# Galaxy Note 3 - Max Charging Current

• 12-27-2013, 05:52 AM
Man In Black 805
Galaxy Note 3 - Max Charging Current
Will the Note 3 charge any faster than 1200maH? I've tried multiple chargers / cable combo's including 2.1 amp versions and the max charging rate I can get according to my Galaxy Charging Current app is 1200maH, that's the same as 1.2 amp right? So a 2.1 amp charger or above is pointless correct?
• 12-27-2013, 06:10 AM
NothingIsTrue
Re: Max Charging Current
I'm under the impression that the max speed is 2000 mAH for this device. I've seen several people say they average around 1800 mAH for the full cycle, but phones don't charge at a constant rate, but increase/decrease power draw dynamically throughout the charge and the max speed is governed by the lesser of the maximum the circuit inside the device and the throughput of the charging cable and the output of the actual charger (if separate).

Edit: Found out that the device governs itself at 1200mA while the screen is on (of power pushed into the battery storage).
• 12-27-2013, 06:14 AM
Man In Black 805
Re: Max Charging Current
Quote:

I'm under the impression that the max speed is 2000 mAH for this device. I've seen several people say they average around 1800 mAH for the full cycle, but phones don't charge at a constant rate, but increase/decrease power draw dynamically throughout the charge and the max speed is governed by the lesser of the maximum the circuit inside the device and the throughput of the charging cable and the output of the actual charger (if separate).

Well, how are they measuring it? The only way I know how is through that app I mentioned, and I never see anything higher than 1200maH even using my Ventev 2.1 amp charger & cable, how can you tell if it's charging at 1800mah?
• 12-27-2013, 06:29 AM
FBA
Re: Max Charging Current
You can do a hand calculation --

If the wall charger has a 2.1 amp hour charge capacity...add a 25% loss on that and it means it would deliver 2.1 amps less 25% (per hour); in other words, 1.575 amps per hour. The phone battery is 3.2 amps. It will charge a battery from 0-100% in a hair over 2 hours...and it does exactly that. Effectively, you would see it charge between 1.25-1.8 amps at any time, which is what I see.

If you use a 1.2 amp charger, it will just take longer. You need a 2.1 amp charger to get full charging speed.
• 12-27-2013, 06:41 AM
NothingIsTrue
Re: Max Charging Current
If you're using this app: [Only registered and activated users can see links. Click Here To Register...] it says:

Compatibility list:

- Most Galaxy S4 models.
- International Samsung Galaxy S3 (GT-I9300 and GT-I9305).
- South Korean Samsung Galaxy S3 (SHV-E210K/L/S).
- International Samsung Galaxy Note II (GT-N7105).
- Verizon Samsung Galaxy Note II (SCH-i605).

It may also work on other devices, but such is not guaranteed.

[Only registered and activated users can see links. Click Here To Register...] (Battery Monitor Widget) is one I have used before and it does list the Note 3, however Samsung devices have notoriously been difficult to measure voltage on because of something they and I think Moto do differently in kernel integration.

More info from XDA: The stock charger (2A) will charge 1800 mA while in standby (the screen is off) and 1200 mA while the screen is on. In addition, the phone is drawing another 200 mA while in standby to power the device while it charges at 1800 mA and 800 while on (just the delta from 2A). So your battery monitor is probably right, that aside from what it allocates to device power (800mA), it's netting 1200mA. Devices also charge faster up to 50% than they do when above 50%. Anything above 2A (2.1A, 10A, etc) will still be governed at the 2A that the device supports.

If these numbers are correct, you should be able to take your (100% - battery level %)*battery capacity/(1.8A or 1.2A, depending on if on or off) = theoretical charge time in hours. Divide that by roughly 80% and that should be your total charge time, give or take a reasonable margin.
• 12-27-2013, 05:59 PM
Gator352
Re: Max Charging Current
Wow. Never have I seen a thread get so technical about max charging amps and etc.