--- 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: "€ 15.81" currency: EUR in_stock: true reviews_count: 8 category: "Onyehn" url: https://www.desertcart.sk/products/66726321-12pcs-5v-boost-step-up-step-up-transformers-power-supply store_origin: SK region: Slovakia --- # 5V output boost power Supports 3.7-5.5V lithium batteries 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:** € 15.81 **Availability:** βœ… In Stock ## Summary > πŸ”Œ Boost your DIY game with smart, safe, and sleek power! ## 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?** € 15.81 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/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 - β€’ **Compact Powerhouse:** Ultra-small 22x17x11mm size fits any DIY project seamlessly. - β€’ **Dual Port Convenience:** Equipped with USB and Micro USB ports for flexible charging options. - β€’ **Real-Time Charge Status:** Old version features intuitive red LED indicators to keep you informed on the go. - β€’ **Smart Charge Protection:** Built-in safeguards prevent overcharge, over-discharge, and overload for battery longevity. - β€’ **Versatile Battery Compatibility:** Works flawlessly with Polymer, 18650 Lithium, cell phone, tablet & MP3 batteries. ## Overview This 12-piece set of 5V boost step-up power supply modules is designed for lithium battery charging with built-in MOSFET power management and multi-layer protection. Compatible with a wide range of lithium batteries (3.7-5.5V), it features USB and Micro USB ports, compact dimensions, and optional LED charge indicators. Ideal for professional DIYers seeking reliable, efficient, and safe 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 Review: Not a 134N3P, but a HOTCHIP HT4928S - First off this review is on the Onyehn 5Pcs 5V Boost Step Up Power Supply Module only. The main difference from description of the product, is the CHIP onboard, it is not a 134N3P, but is a HOTCHIP HT4928S instead. And there is no blue LED on board so don't haunt for it. The RED LED is labled LED 2 on board, with Led1, Led 3, and Led 4 positions vacant on board. Pin 2 of HT4928S connects to Led 2, and flashes for charging, and steady on for finish charge. Pin 1 of HT4928S does connect to vacant + Led 1, but goes HIGH when Pin 2 going to Led 2, is off. This would have been handy to tell when output V is on, but is sadly MIA. I include the schematic, plus front, back photos for reference. I am unable to find English description of internal setup of chip, maybe someone else will. The HOTCHIP does charge better than any of the TP4056 ones I have, and shuts off at 4.26v full charge. The chip runs warmer than others, and even the regular size USB socket is used as heatsink. At power off on supply, the VOUT on both USB sockets goes to 5.19V for about two seconds then off, if you don't have load. Under 1 A load with charge power cut off, the boost holds 5.1V. At 2A the voltage shuts off. Have not tested the low V on Battery shut off point. This is a great ultra small device that does work. Review: All have them have worked well so far! - Simple boards that I have used for a few different projects, mostly connecting a single 18650 lithium cell to for powering various lighting and Arduino boards. None were DOA and they were pretty easy to snap apart. I did accidently connect one using a battery box that was outputting 7-8 volts and not the 3-5 they are designed for. I thought I had a bad board because it kept shutting off. I realized my mistake, replaced the power source to a single 18650 cell and the board worked great again. Been running several of them for 8-10 hours a day for a few weeks now and no issues on overheating or dying. Will defiantly be getting these again. ## 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 ) ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07D3SQYKJ | | Best Sellers Rank | #297,559 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,307 in Power Converters | | Brand | Onyehn | | Color | Red | | Customer Reviews | 4.4 out of 5 stars 210 Reviews | | Input Voltage | 5 Volts | | Item Dimensions | 3.94 x 3.15 x 0.39 inches | | Item Weight | 0.02 Kilograms | | Item dimensions L x W x H | 3.94 x 3.15 x 0.39 inches | | Manufacturer | Onyehn | | Mfr Part Number | 225 | | Model Number | 5824093038 | | Number of Outlets | 1 | | Output Voltage | 5 Volts | | Plug Type | Micro USB | ## Product Details - **Brand:** Onyehn - **Color:** Red - **Input Voltage:** 5 Volts - **Item Weight:** 0.02 Kilograms - **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) ![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 2](https://m.media-amazon.com/images/I/51IsB+a1OQL.jpg) ![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 3](https://m.media-amazon.com/images/I/71WXwHyNJBL.jpg) ![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 4](https://m.media-amazon.com/images/I/71VbQjXzBiL.jpg) ![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 5](https://m.media-amazon.com/images/I/71SNMZBPnbL.