The charger is a simple but very important part of a laptop’s lifespan. This guide answers the most common questions: how to know the right wattage for your device, what’s the difference between an original and a replacement charger, and how to fix a “charger connected but not charging” problem.
How to know the right wattage for your laptop’s charger
Every laptop needs a charger with a specific power rating (wattage), usually printed on the charger itself (like 45W, 65W, or 90W) or on a label under the device. The basic rule: use a charger with the same wattage printed on your device, or slightly higher – never use a charger with lower wattage than required, since it may charge very slowly or not charge at all under heavy load.
Original vs replacement (compatible) chargers
An original charger comes from the same manufacturer as the laptop (Dell/HP/Lenovo) and is designed exactly for that device’s specs. A replacement (compatible/universal) charger usually offers the same function at a lower price, but quality varies significantly by type:
- A replacement charger from a trusted brand that matches the specs (correct voltage and amperage): a safe and perfectly acceptable alternative in most cases.
- A very cheap, unbranded replacement charger: a real risk – it can damage the battery or even the motherboard if the voltage or amperage doesn’t match, or if it lacks overcurrent protection.
Tip: if buying a replacement charger, make sure the voltage matches the original exactly, and the amperage is equal to or slightly higher – never lower.
Fixing “charger connected but device not charging”
Try these steps in order:
- Check the cable and connector: look for any visible damage in the cable or the tip that plugs into the device.
- Try a different power outlet: to rule out an issue with the power source itself.
- Check the charging port on the laptop: look for dust or anything unusual inside it.
- Restart the device while it’s plugged in – sometimes the issue is software-related, not hardware.
- Try a different charger (if available) to confirm whether the issue is the charger or the device itself.
If you’ve tried all these steps and the problem persists, you likely need a new charger or a technical check of the battery/charging port.
When should you buy a new charger?
If the charger heats up abnormally, makes a crackling sound, the cable is cut or exposed inside, or the device charges intermittently despite trying all the fixes above – it’s time to replace it.
