5V Mini USB Power Input or 3.7V lithium Batt Charger to 5V USB Out

A dual-function module that simultaneously charges a 3.7 V Li-ion/LiPo cell from Mini USB input AND boosts the battery output to a stable 5 V USB-A output. The core of any DIY power bank — charge in and power out at the same time, with full battery protection.

🔹 Key Applications

• DIY mini power bank builds
• Rechargeable portable project power supplies
• Solar-to-battery-to-USB charging systems
• Wearable electronics rechargeable power core
• Backup USB charging for field equipment

🔹 Why Choose This Module?

• Charge and discharge simultaneously — power your device while charging the battery
• Mini USB input for charging (also works with Micro USB adapters)
• 5 V / 1 A USB output — charges phones and MCU boards
• Overcharge and over-discharge protection built in
• Compact module — insert any 18650 or LiPo cell and go

🔹 Technical Specifications

• Input: Mini USB 5 V
• Battery: 3.7 V Li-ion / LiPo (not included)
• Output: USB-A 5 V / 1 A
• Protection: Overcharge, over-discharge, short-circuit

🔹 What's Included

1 × Mini USB Li-ion Charger + 5V Boost Module

🔹 Pro Tip

💡 Pair with a genuine 2500 mAh 18650 cell for a practical pocket power bank delivering ~1200 mAh of USB output (after boost conversion losses). The pass-through charging capability means you can keep the power bank plugged in and use your device simultaneously.

⚠️ Note: Always ensure proper heat dissipation and correct voltage configuration before powering connected devices.