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While iPhones don't need to be charged overnight, the two to three hours they need to fully charge in the middle of the day can take too long. Charging can be accelerated in the following ways:

Using a charger with a higher output

The most effective way to increase iPhone charging speed is to use an iPad charger, which is the procedure Apple approved. Included in the packaging of iPhones are chargers with a voltage of five volts per one amp of current, so they have a power of 5 watts. However, iPad chargers are capable of delivering 5,1 volts at 2,1 amperes and have a power of 10 or 12 watts, more than twice as much.

This does not mean that the iPhone will charge twice as fast, but the charging time will be significantly reduced - according to some tests A 12W charger charges an iPhone in more than a third less time than a 5W charger. The charging speed depends on the amount of energy in the battery at which it starts charging, because the more energy the battery already contains, the slower it is necessary to supply more.

With a more powerful charger, the iPhone reaches 70% charged battery in almost half the time than with the charger from the package, but after that the charging speed differs significantly less.

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Turning off the iPhone or switching to flight mode

The following tips will only give you a very small boost in charging, but they can be useful in extreme cases of time constraints. Even when the iPhone is charging and not in use, it still consumes power to maintain a connection to Wi-Fi, phone networks, update apps in the background, receive notifications, etc. This consumption naturally slows down the charge - more so the more active the iPhone is.

Turning on low-power mode (Settings > Battery) and flight mode (Control Center or Settings) will limit the activity, and turning off the iPhone will completely minimize it. However, the effects of all these actions are rather small (recharge speed increases by units of minutes), so in most cases it may be more useful to stay on the reception.

Charging at least room temperature

This advice is more about general battery care (maintaining its capacity and reliability) than noticeably speeding up its charging. Batteries heat up when receiving or releasing energy, and at higher temperatures their potential performance decreases. Therefore, it is better not to leave the device in direct sunlight or in a car during summer when charging (and at any other time) - in extreme cases, they may even explode. It may also be appropriate to take the iPhone out of the case when charging, which can prevent heat dissipation.

Sources: 9to5Mac, Scrubly
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