LED Dual USB 5V 2.4A 2A 1A Micro/Type-C USB Mobile Power Bank 18650 Charging Module Lithium Battery Charger Board Circuit Protection

LED Dual USB 5V 2.4A 2A 1A Micro/Type-C USB Mobile Power Bank 18650 Charging Module Lithium Battery Charger Board Circuit Protection

Important Notice for DIY Buyers (Please Read Carefully)

1. Battery Requirements

Must use flat-top 18650 batteries (65mm in length). Button-top batteries are not compatible.

Do not mix old batteries: Avoid using mismatched batteries (different brands, capacities, or recycled cells).

Voltage requirement: Each battery must have a minimum voltage of 3.5V—if too low, charging may not start.

Compatible batteries: You may also use lithium batteries from phones/tablets (if properly connected).

2. Why Does Charging Stop After a Few Seconds?

Missing protection circuit: If even one battery lacks a protection board, charging will automatically shut off.

3. Identifying Battery Polarity

18650 Battery:

Flat end → Negative (–) terminal

Raised end (with vent holes) → Positive (+) terminal

Warning: Reversing polarity will instantly damage the circuit board, rendering it unusable even if corrected!

4. No Power Output After Installation?

Activation required: After inserting the battery, connect a 5V charger to activate the module.

5. Efficiency (Conversion Rate)

New, fully-rated batteries: ~80% efficiency (accounting for wire losses).

Old/mixed batteries: Efficiency varies—capacity and internal resistance degrade over time.

Note: Recycled batteries often have inconsistent performance, making accurate efficiency claims impossible.

6. Troubleshooting Charging Issues

(1) Sudden Charging Stop/Auto Shutdown

Causes:

High internal resistance in old batteries (requires professional testing).

Poor-quality charging cables or insufficient current (use a 5V/2.1A charger for loads >1A).

Solution: Replace with new batteries or use high-quality cables.

(2) Stuck at 99% Charge

New batteries: Fully discharge (e.g., by powering a phone until shutdown) before the first full charge.

Old batteries: If still stuck after discharge, the battery may be degraded—replacement is recommended.

(3) Inaccurate Battery Percentage (e.g., 50% shown as 80%)

Calibration method:

After first installation, discharge the battery completely.

Recharge fully to recalibrate the display.

All digital power banks require this step!

Friendly Reminders:

Recycled batteries pose risks—we recommend new, branded batteries.

For high-power devices, use reliable chargers and cables.

If issues arise, first check battery health and connections.

Features:

Portable Mobile Power Supply Module.

Supports 3 USB cables.

Hold down the button after standby, LED digital display power supply.

LED digital screen shows current battery power when charging.

When discharging, the LED digital screen displays the current power, and the display saves about 30 seconds (double-click button to restore the display).

After charging and discharging, the system will provide accurate battery instructions.

Specifications:

Material: ABS

Size: 65*25*5mm/2.56*0.98*0.2"

Notes:

1. Due to the different monitor and light ef