charging my phone

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nikos_gevre

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Jan 7, 2014
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i want to charge my phone with my new powerbank which has 2 usb ports to charge up to 2 devices, one is 1A and the other one is 2A. my phone is the samsung galaxy j5 2016 duos. i guess in the 2A port it will charge faster? but is it safe? my wall charger as i see is output 1.55A and also my other powerbank is 1.2A and i am charging it with no probs. can i charge my phone in the 2A port or i will have problems?
thanks!
 
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You will be fine charging your phone of the 2 Amp port. That would be the fastest way to charge it. The 2 amp is the max draw from that port. Like a house outlet they are all 15 Amp or 20 Amp max. The charge controller software on the phone determines the charge rate it handle. It watches the battery temp and the charging hardware. It is limited by the supply side current available, cord length, and cord size. The supply side can only supply so much before its internal hardware get to hot and is damaged. Usually what happens the phone will draw as much current as it can till the voltage starts to drop and stabilizes at that current draw. Shorter USB cord have less resistances like 12" vs 36" cord will charge much faster. The...
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Dunlop0078

Dunlop0078

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Feb 13, 2014
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My powerbank also has 2A and 1.2A ports I mostly use the 1.2A port unless im in a rush. The battery is unlikely to outright be damaged by using 2A but it can negatively impact the lifespan of the battery if you use it everytime you charge your phone.
 
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Phillip Corcoran

Phillip Corcoran

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Sep 7, 2013
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The 1 amp USB port is for charging phones, the 2 amp is for charging tablets.

However, using the 2 amp port to charge a phone will do no harm, it will just charge it up faster, but may shorten the life of the phone battery, that's why the powerbank has a 1 amp port for those people who are in no rush and wish to take proper care of the battery.

Some phone owner's don't care about battery lifespan, they just want to get it charged as quickly as possible.
That's fine if the battery is replaceable, but on many modern phones the battery is built in, so when the battery gets to end-of-life the entire phone has to be replaced.

 
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Matt_Swanson

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Aug 20, 2016
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You will be fine charging your phone of the 2 Amp port. That would be the fastest way to charge it. The 2 amp is the max draw from that port. Like a house outlet they are all 15 Amp or 20 Amp max. The charge controller software on the phone determines the charge rate it handle. It watches the battery temp and the charging hardware. It is limited by the supply side current available, cord length, and cord size. The supply side can only supply so much before its internal hardware get to hot and is damaged. Usually what happens the phone will draw as much current as it can till the voltage starts to drop and stabilizes at that current draw. Shorter USB cord have less resistances like 12" vs 36" cord will charge much faster. The size the USB wire has the same effect. Smaller the AWG the bigger the wire. Bigger wire can carry more current thus the faster it will charge. Most USB cable are 28/28 AWG. The first is data wire size and the second is the power wire size. Nicer cables like 28/24 AWG are faster and i found a 28/21 AWG cable on amazon that are the best. So a phone that can draw 1.5A off a 2A charger with a 32" cord 28 awg wire might draw 2 Amps. It might take 6 hours to charge. The phone will see only like 1 amp or less charging and the the other amp will be lost in heat in the cord due to reticence. With a 2 amp charger and a 6" 21 Awg cord the phone will take like 2 hours to charge. A .5A to .75A supply wall charger could even extend the charge time to like 12 hours. Faster charging should not effect total battery life. You would have to have way more current avablie to harm the battery from heat. The charging hardware on the phone will protect the battery from damage. Just do a quick google search on the new fast charging phones that boast the voltage to get more curent to the battery. https://www.qualcomm.com/products/snapdragon/quick-charge/faq
 
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