Is it safe to use a laptop charger with a lower amp rating?

There’s a chance the charger could get hotter than usual, so just keep an eye on it. It might work, but if you’re using something like a phone charger, be cautious—it could heat up and even pose a fire risk or burn out quickly if used for a long time. You might want to consider getting a proper laptop charger online, as they're pretty affordable these days.

You might find that it either charges really slowly or not at all while you're using your laptop. It might charge fine when the laptop is off, but some laptops actually won’t start up if the charger is detected as low voltage. So, just a heads up on that!

If you switch to this new charger, it will likely charge your laptop more slowly. Just make sure that the voltage, as well as the polarities, match—those are important. Using a charger with a lower amp will usually mean that the laptop might perform worse while charging or just charge slower overall because it’s underpowered. By the way, your original charger seems a bit weak at 40W—was that the one that came with your laptop?

If your new charger is USB-C, it should technically work. Just know that charging speeds will be lower than what you're used to.