Android charging - technical question

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gzt

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#166102 2-Mar-2015 21:32

I have a Motorola G2. It is an excellent general purpose phone.

The supplied charger is a Motorola 750ma output and Android estimates approx 1.3 hours to charge the device from flat. I have a genuine Motorola car charger with similar 750ma output.

I also have a Samsung charger with 2A output and Android estimates closer to 1 hour to full charge, and an aftermarket generic car charger giving a similar figure. That one is useful because it supports more than one device.

Are there good reasons the supplied chargers are lower output? Am I doing any damage or compromising the battery lifetime when I use the more powerful chargers?

Batman

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#1249869 2-Mar-2015 21:38

should be fine. i believe the ROM has a max current and it won't charge faster than what the ROM allows ... I THINK

richms

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#1249873 2-Mar-2015 21:42

The phone dictates the max current it will charge at. the rating on the charger is just the limit that the voltage will either sag at, or it blows up in the case of some stupid aftermarket iphone chargers.

If the phone is charging too fast, then it is the phones fault not the charger, the only time chargers will provide too much voltage is if they are junk unregulated china special ones, or if they are ones that negotiate it with the device, which quickcharge 2.0 ones do and then step the voltage up to either 9 or 12 to let the phone get more watts over a crappy USB connection.

Richard rich.ms

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#1249875 2-Mar-2015 21:44

my dad's ipad exploded when charged with a cheap china socket unit.

gzt

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#1250395 3-Mar-2015 16:07

Thanks for the quality answers!. J97 I looked into it it appears there are four standard levels, ie; not just any integer.

Related article on charge time and battery life.

I might assume Motorola engineers have selected the optimum charge level equipment for that issue but give the consumer the option to achieve parity with other devices.

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#1250403 3-Mar-2015 16:37

I found the G2 a bit fickle with I think a blackberry charger, was 750mA but wouldn't charge properly, especially when flat, the stock charger was not a problem, these days it gets charged on a 2A charger with no problems, it will only take what it can

1101

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#1251552 5-Mar-2015 10:35

gzt: Thanks for the quality answers!. J97 I looked into it it appears there are four standard levels, ie; not just any integer.

I might assume Motorola engineers have selected the optimum charge level equipment for that issue but give the consumer the option to achieve parity with other devices.

Ah no. Dont believe marketing hype by some developer.
Also , estimated charge time is just that, a software estimate.
I would worry about it, just plug it in & let the ph do its own thing :-)
The charge rate is set by the ph design engineers .

Charge rate CAN be anything, any integer. 1C, 1.5C, 2C etc etc . Only dependent on the batt itself, what the batt manufacturers recommend for that batt & how much the ph designers want to push their luck with charge rates.

better info here
http://batteryuniversity.com/

bazzer

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#1251856 5-Mar-2015 17:52

1101: Charge rate CAN be anything, any integer. 1C, 1.5C, 2C etc etc . Only dependent on the batt itself, what the batt manufacturers recommend for that batt & how much the ph designers want to push their luck with charge rates.

1.5 is not an integer, right? :)