When to charge your iPhone or iPad
There is a lot of myth and folklore surrounding Chargers of iOS (or in fact any device that uses technology Lithium batteries). A lot of it comes the advice given to older technologies, such as Nickel-Cadmium or Nickel-metal-hydride batteries. None of this applies to Lithium, however and some of what we "know" by NiCd and NiMH days is actually harmful to the modern battery technology.
Things to understand:
- The "charger" for an iOS device is integrated into the device. It's not the thing that plugs into the wall, and it is not the cable that connects the thing that plugs into the wall for the phone. They are just a current source and a way to do it on the phone, respectively.
- A flow completely a Lithium battery, even once, will kill him. (Unlike batteries NiCd and NiMH, where people really completely would drain to avoid the "memory effect").
- The internal charger is 'smart' - it prevents the overload device, and it will try to prevent the unit to completely drain the battery by turning off the unit until the battery is fully discharged.
- When the phone turns off at 0% it really is not equal to zero; It there's still enough fresh on the device to prevent the battery from completely flat. Similarly, 100% is not the maximum that the battery can store; It stops a little short of maximum load to prevent overload.
- The worst thing you can do is drain the battery at 0%, then not load it immediately. After having reached zero and shuts down there is a small amount of energy left, but if you leave without charge for a long time he end flat and kill the battery. So if it reaches zero, charge it soon (in hours). And never leave a phone unused for weeks or months on end without recharge periodically.
- You should only use sources of energy of high quality USB to load your iOS device. They do not have to Apple (although Apple made good), but they should never be sources USB cheapo, both because they may damage the phone and they can hurt you.
- The power source must supply at least 1 ampere to recharge an iPhone and 2 amps to recharge an iPad. Note, however, that a power source that can provide more of these values is OK to use it; the internal battery charger will be only what suits him. So, for example, you can safely charge your iPhone with an iPad USB adapt.
- iOS devices quickly cool until they reach about 75%; the rate then slows to prevent overload. Then, it will reach 75% very quickly (less than an hour), but it may take a few hours longer to reach full charge.
So what are the "rules" to the load? The simplest is fresh when you want, for a long as you want. There is no reason to drain the unit completely before recharging (in fact, it is a bad idea to do it on a regular basis), and there is no need to wait until it reaches 100% before you remove it from the power source. You can load when it is 40% and disconnect when it reaches 80%, or all other values, without hurting the phone.
The best practice, however, is to charge the phone at night, every night. It stops automatically at 100% you can't overload it doing this. So, you start the day with a fully charged phone. And, if you configure the phone for the automatic backup using iTunes or iCloud, the phone will back up every night when he has a WiFi connection and fell asleep.
Lawrence, thank you for this good information. Please can you develop on the second to the last point a little more about the statement "the power source must provide at least X amp to charge a Y". It seems that the use of less X amps to charge the device, but you say that night to the device's battery?
Tags: iPhone
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