Features: The 18650 dummies Battery 0V NonConductive Spacer replaces real batteries by enabling direct power supply via adapters, with nickel plated manganeses steel for enhances conductivity and durability in electronics projects. Featuring 0V nonconductive terminals and welded contact points, this battery eliminators safely bridges power sources to devices without risk of short circuiting, for adapter dependent setups. Perfect for electronics trainers teaching soldering skills, hobbyists building customs circuits, and technicians creating permanent adapter powered solution for low voltages gadgets. Seamlessly integrate with LED lamps, desk fans, portable speakers, or security cameras by soldering 3.7V adapters to its terminals for stable corded power in homes, workshops, or electronic labs. Engineered as not voltages placeholders, this spacer prevents accidental battery drain while serving as connector for toy, gadgets, and small appliances requiring continuous adapter based operations. Specifications: Materials: Nickel plating on manganeses steel Color: Blue, Red, Yellow(optional) Height: About 65mm Diameter: About 18mm Quantity:2Pcs Package Includes: 2Pcs Battery placeholders note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.