Batteries & Holders
Batteries & Holders – Power Every Project with Confidence
Whether you're building a DIY electronics project, maintaining power tools, or replacing worn-out battery contacts in a device, our Batteries & Holders collection has everything you need. From reliable cell mounts and spring contacts to smart chargers, adapters, and protective storage cases, we stock a comprehensive range of components for hobbyists, engineers, and professionals alike. Browse top-quality 18650, 21700, AA, AAA, CR123A, and 9V battery accessories — all designed for durability, safety, and drop-in compatibility with popular devices and custom builds.
Featured Products
- 18650 Battery Storage Case – Waterproof Shockproof Lock Box — Keep your lithium cells safe from moisture, impact, and short circuits with this rugged carry case.
- 10-Pack 21700 Battery Holder Brackets | Anti-Vibration Cell Mount — Securely mount 21700 cells in any build with vibration-dampening brackets, sold in convenient 10-packs.
- 18/21V/24V Dual-Head Lithium Battery Charger | Overload Safe — Safely charge a wide range of lithium-ion battery packs with built-in overload protection for peace of mind.
- 1.5V 1A Power Adapter – Replaces AA AAA C D Size Batteries — Eliminate disposable batteries entirely by powering your devices directly from a wall outlet with this versatile adapter.
- 10-Pack SMT Battery Leaf Spring Contacts – AA, CR123A, 9V — Restore reliable electrical contact in remotes, flashlights, and PCB assemblies with these nickel-plated SMT leaf springs.
What's in Our Batteries & Holders Collection?
Our collection covers the full spectrum of battery power components:
- Battery Holders & Cases: Secure mounts and protective enclosures for 18650, 21700, AA, AAA, and gas boiler battery formats.
- Spring Contacts & Terminals: SMT leaf spring contacts and nickel-plated tabs for AA, AAA, CR2, CR123A, 9V, and 18650 cells — perfect for repairs and new builds.
- Chargers: Multi-voltage lithium battery chargers with safety features like overload protection for power tool batteries.
- Adapters & Converters: Battery size adapters, dummy battery eliminators, and power tool battery converters to extend compatibility across devices.
- Battery Packs & Connectors: Complete 18V 10-cell 18650 battery cases with BMS, nickel connector plates, and cell connector sets for building custom battery packs.
Why Shop With Us?
- ✅ Wide selection of standard and specialty battery formats
- ✅ Components engineered for safety — anti-vibration mounts, BMS-integrated cases, overload-protected chargers
- ✅ Bulk packs (10–20 pieces) for professional and production use
- ✅ Drop-in replacements that fit popular consumer and industrial devices
- ✅ Detailed specifications so you can buy with confidence
Learn more: EPA guidance on lithium-ion battery handling
Frequently Asked Questions
Q: What is the difference between 18650 and 21700 battery holders?
A: The numbers refer to the physical dimensions of the cylindrical lithium-ion cells. An 18650 cell is 18 mm in diameter and 65 mm long, while a 21700 cell is 21 mm in diameter and 70 mm long. Our 18650 to 21700 Battery Sleeve Adapter lets you use 18650 cells in 21700 holders, giving you maximum flexibility across your devices and builds.
Q: Can I replace disposable AA or AAA batteries with an adapter instead of buying new cells?
A: Yes! Our 1.5V 1A Power Adapter plugs into a standard wall outlet and delivers the same 1.5V output as AA, AAA, C, and D size batteries — ideal for devices that run continuously, like clocks, radios, or baby monitors, saving you money on disposable batteries over time.
Q: What are SMT battery leaf spring contacts used for?
A: SMT (Surface Mount Technology) battery leaf spring contacts are small metal springs soldered directly onto a PCB to create the positive or negative terminal connection for a battery. They are commonly used in remotes, flashlights, medical devices, and consumer electronics. Our 10-Pack 5231 SMT Battery Leaf Spring Contacts are compatible with AA, CR2, CR123A, and 9V cells.
Q: How do I safely store 18650 lithium-ion batteries?
A: Lithium-ion cells should always be stored in a dedicated, non-conductive case that prevents terminals from shorting against each other or metallic objects. Our 18650 Battery Storage Case is waterproof, shockproof, and features a secure lock, making it ideal for home storage, travel, and job-site use.
Q: What is a Battery Management System (BMS) and why does it matter in a battery pack?
A: A BMS (Battery Management System) is a protective circuit that monitors and balances individual cells in a battery pack, preventing overcharge, over-discharge, and short circuits. Our 18V 10-Cell 18650 Battery Case with BMS & Nickel Connector Plate includes an integrated BMS, making it a safe and reliable choice for custom power tool or e-bike battery builds.
