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Can I use a 6amp charger for a 6.3amp laptop? Answered

I have a laptop that requires 19v 6.3amp and I can buy a multi-voltage universal charger with 6amps for £35 while a multi-voltage universal charger up to 8.5amp costs £59.

Can I use the charger that supplies 6amp even though my laptop states it needs 6.3?



7 years ago

It's always better to give yourself a little safety margin. If you're going to charge and power the laptop at the same time, which is what most people do a lot of the time, then 6 amps might not be enough. Anyone with a laptop knows how hot those chargers get even when they're the OEM part, I wouldn't want to push that past the limit.

So, get a charger that can handle the current.

You're going to run hot if it runs at all, since you're under the headroom for the supply.

My answer is simple. No. 

You *can do anything your heart desires, but my guess is that you're going to end up spending another 35 pounds in short order when it burns out, if indeed the 0.3A difference doesn't mean a total fail from day one and pissing around with returning the one you just bought and replacing it with a supply sized properly for the load.

If you do use that one, don't come back later telling us your laptop has stopped working properly...
I see "buy it nows" on eBay at much less than £35 for laptop power supplies, why not get the right device for the job?


That's a definite "maybe".

If you use it *only* as a charger, rather than trying to run the PC at the same time that you're charging its battery, I'd say you'll probably be able to get away with it.

If you want to run the PC off it while charging... It depends on exactly what you're going to ask the PC to do, at what speeds. The 6.3 is a maximum power demand. Low-speed operation saves power, using the disk less saves power, not using USB devices (or at least using them only through a separately powered hub) will save power, keeping the screen dim will save power...

The real concern here is what the failure mode would be if you do draw more power than the charger can supply, and how the laptop responds to that. The good failure mode would be for its voltage to drop below the rated 19 volts but it wouldn't over heat, and for the laptop to switch to running from battery. The bad modes would include the laptop not realizing the voltage is marginal (which could cause it to start corrupting data), or the charger to overheat and cook itself... which, in the absolute worst case, could result in it failing in a way which destroys the laptop.

My conclusion: You can *probably* get away with the 6A charger. But there are absolutely no guarantees, and if it fails you have only yourself to blame. Personally, I'd suggest you do a bit more shopping to see if you can find a decently-priced charger which can supply the full 6.3A; there *must* be more models easily available via PC stores and/or the Internet.