Universal Dual-Size Battery Holder (18650 & 21700 Compatible)

by Boyyt

Upgrade your battery-powered projects with this versatile 3D-printable battery holder, specially designed to securely fit both 18650 and 21700 lithium-ion cells in a single unit! Whether you're a maker, DIY electronics enthusiast, or just looking for a clean way to manage your batteries, this model allows you to: Swap between 18650 (18×65 mm) and 21700 (21×70 mm) batteries without needing separate holders. Easily print and assemble — no supports required (depending on orientation). Use it in robotics, power banks, flashlights, or other electronics projects. 📝 Suggestion Print Upside down for no Support 🎯 Features: Compatible with both 18650 and 21700 battery sizes Secure locking channels to prevent battery movement Compact and modular design Easy to print on most FDM 3D printers