Hi everyone, here in my hand is the world’s smallest single-cell Type-C 3.7V to 4.2V lithium battery charging module.
📌 Buy on Aliexpress:
🔗 Charging Board: https://s.click.aliexpress.com/e/_c3updRvR
Compared to the traditional TP4056 and similar options on AliExpress, this module is incredibly small, insanely compact, lightweight, and very affordable. I got this whole lot of 20 modules for around AU$8, what a bargain! Plus, this tiny device comes with built-in overcharge and Overheating during charging protection.
What’s Missing?
The LTH7R alone does not provide over-discharge protection, over-current protection during discharge, or battery short-circuit protection. For complete battery protection, you would pair it with a dedicated protection IC like the DW01 (often used with dual MOSFETs like 8205).
Thanks to its compact size, it can be easily embedded into tight spaces, like smart wearable or micro-drones, without adding any extra bulk
Under a microscope, the board reveals two LEDs on top and the charging pads at the bottom. The Green LED on the left is the charging indicator which lights up when the battery is fully charged. The Red LED on the right is the power indicator, which stays on as long as the charging cable is connected.
Be careful to identify the positive and negative charging pads: the left pad is negative, and the right pad is positive. The main IC on the board is the LP4054, a 600mA Li-ion battery charger IC.
Soldering this module is a bit tricky. You’ll need decent micro-soldering skills to mount it onto a board.
This charging board uses a constant current / constant voltage (CC/CV) charging method, which maximizes the charging rate while preventing overheating. This not only maintains safe operating temperatures but also prolongs the battery’s lifespan.
This charging board delivers a precise charge voltage of 4.2V with an accuracy of ±1%, ensuring both safe and efficient charging. This level of precision helps protect the battery and extend its overall lifespan. The board also includes thermal regulation to prevent overheating during charging, though it can still get slightly warm while in use.
This board is designed for single-cell batteries only. Do not connect batteries in series, and avoid exposing the board or battery to high temperature or pressure.
🔋 Batteries that can be charged:
✅ 18650 Batteries
✅ 14500 Batteries
✅ 10440 Batteries
✅ 16340 Batteries
✅ 3.7v Power Banks
✅ 3.7v Li-Po Batteries
🔋 Batteries that cannot be charged:
❌ Ni-MH Batteries
❌ Ni-Cd Batteries
❌ 7.4V or 11.1V Batteries
❌ Non rechargable Li Batteries
Because of its small size and lack of screw holes, I found this board a bit difficult to integrate into my projects.
So, what should we build with this next? Drop a comment and subscribe for more DIY tech reviews and projects like this.
🔋 Features:
🔥 Type-C USB charging
🔥 Ultra-compact design, perfect for small-scale projects
🔥 Compatible with 3.7V Li-Ion and Li-Po batteries
🔥 Full charge voltage: 4.2V (±1%)
🔥 Built-in protection against short circuits, over-charge, and over-discharge
🛠️ Applications:
🔥 Portable electronics builds
🔥 Smart wearables
🔥 Micro-drones
🔥 Bluetooth and IoT devices
🔥 DIY powerbank projects
⚠️ Important Note:
🔥 This board is designed for single-cell batteries only. Do not connect batteries in series.
🔥 The LTH7R alone does not provide over-discharge protection, over-current protection during discharge, or battery short-circuit protection. For complete battery protection
📌 Buy on Aliexpress:
🔗 Charging Board: https://s.click.aliexpress.com/e/_c3updRvR
