Portable Laptop Charger

It's generally better to charge your laptop to around 80% rather than 100%. Charging to 80% helps prolong the battery's lifespan by reducing stress on the battery, as lithium-ion batteries (commonly used in laptops) last longer when they aren't constantly fully charged.

 However, occasional full charges won’t harm the battery significantly. If you need to use the laptop for long hours, charging it to 100% is fine, but for daily use, aiming for 80% is optimal for longevity.

On average, most laptops use between 30 watts to 100 watts for charging. Laptops with smaller screens (11-13 inches) typically require around 30-45 watts, while larger models (15-17 inches) may need 65-100 watts. 

Some high-performance laptops, especially gaming or workstation models, can require even more power, up to 150 watts or higher. The charging speed also depends on the efficiency of the charger and the battery's state of charge.

Most modern laptops use a USB-C charger with Power Delivery (PD), while larger or gaming laptops often require a proprietary charger with a barrel connector. Check your laptop's power input and charging port to choose the right charger. If it supports USB-C, any compatible charger with sufficient wattage will work.

No, it's not bad. Laptops will only draw the power they need, even if you're using a higher-wattage charger. The key is ensuring the voltage and connector type are compatible with your laptop. As long as they match, the laptop will safely regulate the charging power.