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The battery case holder with screw hole at the bottom and wire preinstalled, it is easy to use. Metallic spring, the black and red two wire design, they are tinned wire end, it is great for easily soldering or connecting, convenient for electric circuit DIY work. Easy installation battery holder for 18650 3.7V battery, you can use this case with your own battery to form power system supply. Durable enough springs hold batteries to the contacts without any loosening, these parts will be the best partner of your daily use. Simple DIY recharge power supply. A useful product for many DIY projects such as: electronic products, breadboard power supply, toy car, LED projects, and so on.