Develop Bugs

Highest output car charger

Is this the highest?
http://www.seidioonline.com/product-p/pmc.htm
Post links if you know of higher ones, thank you.
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There are 2.1A usb adapters, but I don't think microUSB can take advantage of it. The one you linked is a 1A, which is the same as the wall charger HTC gave with the phone. I'm currently using a 1A usb adapter in my truck.

Ok that's probably what I'm looking for then. Are there wall chargers greater than what came with the phone that I can take advantage of?

Your best bet would be to try the USB adapters made for iPads. The Apple products can utilize the 2.1A chargers with their sync cables, but I'm not sure if a microUSB cable can though. I have some 2.1A wallchargers from some of my Apple products, I'll test them later and let you know what I find out.

http://www.verizonwireless.com/b2c/...ryDetails&archetypeId=12299&accessoryId=46370

I just got an Enercell from Radio Shack with dual usbs. Max output is 2.5A divided between the two ports.
http://www.radioshack.com/product/index.jsp?productId=11329448
on sale now for only $14.99. Seems to be of good quality.

The Motorola rapid chargers rock.

Guys, unless you mod the usb adapter 5V spec, you aren't doing squat with a "high power" adapter. The device has an input impedence that will draw a certain amount of current at 5v., and that's it.
Standard battery: 1400 mAh
Time to charge: 4 hrs (according to manual)
That's 1400/4 = 350 mA.
Most adapters on the market spec more than that, they're usually 500 mA or above. And again, unless you boost the volts, you're not going to be able to push more than 350 mA or so.
So don't waste you're money.
On the other hand, if your going to share a car outlet with another device like mp3 or ipod, then yeah, you'll need a higher output, two port, adapter.
Edit: It just occurred to me that if you're using the phone heavily while charging, then yeah you may need more than 500 mA. My currrent widget shows the phone can draw another 250 mA or so during use. That plus the charge totals to around 600 mA. But depending upon design, the phone may not be able to pull in all 600 mA. A test with a current meter would be real interesting.

The charger shipped with the Thunderbolt is a 1 Amp charger.
If I use a 500 mA charger the Current Widget shows a +450mA charge current. However if I use the 1A charger, I get a charge current of about +850mA.
Given that the google navigation gobbles over 400mA when running, you need a car charger with greater than 500mA capacity of you want the phone to charge at the same time.
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boingboingbilly said:
The Motorola rapid chargers rock.
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Good to hear, I ordered one today for $11 on ebay. I had heard other people say they liked that one too.

Ecomaniac said:
Guys, unless you mod the usb adapter 5V spec, you aren't doing squat with a "high power" adapter. The device has an input impedence that will draw a certain amount of current at 5v., and that's it.
Standard battery: 1400 mAh
Time to charge: 4 hrs (according to manual)
That's 1400/4 = 350 mA.
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You're making the incorrect assumptions that the charging rate is constant, and charging is 100% efficient. Li-ion batteries can be charged at up to a 1C rate (i.e. 1.4A for a 1400 mA cell). Add the power drawn by the phone itself, and a 1.8 Amp charger might not be unreasonable (1.8 A is the specified limit for micro USB connectors). Whether the phone will actually do a maximum rate charge, I don't know.
This, from a TI Application Note (Google for SLAA287, board won't let me post links):
A Li-Ion battery charging process consists of three stages:
· Slow Charge: Pre-charging stage using current of 0.1C
· Fast Charge: Constant current charging stage using current of 1C
· Constant voltage charging stage
During the slow charge stage, the battery is charged with a constant low charge current of 0.1C, if the battery voltage is below 2.5V. The slow charge stage is rarely used during the charging process of a Li-Ion battery.
The fast charge (constant current) and constant voltage charging are the most important stages during a recharge process. Most Li-Ion batteries have a fully charged voltage of 4.1 or 4.2V.
The battery is first charged with a constant current of 1C until a battery voltage reaches 4.1 or 4.2V. The firmware continuously checks the charging current by sensing the voltage at the current sense resistor (Rsense) and
adjusts the duty cycle of PWM output from the MCU. The battery's voltage is checked frequently.
Whenever found the battery's voltage reaches 4.1 or 4.2V, the charger will switch to constant voltage charging mode. The battery is then charged with a constant voltage source at a fixed battery voltage of 4.1 or 4.2 V...When the charging current falls below 0.1C, the charging process must stop.
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Monoprice has Cig to USB(1A) chargers and the USB to Micro cables in multiple lengths(I ordered 6' ones) for far cheaper than you will find anywhere else

mike.s said:
You're making the incorrect assumptions that the charging rate is constant, and charging is 100% efficient. Li-ion batteries can be charged at up to a 1C rate (i.e. 1.4A for a 1400 mA cell). Add the power drawn by the phone itself, and a 1.8 Amp charger might not be unreasonable (1.8 A is the specified limit for micro USB connectors). Whether the phone will actually do a maximum rate charge, I don't know.
This, from a TI Application Note (Google for SLAA287, board won't let me post links):
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very useful, thanks!

