How do I know which charger to buy?
Charging Speed Matters: Amp and Wattage For instance, if you’re charging a smartphone, a charger with 18W to 30W of output will likely offer fast charging. For laptops, however, you’ll need a charger with at least 45W to 100W, depending on the device’s power requirements. Yes, you can use a 90 watt ac adapter, a. It will actually charge your battery faster. But, and this is a big but, you cannot use a 19 Volt ac adapter on an 18. Volt-laptop.
How to identify a type charger?
If the cable has a Type-A connector at one end (as in the above image), that will usually be the first type. The second will be the shape of connector that will plug into your device. Some cables have the same connector at both ends and are named accordingly—for example, a USB Type-C to USB Type-C cable. USB-A has been around since the 1990s and is the rectangular port most people recognize. On the other hand, USB-C is a newer, slimmer, reversible connector that supports faster data transfer, more power, and a broader range of devices. The key difference lies in evolution.