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- 27 Jan 2008
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I know there is a series of USB types and the charge time is controlled by many things, the USB outlet, the lead, and the item being charged.
I must have at least 20 USB leads which will connect my phone or tablet to a USB outlet, the 13A sockets with USB are clearly marked 2.1 amp for example, but car chargers and plug in chargers often either not marked or so small I can't read it.
So I plug my tablet into my desk top and it says 16.5 hours to fully charge and already 75% charged, move it to 13A socket with USB outlet marked 3.1 A for pair (only one outlet used) and the reported time drops to 14.5 hours within 5 minutes, 1/2 hour latter it's fully charged.
Reasonably sure the lead I was using was genuine Samsung and clearly with that lead and 3.1 Amp per pair it is fast. Even the wall sockets vary from 2.1 A a pair to 3.1 A a pair to 4.2 A for a 4 USB socket outlet, rare that I use a wallwart type, one I have just looked at is 800 mA.
I know the flat red lead which came from Pound World is slow, and the Samsung lead is fast, however most the leads not a clue which are fast and which are slow.
Is there a way to test to find out which are which leads and USB outlets? Clearly the report on the Samsung tablet was wrong, 14.5 hours and then fully charged in 1/2 hour. Is there an app or something which will actually tell you the charge rate?
Is there in real terms any difference between 2.1 A and 3.1 A and 4.2 A marked on a USB outlet with just one lead plugged in? Or does the lead limit the output anyway?
In the main I am not in a hurry, phone and tablet is charged over night, but when I am in a hurry, need to know which are slow and which are fast leads and USB outputs.
I must have at least 20 USB leads which will connect my phone or tablet to a USB outlet, the 13A sockets with USB are clearly marked 2.1 amp for example, but car chargers and plug in chargers often either not marked or so small I can't read it.
So I plug my tablet into my desk top and it says 16.5 hours to fully charge and already 75% charged, move it to 13A socket with USB outlet marked 3.1 A for pair (only one outlet used) and the reported time drops to 14.5 hours within 5 minutes, 1/2 hour latter it's fully charged.
Reasonably sure the lead I was using was genuine Samsung and clearly with that lead and 3.1 Amp per pair it is fast. Even the wall sockets vary from 2.1 A a pair to 3.1 A a pair to 4.2 A for a 4 USB socket outlet, rare that I use a wallwart type, one I have just looked at is 800 mA.
I know the flat red lead which came from Pound World is slow, and the Samsung lead is fast, however most the leads not a clue which are fast and which are slow.
Is there a way to test to find out which are which leads and USB outlets? Clearly the report on the Samsung tablet was wrong, 14.5 hours and then fully charged in 1/2 hour. Is there an app or something which will actually tell you the charge rate?
Is there in real terms any difference between 2.1 A and 3.1 A and 4.2 A marked on a USB outlet with just one lead plugged in? Or does the lead limit the output anyway?
In the main I am not in a hurry, phone and tablet is charged over night, but when I am in a hurry, need to know which are slow and which are fast leads and USB outputs.