walbuls said:
Monoprice has Cig to USB(1A) chargers and the USB to Micro cables in multiple lengths(I ordered 6' ones) for far cheaper than you will find anywhere else
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I second monoprice.

I tried bunch of cig to usb car charger and none matched advertised output... They all showed Charging (USB). I now use AC inverter and it charges just like a wall charger.

eccenpix said:
I tried bunch of cig to usb car charger and none matched advertised output... They all showed Charging (USB). I now use AC inverter and it charges just like a wall charger.
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I suspect you need to find one which properly follows the USB Battery Charging Specification. That link is to the most recent version, which came out on 7Dec2010 (remember Pearl Harbor!). Version 1.1 is easier - a Dedicated Charging Port is indicated by shorting together the data lines (the two middle conductors on a full sized USB connector. By doing so, it indicates the device may try to draw up to 1.8 A of current (although a dedicated charging port is allowed to limit the current to less than that, it must provide at least 1.5 A).
I bought a cheap USB hub with 5 ports, used an exacto knife to cut the traces going to the data lines (the middle two) on all the ports, and then shorted them together on each port. It's now no longer a USB hub, but a USB charger with 5 ports I can used to charge stuff (phone and Bluetooth, quite often). The AC adapter which it came with does 2 Amps. My Thunderbolt says "Charging (AC)" when plugged into it.
So, if you can open up one of your adapters, just solder a jumper between the middle two contacts (make sure they're not connected to anything else).

Just got the Rocketfish premium microUSB at Best Buy and it has a captive coiled cord and a USB port. TBolt says "AC plugged" and reads +670 mA.

Good choice on the Motorola Rapid Charge - I've burned through 3 other cheap car chargers trying to keep my phone alive while using Google Nav and this is the first one to work!

i have the rapid motorola one on amazon

lippstuh said:
i have the rapid motorola one on amazon
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+1 Works great! Battery widget usually shows about +800mA while only charging. Real close to the wall charger

[Q] Using high amp charger

just wondering if it's safe to use my hp touchpad charger on the gio
Wall AC to USB power adapter, which has input specifications of 100-240 Volt 50–60 Hz 0.4 Amp AC, and output specifications of 5.3 Volt 2.0 Amp DC. It is cylindrical roughly the size of a "D" battery with a foldable 2-prong AC connector and Standard-A USB socket on its two ends.
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pretty high amperage, is it safe to charge with it? done it twice already

Standard charger have 5V output and 0,7A out. I do not recommend the use of higher voltages and currents, can lead to overcharging and thus the explosion.

The internal "censor" of the cell can and wil be fried wen you continue.
0.7 vs 2.0 is about 3 times faster, truth but also a bigger ammount in a shorter time.
If the cell not capable for that, it wil overheat and at worst case it wil blow up in your face...................
And take a second gues, those are not the most expensive celles.............

will charge battery faster if phone shut down? and how does FAST CHARGE work ??

as we know , for example the wall charger has output of 1A.
and battery capacity is 1750 mAh , so in theory , it should be 100% charged in 1750 mAh / 1000 mA = 1.75 hours.
but consider something like cable resistance or whatever , i think it should be fully charged like 2.5 hours or so ...
but what strange is, i have an old wall charger which was come from with Nexus S , only has 700 mA output and the new one came with Galaxy Nexus which has 1 A output. but my application , DX power booster , charge estimated time shows exact same with both 700 mA and 1 A ... i just don't get it as they have different output current ...
and i think , when charger is plug in, phones runs on power source directly from charger which will decrease the current goes to battery i think , so will the battery charging be short if i shut down my phone when it charges ?
and as for a USB , 5 V and 0.5 mA , which is only half of wall charger , then why does FAST CHARGE will make it as shortly as wall charger ?
because i think , no matter it is on or off , it doesn't alternate the fact that USB still only has 500 mA output ...
maybe they are stupid questions ... but i just failed my physics back the time i was student ...

