Posts

Showing posts from January, 2021

Can you carry laptop on your flight?

Image
When you buy a new laptop, your lithium battery might be shipped in a plastic bag with UN 3480 label on it (see Figure 1).  What does it mean?  Can you carry your laptop (lithium battery included) on your flight? Figure 1.  UN 3480 , Lithium ion batteries (shipped by themselves) Types of Lithium Batteries Lithium batteries  are dangerous goods and, as such, require special packaging for transportation. All domestic and international shipments containing lithium batteries are subject to transport regulations on hazardous goods according to  ADR (truck)/RID (rail) ,  ADN ,  IMDG ,  ICAO  /  IATA  Regulations. Lithium batteries are basically distinguished as: [2] Lithium metal batteries  In general are non rechargable and contain metallic lithium.  Lithium ion batteries Don´t contain metallic anymore, but a lithium compound (lithium oxide) and they are rechargable. Often they are called accumulators. What's UN 3480? The Unite...

USB — Knowing the Basics of Universal Serial Bus

Image
Universal Serial Bus (USB) is an industry standard that establishes specifications for cables and connectors and protocols for connection, communication and power supply ( interfacing ) between computers, peripherals and other computers. A broad variety of USB hardware exists, including eleven different connectors , of which USB-C is the most recent. Figure 1.  Lenovo T495 Figure 2.  Lenovo ports layout Always On USB 3.1 connector (Figure 2.9) There is a feature called "Always On USB" which allows devices connected to the laptop via USB to be powered over USB even when the Operating system (Windows 10 in my case) shuts down . USB 2 and USB 3 Compatibility USB 3.0 backwards is compatible—meaning it's designed to work with older USB versions including USB 2.0 and USB 1.1.  You can plug a USB 2.0 device into a USB 3.0 port and it will always work, but it will only run at the speed of the USB 2.0 technology. USB 3.0 Flash Drives and card readers are backwards compati...