Is the iphone X charger you used an Apple charger? If so you will be more than fine. If you want a new charging brick, go with Anker. I've had many of their stuff and never had any problem.

The AT&T store employees convinced a friend of mine to buy their chargers with the same line, said the old one would damage the new phone.

Such BS, I hate that they can straight lie and get away with it.

As long as your old charger is made by a reputable company and is not damaged it will be perfectly fine. And possibly even safer than the one they want to sell you.

However, if you do need a new charger then Anker is always my go to for charging accessories.

I have Xiaomi 20W,works like a charm.

+1 on Anker chargers. I currently use them with my 14PM, M1 12.9, & Mini 6 and used them with previous devices.

Apple chargers are cleaner… a normal transformer will convert AC to DC then lower the voltage to 5DC and thats it, call it a day.

An apple transformer will convert AC to filtered High voltage DC then it will converted back to low voltage AC and converted to filtered low voltage DC … is a double step, thats why they are expensive; and their voltage is cleaner and consistent with no spikes… smooth voltage, since the secondary transformer tells the primary to regulate voltage… you always get smooth as butter good old filtered dc power.

With that said, get apple branded.. if not, then anker or Belkin or mophie are probably the next best thing.

But in reality any transformer will do.

Even decepticons

Since the iPhone 14 series still uses a lightning port, you can use your old chargers -- they just won't charge at the maximum rate. There's nothing wrong with this, and it's arguably ever-so-slightly better for the battery. Fast charging can generate heat, and heat degrades the battery faster. Using the old chargers generates less heat. However, whether or not this makes a big difference in the long run is arguable (I'd argue that letting the battery percentage go below 20% has a bigger effect upon battery longevity).

To answer your question about chargers: any quality charger should be good. In the case of USB C, you need a 20W or larger charger but, since you have a PM, anything above 30W is wasted unless you also have something like a Macbook that can also use it.

You just need a charger that allows you to use a lightning cable. I'm still using the old charger with a USB-A port (I think it's 5W) and cord from my iphone XS, and it works fine. I also got an Anker Nano USB-C charger for times I want faster charging.

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The sales rep flat out lied to you, or was ignorant.

Either way, he was wrong.

Yes you can charge iPhone 14 with the 5w charger that came with your iPhone X.

It will be slow, but it will work.

Anker

Your iPhone X (10) charger is perfectly fine. They are just lying lol.