DIY 3.7v Battery Charger

Batteries are an important part of any battery-operated project or product. Rechargeable batteries are expensive because they require a separate charger, but they're worth the investment because they last longer and cost less over time than regular disposable batteries. They come in several different varieties based on their electrode materials and electrolytes—lead-acid, nickel cadmium (NiCd), nickel metal hydride (NiMH), lithium ion (Li-ion), and lithium ion polymer (Li-ion polymer).

Here is the step by step process for making your own DIY 3.7v Battery Charger.

Step 1: Get Your PCB Ready!

Supplies:

• Get all the components ready.

Step 2: Place All the Components on PCB and Solder It Properly.

• Soldering all the components to PCB.

Step 3: Connecting Remaining Wires.

• Connect battery wire to the pcb as shown.
• Connect power input wires to the pcb.
• Checking the battery voltage.

Step 4: Doing Some Settings.

• Now rotate the preset of the pcb to 4.2v as shown in images.

Step 5: Testing

• Checking the battery voltage before charging(3.9v).
• Connect the battery to the circuit then the green light will turn off, showing that the battery is charging.
• [30 mins later], green light is turned on indicating that battery is fully charged(4.2v) & the charger auto cut-off the charging.
• Verifying the charged battery by measuring the voltage using multimeter.
• Download Gerber file from HERE.

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Thank you for reading this guide, hopefully, this guide provides full steps to help you to create your own DIY 3.7v Battery charger. If you have any questions please post them in the comment section below.