DIY Power Bank Case for 18650/21700 Batteries – Shell Only

Build your own portable charger with this DIY Power Bank Case — a versatile, multi-slot battery box compatible with 18650, 18700, 20700, and 21700 lithium-ion batteries. Featuring a digital power display, built-in flashlight, and multiple charging port options, this compact shell lets you create a custom external battery pack for virtually any USB-powered device. Battery not included.

Made in Mainland China.

Why You'll Love This DIY Power Bank Shell

• Universal Battery Compatibility: Works with 18650, 18700, 20700, and 21700 flat-top and pointed-tip rechargeable lithium-ion batteries — use 1 or 2 cells at a time for flexible capacity.
• Multiple Model Options: Choose from three configurations — H02 (3-port input: Micro USB + Type-C + Lightning), H02B (2-port input: Micro USB + Type-C), or H02C (Type-C two-way fast charging with QC3.0 & PD3.0 support up to 18W).
• Intelligent Protection Circuit: Built-in overcharge, over-discharge, over-current, anti-reverse connection, and anti-series battery protection keeps your devices and batteries safe during every charge cycle.
• Digital Power Display: Real-time LED power indicator so you always know how much charge remains.
• Built-In Flashlight: High-brightness flashlight integrated into the shell for added convenience on the go.
• Widely Compatible: Charges smartphones (iPhone 6/7/8/X/XR/XS/11/12/13/14 Pro Max and Android), tablets, digital cameras, fans, flashlights, and other DC 5V devices.
• Durable & Portable: ABS shell with anti-slip, anti-sun-damage surface treatment. Sliding cover design, easily disassembled and reassembled. Compact size: 118 × 58 × 27 mm / approx. 4.65 × 2.28 × 1.06 in. Weighs just 65g.
• Eco-Friendly: Supports rechargeable battery reuse — reduce waste and save money over disposable solutions.

Specifications

• Compatible Batteries: 18650 / 18700 / 20700 / 21700 lithium-ion (flat & pointed tip)
• Number of Battery Slots: 2 (use 1 or 2 batteries)
• Material: ABS plastic, anti-slip surface finish
• Shell Type: Sliding cover, detachable
• Colors Available: White, Black
• H02 Input: Micro USB 5V/2A | Type-C 5V/2A | Lightning 5V/1A
• H02B Input: Micro USB 5V/2A | Type-C 5V/2A
• H02C Input/Output: Type-C QC3.0 & PD3.0 — 5V 3.1A / 9V 2.0A / 12V 1.5A (two-way fast charging)
• H02 & H02B Output: 5V/2A (max 2.4A), intelligent adaptive
• Protection: Overcharge / over-discharge / over-current / anti-reverse / anti-series connection
• Product Dimensions: 118 × 58 × 27 mm (4.65 × 2.28 × 1.06 in)
• Weight: 65g
• Origin: Made in Mainland China
• Package Includes: 1 × DIY Power Bank Shell/Case (batteries NOT included)

What's in the Box?

• 1 × DIY Battery Case / Power Bank Shell (no batteries)

Note: Colors may vary slightly due to monitor settings and lighting. Please allow ±1–2 cm measurement deviation due to manual measurement.

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For guidance on the safe use and handling of lithium-ion batteries, visit the U.S. Consumer Product Safety Commission – Lithium Battery Safety.

Frequently Asked Questions

Q: Does this DIY power bank case come with batteries included?

A: No — this product is a battery case/shell only and does not include batteries. You will need to purchase compatible 18650, 18700, 20700, or 21700 lithium-ion rechargeable batteries separately to use this power bank.

Q: Can I use just one battery in the two-slot DIY power bank case?

A: Yes! This case supports both single-battery and dual-battery operation. You can use one or two batteries at the same time, and the built-in protection circuit ensures safe operation even with a single cell installed.

Q: What devices can I charge with this DIY power bank shell?

A: This versatile power bank case can charge virtually any USB-powered device — including iPhones (6 through 14 series), Android smartphones, tablets, digital cameras, small fans, electronic door locks, flashlights, and other devices running on 5V DC power. Selecting a model with fast-charge support (H02C) also enables quick charging for compatible smartphones.

Q: What is the difference between the H02, H02B, and H02C models?

A: The H02 supports three input interfaces (Micro USB, Type-C, and Lightning at up to 10W), the H02B supports two inputs (Micro USB and Type-C at up to 10W), and the H02C features Type-C two-way fast charging with QC3.0 & PD3.0 support at up to 18W — ideal for fast-charge-compatible phones and accessories.