Nickel-Cadmium (Ni-Cd) batteries once dominated the rechargeable battery market. From the 1960s to the 1990s, they were indispensable power sources in power tools, military equipment, emergency power supplies, and medical devices. With the rise of high-efficiency batteries like lithium-ion, their presence has faded from consumer electronics. However, Ni-Cd batteries continue to thrive in specific applications where their unique strengths remain unmatched. This post explores the truth about memory effect, key advantages and disadvantages of Ni-Cd batteries, and where they are still in use today.     What is a Nickel-Cadmium Battery? A Nickel-Cadmium battery uses nickel oxide as the cathode and cadmium as the anode, with an alkaline electrolyte (potassium hydroxide). Though it delivers a relatively low cell voltage of 1.2V, its robust structure, excellent low-temperature performance, and high charge-discharge durability made it a standard for various devices for...

If you're diving into woodworking or starting a DIY furniture project, one of the first tools you'll need is a drill . But with so many types and specs, choosing the right one can be overwhelming. In this post, we'll explore how to choose the best woodworking drill and take a look at the scientific technologies inside modern drills . 🔧 How to Choose a Woodworking Drill 1. Select the Right Type for Your Needs Electric Drill : Great for basic drilling and screw driving. Hammer Drill : Designed for concrete and masonry — overkill for wood. Impact Driver : High torque, perfect for heavy screw driving. 2. Voltage and Power 12V : Light-duty household or hobby use. 18V : More power for professional or heavy-duty woodworking. 3. Rotation Speed (RPM) Higher RPM allows faster drilling, but for wood, too much speed can burn or splinter the material. Look for drills with adjustable speed control . 4. Battery Type Lithium-Ion (Li-ion) : Lightweigh...