My Gnex charges WAY faster when it's turned off. A few times I've left the house and realized I forgot to charge my phone overnight so I turn it off, put it on the car charger and usually have a useable charge even if it's a fairly short trip.

If you're phone is off, it's not using the power it's getting from the charger, therefore it will reach 100% faster
Sent from my Galaxy Nexus using xda premium

qtwrk said:
as we know , for example the wall charger has output of 1A.
and battery capacity is 1750 mAh , so in theory , it should be 100% charged in 1750 mAh / 1000 mA = 1.75 hours.
but consider something like cable resistance or whatever , i think it should be fully charged like 2.5 hours or so ...
but what strange is, i have an old wall charger which was come from with Nexus S , only has 700 mA output and the new one came with Galaxy Nexus which has 1 A output. but my application , DX power booster , charge estimated time shows exact same with both 700 mA and 1 A ... i just don't get it as they have different output current ...
and i think , when charger is plug in, phones runs on power source directly from charger which will decrease the current goes to battery i think , so will the battery charging be short if i shut down my phone when it charges ?
and as for a USB , 5 V and 0.5 mA , which is only half of wall charger , then why does FAST CHARGE will make it as shortly as wall charger ?
because i think , no matter it is on or off , it doesn't alternate the fact that USB still only has 500 mA output ...
maybe they are stupid questions ... but i just failed my physics back the time i was student ...
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wall charging is only faster because your phone is not using battery while charging, so of course it would take a shorter time to reach full battery, thus appearing to charge 'faster'.
Fast charge is fooling the phone into thinking your charging from a wall socket instead of a usb, as when in usb mode it uses some of the power to transfer files between the phone and computer, so when in fast charge mode it only charges and cant be used to transfer files. this is from what i understand so far

vincentistan said:
wall charging is only faster because your phone is not using battery while charging, so of course it would take a shorter time to reach full battery, thus appearing to charge 'faster'.
Fast charge is fooling the phone into thinking your charging from a wall socket instead of a usb, as when in usb mode it uses some of the power to transfer files between the phone and computer, so when in fast charge mode it only charges and cant be used to transfer files. this is from what i understand so far
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But what I don't understand is, no matter you transfer files or not, it doesn't alternate the fact that USB output is still 500 mA...
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When you activate Fast charge you fool the USB port to think it doesn't have a communication device attached, and thus can deliver up to 1.5A on the port (dependent on port type). The phone charges faster when turned off because it doesnt use any power itself. The charging board on the phone will always control how much current you can recieve at all times (even when off).
Taken from Wikipedia.
Charging ports and accessory charging adapters
The USB Battery Charging Specification of 2007 defines new types of USB ports, e.g., charging ports.[46] As compared to standard downstream ports, where a portable device can only draw more than 100 mA current after digital negotiation with the host or hub, charging ports can supply currents above 0.5 A without digital negotiation. A charging port supplies up to 500 mA at 5 V, up to the rated current at 3.6 V or more, and drop its output voltage if the portable device attempts to draw more than the rated current. The charger port may shut down if the load is too high.
Charging ports exist in two flavors: charging downstream ports (CDP), supporting data transfers as well, and dedicated charging ports (DCP), without data support. A portable device can recognize the type of USB port from the way the D+ and D- pins are connected. For example, on a dedicated charging port, the D+ and D- pins are shorted. With charging downstream ports, current passing through the thin ground wire may interfere with high-speed data signals. Therefore, current draw may not exceed 900 mA during high-speed data transfer. A dedicated charge port may have a rated current between 0.5 and 1.5 A. There is no upper limit for the rated current of a charging downstream port, as long as the connector can handle the current (standard USB 2.0 A-connectors are rated at 1.5 A).
Before the battery charging specification was defined, there was no standardized way for the portable device to inquire how much current was available. For example, Apple's iPod and iPhone chargers indicate the available current by voltages on the D- and D+ lines. When D+ = D- = 2V, the device may pull up to 500 mA. When D+ = 2.0 V and D- = 2.8 V, the device may pull up to 1000 mA of current.[47]
Dedicated charging ports can be found on USB power adapters that convert utility power or another power source — e.g., a car's electrical system — to run attached devices and battery packs. On a host (such as a laptop computer) with both standard and charging USB ports, the charging ports should be labeled as such.[46]
To support simultaneous charge and sync, even if the communication port doesn't support charging a demanding device, so called accessory charging adapters are introduced, where a charging port and a communication port can be combined into a single port.
The Battery Charging Specification 1.2 of 2010 [12] makes clear, that there are safety limits to the rated current at 5 A coming from USB 2.0. On the other hand several changes are made and limits are increasing including allowing 1.5 A on charging ports for unconfigured devices, allowing high speed communication while having a current up to 1.5 A and allowing a maximum current of 5 A.
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1A or 2.1 A?

