1. Suitable for DIY and maintenance of all kinds of dc equipment, screw hole and wire pre-assembled at the bottom, easy to use. 1. Easy to install: The battery is fixed with a stainless steel spring. It is very convenient to install and replace the battery, and it is not easy to damage other parts. 3. Hard material: using hard material, high strength, good toughness, not easy to crack. 4. DIY: It can be installed with different sizes of battery box, can take 3.7V, 7.4V, 11.1V, 14.8V dc power supply voltage. 5. Applications: toys, electronic DIY, bread board power supply, LED lighting power supply, low voltage electrical equipment, remote control, radio, quartz watch, wireless keyboard, electronic calculators, doorbell, mobile digital recorder, remote control, radio, quartz clock, electronic calculators, doorbell, tape machine, electric toys, kids/adults wireless mouse/keyboard, powerful light flashlight, electric shavers, camera flash, electric toothbrush, game handle, hand with strong light flashlight Premium Copper Conductors:  Features copper conductors for reliable power transfer and improved conductivity, ensuring optimal performance for your electronic projects Tinned Wire Ends:  The wire leads come with tinned ends, making them easy to solder for secure connections, ideal for DIY electronics or hobby projects