

33 reviews
100% of buyers enjoyed this product!
5 stars
( 32 )
4 stars
( 1 )
3 stars
( 0 )
2 stars
( 0 )
1 star
( 0 )
  1. F***E

    perfect and quick delivery!

  2. M***v

    Good board.

  3. Customer

    Thank you for the goods, everything is fine

  4. V***v

    I got the fees while everything is ok.

  5. Customer

    all ok

  6. A***h


  7. D***n

    Thank you !!!

  8. Customer

    The board is interesting, but not yet tested

  9. O***k

    Delivered for 19 days. Everything is good.

  10. V***v

    Payment received. everything is fine. thanks to the store.

  11. S***n

    Shipping 47 days, it could be better! Price is perfect! Packaging good!

  12. S***n


  13. T***n

    NOT testet yet

  14. Customer

    Good product. Thanks

  15. M***v

    Good thing! The voltage is adjustable from 4 to 27. On one li-ion, you can make uninterrupted power for a variety of low-power consumers.

  16. Customer

    Not tested yet.

  17. D***h

    Everything corresponds to the description, the order is satisfied, the delivery is a month.

  18. V***v

    For a very long time. Three months

  19. Customer

    thank you

  20. Customer

    Came quickly. Everything is fine! Thank you)

  21. M***a


  22. I***v

    Tuned to 5 volts. The most interesting is to check the low voltage cut-off on the battery. They write that no. If not, it’s very bad. Although the chip is the same as on the regulators with the compartment. There are sites for soldering, i think it can be possible to solder that to turn on the cut-off on low voltage.

  23. P***y

    Already in which time i order from this store-everything is fine in all positions

  24. I***l

    Sent quickly, came in three weeks, track to the border. The product is very interesting, until the hands to apply, took to transfer multimeters to power from lithium

  25. T***n


  26. M***k

    Item matches description and works fine. Arrived in a month to Ukraine in a good package.

  27. V***a


  28. D***a

    Delivery about a month without track. Everything works.

  29. P***y

    All ok. Went long without tracking. I did not check in the work. The store is responsive. I recommend.

  30. Customer

    excellent product, not tested yet

  31. S***a

    Used by self-made 9V battery that can be charged. Since it can be boosted to 9 V in combination with the Lipo battery, you can make your own non-disposable battery.

  32. A***v

    The goods did not come, but the store returned the money without waiting for arbitration.

  33. N***a

    Quality is good, works fine!

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