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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Not a 134N3P, but a HOTCHIP HT4928S *by L***. on January 22, 2019* First off this review is on the Onyehn 5Pcs 5V Boost Step Up Power Supply Module only. The main difference from description of the product, is the CHIP onboard, it is not a 134N3P, but is a HOTCHIP HT4928S instead. And there is no blue LED on board so don't haunt for it. The RED LED is labled LED 2 on board, with Led1, Led 3, and Led 4 positions vacant on board. Pin 2 of HT4928S connects to Led 2, and flashes for charging, and steady on for finish charge. Pin 1 of HT4928S does connect to vacant + Led 1, but goes HIGH when Pin 2 going to Led 2, is off. This would have been handy to tell when output V is on, but is sadly MIA. I include the schematic, plus front, back photos for reference. I am unable to find English description of internal setup of chip, maybe someone else will. The HOTCHIP does charge better than any of the TP4056 ones I have, and shuts off at 4.26v full charge. The chip runs warmer than others, and even the regular size USB socket is used as heatsink. At power off on supply, the VOUT on both USB sockets goes to 5.19V for about two seconds then off, if you don't have load. Under 1 A load with charge power cut off, the boost holds 5.1V. At 2A the voltage shuts off. Have not tested the low V on Battery shut off point. This is a great ultra small device that does work. ### ⭐⭐⭐⭐⭐ All have them have worked well so far! *by W***T on September 8, 2022* Simple boards that I have used for a few different projects, mostly connecting a single 18650 lithium cell to for powering various lighting and Arduino boards. None were DOA and they were pretty easy to snap apart. I did accidently connect one using a battery box that was outputting 7-8 volts and not the 3-5 they are designed for. I thought I had a bad board because it kept shutting off. I realized my mistake, replaced the power source to a single 18650 cell and the board worked great again. Been running several of them for 8-10 hours a day for a few weeks now and no issues on overheating or dying. Will defiantly be getting these again. ### ⭐⭐⭐⭐ Based on HT4928S! *by B***S on September 2, 2019* Yup! it does work as boost 3.7vDC to 5vDC DC-DC converter as well as charge 3.7v Li-Ion batteries at about 700mAh under ideal conditions. The battery low voltage cutoff seems to be at 3.2vDC before it quits boosting 5vDC output. The only caveat is that the load must draw 60mAh minimum at all times for the boost converter to keep working. This could be a problem for low current draw applications. This is one major limitation of this design. The conversion rate seems 85% efficiency under real load conditions. It outputs 5.1vDC at 700-800mAh max any more load and it shuts itself off. There is only one RED LED on-board. Blue LED is not present, that RED shows ON state (Solid) and Blinks when charging and when charging is complete it becomes solid RED As other reviewers have pointed out it is "HOTCHIP HT4928S" based. Funny that they named the chip like that since it does get very hot during operation especially during charging 18650 3.7v Li-Ion batteries and high load conditions during the DC-DC conversion process. The USB port's metal fins are used as heatsink to some extent. This is a tiny self contained device suitable for various projects while it is not perfect it still works. For the price you pay you cannot complain much Rating the product with four stars! ## Frequently Bought Together - Onyehn 12Pcs 5V Boost Step Up Power Supply Module Lithium Battery Charge Protection Board for DIY Charger,with LED Display,USB and Micro Port - MakerFocus 3pcs NRF24L01+PA+LNA Wireless Transceiver RF Transceiver Module 2.4G 1100m with Antenna and 3pcs NRF24L01+ Breakout Adapter with 3.3V Regulator on-Board for Ar duino --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sk/products/66726321-12pcs-5v-boost-step-up-step-up-transformers-power-supply](https://www.desertcart.sk/products/66726321-12pcs-5v-boost-step-up-step-up-transformers-power-supply) --- *Product available on Desertcart Slovakia* *Store origin: SK* *Last updated: 2026-05-22*