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Author Topic: Chargers, voltages, amps  (Read 46738 times)
RhythMick
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« on: July 03, 2011, 03:06:27 AM »

The charger which came with the S2 is rated at 5.0v 0.7a

I have other chargers rated at 5.0v but different amps and I would like to understand if they are safe to use.

My car charger is 0.5a.

The Kindle is 0.75a I think.

I also have a dock which holds the S2 vertical while charging it and also a spare battery. That has a captive USB cable designed to take power from a PC but also a micro USB so I'm powering from the S2 charger.

I have a powerbee solar charger with switchable output inc 5.0v.

I switched from Blackberry which are 0.5a.

Finally I have a world travel plug with a USB output rated at 1.0a. I tried using that to power the S2 both direct and via the dock. In both cases the touchscreen wouldn't work and I unplugged quickly.

So - is it essential that I only use the S2 charger? What about PC USB? What amps can that output? Is it ok to use chargers that are under-rated but over ?

Sorry - is this the most boring post on the forum?

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IronSingh
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« Reply #1 on: July 03, 2011, 05:26:53 AM »

I use my blackberry charger the power rating it's identical.

I don't know about the other ones.

But my nokia charger which has a very high rating works fine, but I feel uneasy as it's not good for the battery.

I also tried my kindle charger works fine but takes forever to charge so I doubt it's higher rated.

Same for usb power, it's very safe but the battery seems to get very hot.

Peace.
IronSingh

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RhythMick
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« Reply #2 on: July 03, 2011, 12:53:23 PM »

Cheers. Id like to hear from any electricians whether a higher amp rating means it could damage rhetorically phone.

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IronSingh
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« Reply #3 on: July 04, 2011, 12:39:02 AM »

First Paragraph.

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IronSingh
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goldenrave
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« Reply #4 on: October 24, 2011, 08:38:17 AM »

i need to kno this, i got a nokia charger which i saw is higher than the s2 charger, i wanted to try but im afraid it mite spoil the battery, any advise?
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IronSingh
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« Reply #5 on: October 28, 2011, 09:45:29 AM »

i need to kno this, i got a nokia charger which i saw is higher than the s2 charger, i wanted to try but im afraid it mite spoil the battery, any advise?

You want someone to say it's safe?

Well I am very sure it's safe as in the battery wont burst into flames.

Will it spoil the battery?

Well there is always wear and tear going on, and every charge you lose some charge retention. (Meaning if you battery lasted 6 hours on the very first complete charge, it will last 5.99999 hours on identical usage).

What the Nokia charger will do is speed up the wear and tear.

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mikabuc
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« Reply #6 on: November 06, 2011, 12:44:13 PM »

Li-Po (cell phone, RC car) batteries are pretty unstable when compared to NiMh/NiCd (AAs, reg Automobile) batteries.
When Li-Po's first started coming into the Remote Control Car Hobby, the big thing I was told to watch out for, and follow to a T was the charging and discharging rates, because if you neglected them, that's when the cells would swell and possibly burst into flames.

Rule of thumb is never charge at more than a 1C rate or exceed the batteries voltage, meaning if it's a 2000mAh battery, don't charge at more than 2.0A, if it's a 1750mAh battery, no more than 1.75A, and if it is a 1355mAh battery, no more than 1.355A and so on and so on.

For our stock, single cell(3.7V) Li-Po 1850mAh battery, the perfect, ideal charge rate would be no higher than 1.85A at 3.7V.
It blows me away that the stock charger is 5.0V, but Samsung obviously approved it so...Whatever.
I can almost guarantee you that our phones would never discharge at more than the batteries max rating.

To sum this up - don't charge it at more than 1.85A and 5.0 Volts and you should be fine. If you can use a charger with les voltage than 5.0V, I would use that one...

Hope this helped and didn't totally confuse,
Mike
« Last Edit: November 06, 2011, 12:51:03 PM by mikabuc » Best Screen Protector
mikabuc
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« Reply #7 on: November 06, 2011, 12:53:27 PM »

http://batteryuniversity.com/

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bayberry
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« Reply #8 on: August 29, 2012, 03:08:26 AM »

Not a charging manufacturers will not put the phone washed out 10 hours are sufficient ??dissatisfaction with the ah
Charger input: 220v 50hz 40mA
          Output: 5v-9v 500mA
Battery: 3.7v 1200mAh 4.4wh
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terrancelloyd
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« Reply #9 on: December 07, 2012, 03:00:25 AM »

A solar charger converts solar energy into electricity using the principal of photo-electric effect.
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Akhtar
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« Reply #10 on: December 09, 2012, 09:46:59 AM »

From experience, I had been using a Nokia charger for some time which had the same output but a higher amperage.

The result was that the phone would charge a lot quicker but once charger, the battery life was decreased. Using a Samsung charger would give over 24h of use whereas using the Nokia charger would give me around 13h.

After a little research I discovered that although the battery was charging and I could use the phone, prolonged use of the incorrect charger would result in the demise of the battery. I'm no electronics whizz but volts is electrical potential and amperage is the power (sounds about right but correct if I'm wrong). Charging the battery at 5V will cause no harm as that is what the battery requires but increasing the amperage that charges the battery will create a abnormal (higher) chemical reaction that will work but will decrease the life of the battery both supplying power and in general.

Again, I'm no electrical whizz so correct if I'm mistaken. This is all interpretation from memory and research.

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