How fast charging works and comparison with normal charging
Fast charging
Chances are that you don’t give more than a few seconds of thought each day to charging your phone. Hopefully you remember to do it before you go to bed and that s about it right but what if you wake up after a night of heavy drinking and woke up the next day realizing that you forgot to plug it in and your power bank is somewhere you don’t know? And you have to leave the house in about half an hour enter fast charging a feature supported by some modern phones and tablets. You power it up in the time it takes to take a rinse only shower, grab a bite, and get your shoes on.
The reason it takes many devices to take such a long time to charge normally is the limited amount of power many common wall chargers can push to your phone or tablet at once, Typically at 5 watts or less. This is a design choice that keeps manufacturing costs for basic low and also ensures that the relatively small batteries inside mobile gadgets wont fry from being overloaded with too much power. But in reality, many devices can handle more than this thanks to internal circuitry that sets a maximum amount of wattage that will hit your battery at one time. Fast chargers can take advantage of this by adjusting your voltage, amperage or both to deliver up to 20 watts or even higher if your devices support the technology.
You may be wondering, what technology is there that needs to be supported? We're just clobbering a battery with electrons. Well there are a lot of factors but with higher power comes higher heat so a device without enough room for the internal battery to expand might end up damaged if it gets charged too quickly. So, for that reason many companies that have developed fast charging have implemented a handshaking process between the charger and phone or tablet to make sure they are both certified to support the extra power. Samsung fast charge and one plus dash charge are both popular protocols but perhaps the most widespread one is Qualcomm quick charge which is found in a large number of android devices. So, this means that just because a charger says it supports 2.5 Amps at 5 volts doesn’t necessarily mean that it will charge your phone super-fast and there are many other factors as well. Although many devices that support fast charging do come with compatible chargers you’ll pay a premium for extra ones and you might need to buy slightly nicer cables too as cheap thin cords can’t handle the extra current very well.
Also remember that fast charging generates an extra amount of heat and may damage your battery which could negatively impact its longevity.
Fast charging is useful if you want to quickly charge a battery with significantly drained battery and you need a really quick partial charge to keep you afloat for a while. Speeds tend to taper off significantly as your phone gets closer to 100%.
Despite the drawbacks, quick chargers are excellent for one too-common scenario: when your phone is dying and you need to fill it up quickly before you leave. If charging the battery really is a genuine issue for you then buying a power bank that you always keep inside your car is also a viable option.
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