DIY power bank module solderless — 1–5x 18650 cells, LCD indicator, USB output, LED flashlight

Build your own portable USB power bank without any soldering using this all-in-one DIY power bank module. Designed for simplicity and flexibility, it accepts 1 to 5 standard 18650 lithium-ion cells (3.6V–3.7V, not included) and provides a regulated 5V USB output for charging smartphones, tablets, and other USB devices. The built-in LCD display shows remaining battery capacity and charging status at a glance, while the integrated LED flashlight adds practical utility for everyday carry.

Whether you're a beginner building your first power bank or an experienced maker customising a high-capacity portable charger, this module makes the process straightforward — just insert your 18650 cells, connect a USB cable, and you're ready to go.

Key Specifications:

• Battery type: 18650 lithium-ion, 3.6V–3.7V (batteries not included)
• Battery capacity: 1 to 5 cells (use same type/capacity cells)
• Output: 5V USB (standard USB-A)
• Display: LCD showing battery capacity percentage and charging status
• LED flashlight: built-in
• Side switch: battery status check and flashlight control
• Simultaneous charge and discharge: yes
• Soldering required: none

Key Features:

• No soldering required — plug-and-play assembly, ideal for beginners and quick builds
• 1–5 cell flexibility — scale capacity from ~3,000mAh (1 cell) up to ~15,000mAh+ (5 cells)
• LCD capacity indicator — shows remaining charge percentage and charging/discharging status
• Simultaneous charge and discharge — charge the bank while powering a device
• Built-in LED flashlight — press once to check battery, press twice to toggle flashlight
• Side switch for battery status check without connecting a load

Button Operation:

• Press once — check remaining battery level on LCD
• Press twice — toggle LED flashlight on/off

Applications:

• DIY portable USB power bank for smartphones and tablets
• Custom high-capacity power bank builds (up to 5x 18650)
• Camping and outdoor portable charger
• Maker and electronics project power supply
• Emergency backup USB charger

Note: Batteries are not included. Use matched 18650 cells of the same brand, capacity, and charge level. Do not mix old and new cells. Ensure cells are genuine 18650 lithium-ion rated at 3.6–3.7V.