If you want the fastest battery charge possible for your phone, you need the charger that supplies as many watts as your phone can handle at once. Most of the time—but not always—the charger that came bundled with your phone will fit the bill.
When it comes to "fast charging," this is a technology that different manufacturers adopt in different ways, and the standards usually don't cross over between brands. The latest OnePlus 8T, for example, supports 65-W fast charging—it basically splits the battery up into two internally and charges both halves simultaneously.
As with normal charging, to get the best results from fast charging you need both the charger and the phone to support it—you can't just plug the OnePlus 8T into any charger and see that full 65-W speed charging.
Wireless charging is a little bit different. Again, you'll see the charging speed measured in watts, though wireless chargers are slower than the wired versions. Fortunately, just about everyone has now adopted the Qi wireless charging standard, so you can plonk your phone down on any model you like. Speaking of which …
What Charger Can I Use?
As long as you're using the right cable or the right wireless standard (and it's difficult not to), you can use just about any charger with your phone. Modern-day handsets will regulate the power draw to keep the battery protected, so there's no danger of blowing up your phone by using a charger that's too powerful for it.
That said, be wary of using cheap, no-brand chargers, or chargers that have been sitting around for years, as they may not necessarily stick to the same safety standards as the rest. We're not saying all of these chargers are dodgy, but to be safe it's always worth going with a newer charger from a reputable manufacturer or accessories maker, even if it's a little bit more expensive.
The bottom line is that while just about any new-ish charger will work with just about any new-ish phone at this point, you won't necessarily see the maximum charging speeds or the most efficient charging rate if you're not using kit made by the same company.
As we alluded to above, this is particularly true when it comes to fast charging, as phone makers like to deploy their own standards and methods—for the maximum fast charging rates, you'll usually need to plug in the charger specifically made for your phone. Use other chargers if you need to, but the official charger when you can.
The new iPhone 12 phones support MagSafe wireless charging.
Photograph: Apple
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