DIY 18650 Power Bank Case 8/10 Slots Dual USB LED Display

Build Your Own High-Capacity Power Bank — DIY 18650 Battery Case

Take charge of your power needs with this versatile DIY 18650 Battery Power Bank Case. Available in 8-slot and 10-slot configurations, this portable shell lets you assemble a custom power bank using standard flat-head 18650 batteries (not included). Whether you're heading outdoors, traveling, or preparing for emergencies, this power bank case delivers reliable, on-the-go charging for all your USB-powered devices.

Made in Mainland China.

Key Features

• 8 or 10 Battery Slots: Accommodates flat-head 18650 batteries for a high-capacity DIY power bank build. Simply insert your batteries and go.
• Dual USB Output & Micro USB Input: Charge two devices simultaneously while recharging the power bank itself via the Micro USB port.
• LED Digital Power Display: Real-time battery level indicator so you always know exactly how much juice you have left.
• Built-in Dual LED Flashlight: Integrated emergency flashlight — perfect for camping, power outages, and outdoor adventures.
• Multi-Layer Safety Protection: Features built-in short circuit, overcharge, and overheating protection for worry-free use.
• Anti-Slip Textured Surface: Ergonomic, grippy exterior ensures a secure hold even in wet or active conditions.
• Easy Spring-Contact Assembly: Tool-free battery installation with spring contacts — no soldering required.
• Wide Device Compatibility: Works with virtually all 5V USB-powered devices including smartphones, tablets, earbuds, and more.
• Portable & Lightweight: Slim, travel-friendly design fits easily in a backpack, pocket, or emergency kit.

Specifications

• Battery Slots: 8 or 10 × 18650 Flat-Head Batteries (batteries NOT included)
• Output: Dual USB (5V)
• Input: Micro USB
• Display: LED Digital Power Level Indicator
• Extra Feature: Dual LED Flashlight
• Protections: Short Circuit, Overcharge, Overheating
• Origin: Mainland China

Perfect For

• DIY electronics enthusiasts and makers
• Camping, hiking, and outdoor adventures
• Emergency preparedness kits
• Travel and everyday portable charging
• Anyone who wants a customizable, high-capacity power solution

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Learn More About Battery Safety

For guidance on safe battery handling and storage, visit the U.S. Consumer Product Safety Commission or read about used lithium-ion battery recycling and safety from the EPA.

Frequently Asked Questions

Q: What type of batteries does this 18650 power bank case require?

A: This DIY power bank case is designed specifically for flat-head (unprotected) 18650 lithium batteries. Batteries are not included — you will need to purchase them separately. Make sure to use quality flat-top 18650 cells for best performance and safety.

Q: Can I charge two devices at the same time with this power bank case?

A: Yes! The case features dual USB output ports, allowing you to charge two 5V USB-powered devices simultaneously — such as smartphones, tablets, or Bluetooth earbuds.

Q: How do I recharge the power bank case itself?

A: The case recharges via the built-in Micro USB input port. Simply connect it to any standard Micro USB charger or cable to replenish your 18650 batteries inside the case.

Q: Is this power bank case safe to use?

A: Yes. The case includes built-in short circuit protection, overcharge protection, and overheating protection to keep both your batteries and connected devices safe during use and charging. Always use quality 18650 batteries and follow safe battery handling practices.

Q: Do I need any tools to assemble the DIY power bank?

A: No tools are needed. The case uses spring-contact battery slots for easy, tool-free installation. Simply insert your flat-head 18650 batteries and the case is ready to use.