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Charge time with 1.0 amp charger

syntrix

Android Expert
FWIW, the charge times here are with the stock .750 amp charger 0-100%

AnandTech - Motorola Droid RAZR MAXX Review - 1.8x The Battery

4.217 hours

I just drained as far under 5% as I could and then put it on a 1.0 amp charger, pretty darn close to fully discharged.

4.217 *.75 = 3.16 hours.

It took just under 3 hours to charge to 100% :D

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So either battery stats was presenting less battery power, or the internal charging circuit in the phone can utilize a 1.0 amp charger, yay!
 
myself, the engineer is coming out in forums tl;dr.

1.0 amp charger, chargers faster, yay! Stock is .75 amps.
 
HP Touchpad 2.0 amp would be the best :)

I've got one, but why excite the the battery more than it needs, could lead to a puffy battery.
 
Is it safe to use a different charger because the battery is a higher voltage?

No. Wrong way of looking at it. Think.... the batteries only drain/charge so fast.... drain/charge up to a certain "speed" and your batteries will get puffy and weak or non-working.

Typically smartphones have internal charging circuits that allow the phones to charge only so fast, depending on how hard you are stepping on the gas (amps).
 
Typically smartphones have internal charging circuits that allow the phones to charge only so fast, depending on how hard you are stepping on the gas (amps).

That's what I was going to ask. My car charger is a dual-USB outlet 2.1 amp, my charger at work is 1 amp, and my stock charger at home is 700 miliamps. Does using a higher amperage charger charge the battery any faster, but it appears by this post that it does not. I do charge both my DRM and my daughters DX from the same charger in the car though!
 
That's what I was going to ask. My car charger is a dual-USB outlet 2.1 amp, my charger at work is 1 amp, and my stock charger at home is 700 miliamps. Does using a higher amperage charger charge the battery any faster, but it appears by this post that it does not. I do charge both my DRM and my daughters DX from the same charger in the car though!

Did you not read my second (non-enginerd) post. Yes, a 1.0 amp charger will charge faster than a 0.75 amp charger.

I'll bet a 2.0+ amp charger would work, but I'll bet it won't charge 2x as fast.

edit: the open question is, "How many amps is the ceiling on the internal circuit?"
 
No. Wrong way of looking at it. Think.... the batteries only drain/charge so fast.... drain/charge up to a certain "speed" and your batteries will get puffy and weak or non-working.

Typically smartphones have internal charging circuits that allow the phones to charge only so fast, depending on how hard you are stepping on the gas (amps).

Thanks for the info!
 
Did you not read my second (non-enginerd) post. Yes, a 1.0 amp charger will charge faster than a 0.75 amp charger.

I'll bet a 2.0+ amp charger would work, but I'll bet it won't charge 2x as fast.

edit: the open question is, "How many amps is the ceiling on the internal circuit?"

Yep, I read it, brain fart. I don't think the 2.1 charges twice as fast as the 1 amp. At least it certainly doesn't seem to.
 
It Doesn't matter the amperage output of the charger as far as overloading the circuit, because the circuit will only pull the most it can pull and if you have say a 10A charger the phone will only pull the most it was designed to pull, chargers don't force out amps only volts they "give" out amps.... now overloading the voltage, that will cause some damage....

either way it seams to be a very low limited amperage on the stock charger especially since they are allowing for two devices to be hooked up!
 
So your saying I can use my iPad 2 plug? On it says Output:5.1V 2.1A I used this with my iPhone 4 but going back to android and haven't really tried this on my phone... I not willing to mess something on my phone till I know
-Thanks
 
I take no liability for anything ;) haha, But I can say I have charged my phone with a DC power supply, at work with no charger, with about a max of 50A output and variable voltage. I set the voltage to 5.1 and it pulled the amps it needed, no damage done... the meter is not too precise, but it was around 1A
 
where does the stock charger say .75 amp (or 750 mA)

I ask because I couldn't read it and that's the first thing I looked for. Wonder it that is equal for both plugs?

The old DX charger ws 950mA (or .95). And most car chargers are rated at 1A, or 1000 mA.

Mine is - works very well with the maxx. Haven't been on a long road trip with it yet, though.
 
Says so right on the charger, on the plug side, printed in small print at the bottom.

How could you have missed that? /sarcasm :D:D

It's really tiny print!
 
Parsing through the Android system logs, I've noticed that BATTD displays the following information:

Minimum voltage before poweroff: 3050mV
Maximum voltage before charger disconnect: 4350mV
Charging current: 1850mA

This means that the phone could make use of a 5.1V charger with ~1.5A output. Anything higher would not be utilized.
 
Parsing through the Android system logs, I've noticed that BATTD displays the following information:

Minimum voltage before poweroff: 3050mV
Maximum voltage before charger disconnect: 4350mV
Charging current: 1850mA

This means that the phone could make use of a 5.1V charger with ~1.5A output. Anything higher would not be utilized.

How do you determine this?
 
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