18650 Battery Holder Wire, the black and red two-wire design is great for easy soldering and connecting. Can receive the voltage 3.7V, 7.4V, 11.1V, 14.8V DC power supply. The battery holder is fixed by a stainless steel spring. It is very convenient to install and replace the battery, and it is not easy to damage other parts. 18650 battery case compatible with for Ardu Ino board microcontrollers, LED projects, toys, also replaces broken battery holders for many electronic devices. 18650 battery holder bundle with wire is suitable for home improvement and maintenance of all kinds of DC equipment, with screw hole on the bottom and wire pre-installed, it is easy to use. : 18650 battery case Perfect for use in electronics and small hobby projects. Battery type: for 1/2/3/4 x 3.7 V 18650 battery (battery is not included). Note: Please do not use this battery box, only use it for 1/2/3/4 x 3.7V 18650 battery output. Please do not connect the positive and negative directly. When connected, the cable will get hot. Material:plastic colour:black Package Contents: 4 * 18650 battery holder case single slot 4 * 18650 battery holder housing 2 slots 2 * 18650 battery holder housing 3 slot 2 * 18650 battery holder housing 4 slots Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.