DIY Battery Charger Case for 18650/21700 Batteries

Rated 3.80 out of 5

DIY battery charger case for 18650 or 21700 single batteries. Features Type-C port, durable aluminum shell, and built-in protection.

Color

Clear

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Estimated Delivery Time3–7 business days

Compact and Versatile Power Solution

This DIY battery charger case supports a single flat-head 18650 or 21700 polymer battery (battery not included). Its flexible design accommodates popular battery sizes, making it ideal for customizing portable power needs.

The case allows DIY assembly without soldering, using a Type-C interface for straightforward, hassle-free installation and charging.

Robust Aluminum Alloy Construction

Crafted from durable aluminum alloy, the case offers excellent heat dissipation to maintain safe operating temperatures during charging.

Its streamlined design combines functionality with a fashionable appearance, available in black, silver, gold, and red colors to suit your style.

Efficient Fast Charging and Safety Features

Supports 5V/2A fast charging, delivering up to 10W power output to quickly recharge your battery and save time.

Built-in protections guard against overcharge, overdischarge, and short circuits to ensure reliable and safe operation during use.

Key Specifications

Output: 5V / 2A (10W)
Battery compatibility: single flat head 18650 or 21700 (not included)
Material: aluminum alloy
Color options: black, silver, gold, red

What's in the box

Solder-free DIY battery charger case (color of your choice)

CategoriesPower Banks

Tags18650 battery shell, 21700 battery case, aluminum battery shell, DIY battery case, portable battery enclosure, Type-C battery charger

Weight—

AvailabilityIn stock

SKUGA_103374

Discussion

3.8

Rated 3.8 out of 5 based on 5 customer ratings

Based on 5 reviews

S***n May 20, 2026 ★ ★ ★ ★ ★

This is for a 21700 lithium-ion battery, for which the standard size is 21mm in diameter and 70mm long. However, the 21700 batteries i have are 22mm in diameter and 76mm or 77.5mm long. They do not fit. I flattened the positive terminal slightly and the 76mm long batteries just barely fit. The one that is 77.5mm long does not fit at all. Note, the battery that is 77.5mm long has a built-in usb-c charging port. Any 21700 batteries that meet the standard size will fit easily.

The only way the charger case will work is to charge the case using the usb-c port and by charging an external device using the usb-a port. It does not put out enough current to charge my samsung galaxy a53 5g phone, but it does charge my earbuds and bluetooth speakers.