---
product_id: 66726321
title: "12Pcs 5V Boost Step Up Step-up Transformers Power Supply Module Lithium Battery Charge Protection Board for DIY Charger,with LED Display,USB and Micro Port"
brand: "onyehn"
price: "KD 4.19"
currency: KWD
in_stock: true
url: https://www.desertcart.com.kw/products/66726321-12pcs-5v-boost-step-up-step-up-transformers-power-supply
store_origin: KW
region: Kuwait
---

# 5V input, 1.2A output power Supports 3.7-5.5V lithium batteries Built-in overcharge & overload protection 12Pcs 5V Boost Step Up Step-up Transformers Power Supply Module Lithium Battery Charge Protection Board for DIY Charger,with LED Display,USB and Micro Port

**Brand:** onyehn
**Price:** KD 4.19
**Availability:** ✅ In Stock

## Summary

> 🔌 Power up your DIY game with smart, safe, and versatile charging!

## Quick Answers

- **What is this?** 12Pcs 5V Boost Step Up Step-up Transformers Power Supply Module Lithium Battery Charge Protection Board for DIY Charger,with LED Display,USB and Micro Port by onyehn
- **How much does it cost?** KD 4.19 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/products/66726321-12pcs-5v-boost-step-up-step-up-transformers-power-supply)

## Best For

- onyehn enthusiasts

## Why This Product

- Trusted onyehn brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Reliable Power Boost:** Step-up transformer ensures stable 5V output for efficient charging.
- • **Smart Protection System:** Integrated safeguards prevent overcharging, over-discharging, and overload for battery longevity.
- • **Dual Charging & Discharging:** Supports simultaneous charging and discharging, perfect for DIY power projects.
- • **LED Charge Status Indicator:** Old version features intuitive red LED signals to keep you informed on charging progress.
- • **Universal Battery Compatibility:** Works seamlessly with Polymer, 18650 Lithium, cell phone, tablet, and MP3 batteries.

## Overview

This 12-piece set of 5V boost step-up transformer modules offers a compact, efficient solution for charging and protecting lithium batteries ranging from 3.7V to 5.5V. Featuring built-in MOSFET power management and advanced protection against overcharge, discharge, and overload, these modules support multiple battery types and simultaneous charge/discharge operations. With a handy LED indicator on select versions and USB/micro USB ports, they are ideal for professional DIY enthusiasts seeking reliable, scalable battery charging solutions.

## Description

The use of welding Note B + positive and B-negative can not be reversed  18650 battery Charging board size : 22*17*11mm Input : 5V 1A (charging red light) Output : 5V 1.2A (please do not take longer than 1200mA current device) Lithium voltage : 3V- 4.3V  Charging Interface : Micro USB  Available for various batteries like Polymer ,18650 Lithium ,Cell Phone ,Tablet and MP3 Battery The step up charging board can be connected to a lithium battery and connected in multiple sections of lithium batteries, as long as the voltage is 3.7-5.5V in parallel(only be connected in parallel, not in series) Charging instruction : Two versions are shipped randomly.Old Version charge status indication. Red light flashes when charging; Long red light when full;New Version has no lights. it has protection functions, protect from over-charger / over-discharger/ over-load ( support charger and discharger at the same time ) The image is for illustration Package Included: 12 X 5V Lithium Battery Charge Protection Board

## Features

- 🌟Built-in charge and discharge power MOS;The existing power management chip on the market all are HOTCHIP HT4928S which the parameters is same as134N3P
- 🌟Two versions are shipped randomly.Old Version charge status indication. Red light flashes when charging; Long red light when full;New Version has no lights.
- 🌟The step up charging board can be connected to a lithium battery and connected in multiple sections of lithium batteries, as long as the voltage is 3.7-5.5V in parallel(only be connected in parallel, not in series)
- 🌟Available for various batteries like Polymer ,18650 Lithium ,Cell Phone ,Tablet and MP3 Battery
- 🌟it has protection functions, protect from over-charger / over-discharger/ over-load ( support charger and discharger at the same time )

## Product Details

- **Brand:** Onyehn
- **Color:** Red
- **Item Weight:** 0.02 Kilograms
- **Input Voltage:** 5 Volts
- **Item dimensions L x W x H:** 3.94 x 3.15 x 0.39 inches

## Images

![12Pcs 5V Boost Step Up Step-up Transformers Power Supply Module Lithium Battery Charge Protection Board for DIY Charger,with LED Display,USB and Micro Port - Image 1](https://m.media-amazon.com/images/I/81eujFw1dbL.jpg)

## Questions & Answers

**Q: Just to confirm this is both a lipo charger and 5v boost converter, correct? when you remove the usb power, the battery will be boosted to output 5v?**
A: Yes, this device is both a lipo charger and 5v boost converter.  A few things I determined about its operation are: 
    1. When disconnecting the (micro) USB power the 5 Volt output power (at the Type A USB port )will drop to zero volts for about 200 to 300 msec and then switch to the 
        boosted 5 volt output.
    2. There also has to be a minimum output load for the output to be boosted. It was boosted when I had a 1 Kohm load, but it was not boosted when I had just had the 
          meter (~10 Megohm) on the output.  Then I just got the battery voltage. 
     3. The boosted output also seemed to have problems when supplying an output current near 1 amp.  I believe that is is only rated for 1 ampere output current.

**Q: My board charges my phone for 10 seconds, then get really hot and turns off and stops charging. Battery: 3.7v 16340 li-ion. Short circuiting? Help?**
A: If your phone is a fairly new model my best guess is that board cannot supply enough current.  The board I tested would only supply about 0.7 Amps.

**Q: Why does the output only read 3.9V?  I have 4V input.**
A: When you say you have a 3.9V input, I'm assuming you mean you have a battery connected. If you have a charged lithium ion battery connected with the plus terminal to B+ and the minus terminal connected to B-, you should see 5 volts output on the large usb connector. Some of these modules (not sure about this one) require a minimum load to be connected to the large usb connector before the full 5 volts is output. Try plugging in a phone and then check the voltage. It's also possible that you've got a bad module. In that case, try another one.

**Q: can i connect a solar cell directly to this to continuously power an esp01 charging in day and running on on battery at night?**
A: You'll need a Diode to block reverse current to the Solar panel.  Would not recommend it though as there will most likely be too much losses in the conversation and solar panel most likely will not put out enough current. But in theory it would work.

## Frequently Bought Together

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*Product available on Desertcart Kuwait*
*Store origin: KW*
*Last updated: 2026-02-17*