So, I have powerbank and I have 2 ways of charging: 1A and 2.1A. which one to use when charging my note 2?
Handwritten from my Note 2

Depends on the cable you'd use. Samsung cable will go near 2amp, generic ones do about 1 amp

kebabs said:
Depends on the cable you'd use. Samsung cable will go near 2amp, generic ones do about 1 amp
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I have samsung cable.. So is it smart to charge via 2.1 A ? Can it do some damage on the phone ?

I have a Momax external battery and have charged the phone with the 2.1A port. It didn't heat up, it didn't have any problems. I was planning on measuring the exact amperage that comes out of the samsung charger and the momax battery (iPower Pro), but I didn't get around to it, because I suspect the difference is actually smaller. There are many people who used more powerful chargers to charge their phones faster, and the only thing that degraded was the battery lifespan, but the difference in those cases was upwards of 0.5A between the original and the new charger. I find the 0.1A to be a small difference and I have no problem using the 2.1A port on the iPower.
So to answer your question, no, it won't damage your phone. Theoretically it damages your phone's battery, but it degrades anyway due to charging cycles, so you won't notice any damage caused by the extra 0.1A unless you plan on still using the note 2 10 years from now.

sandulea said:
I have a Momax external battery and have charged the phone with the 2.1A port. It didn't heat up, it didn't have any problems. I was planning on measuring the exact amperage that comes out of the samsung charger and the momax battery (iPower Pro), but I didn't get around to it, because I suspect the difference is actually smaller. There are many people who used more powerful chargers to charge their phones faster, and the only thing that degraded was the battery lifespan, but the difference in those cases was upwards of 0.5A between the original and the new charger. I find the 0.1A to be a small difference and I have no problem using the 2.1A port on the iPower.
So to answer your question, no, it won't damage your phone. Theoretically it damages your phone's battery, but it degrades anyway due to charging cycles, so you won't notice any damage caused by the extra 0.1A unless you plan on still using the note 2 10 years from now.
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Thanks for reply mate ! I was thinking the same, but i needed some sort of confirmation tho

Use the 2.1A one.
The phone should only draw 2A from it anyway, that just means the port is capable of supplying 2.1A.
Using the 1A port will just charge your phone slowly, the 2.1A port should charge it as quick as the official charger, depending on which cable you use.

It is a matter of supply and demand. All USB devices can safely be plugged into any USB charger. Given an unlimited amount of current available from the charger, each device will still only draw only as much current as it is designed to draw. If the charger is rated 2.1 Amps or 5 Amps or 10 Amps, a 1.5 Amp device will still only draw 1.5 Amps. The charge rate will be at maximum Think of it like your house wiring. The circuit may have a 20 Amp circuit breaker in the basement but we plug in 40 Watt bulbs and 100 Watt bulbs and TVs and electric shavers that all draw different amounts of current. The 100 Watt bulb uses less than an amp but is unharmed being plugged into a 20 Amp receptacle (charger). Now we come to the flip side. If the charger Is rated lower than the device it just charges slower than it would if the charger could supply at least as much as the device uses. To go back to our example, the 1.5 Amp device plugged into a 1 Amp charger will take longer to charge that it would with a charger rated 1.5 Amps or higher. My analogy has one hole. If the stuff plugged into the house receptacles exceeds 20 Amps the circuit breaker pops. This will not happen with USB chargers as they limit the current and will not try to supply more than they are rated for. Stick to chargers rated as high as the one that came with your device or higher and you will be fine

Any indication that Quick Charge 2.0 is active?

Is there any kind of indication on the phone that Qualcomm quick charge 2. 0 is active when it is connected to a certified charger?
I bought both in AC and DC certified charger. both were very highly rated on Amazon. The AC charger for example is made by Anker.
The app Ampere reports a low milliamp rating of around 250mA when I am using either of these two chargers.
When I connect two different chargers that are not quick charge 2.0 certified then Ampere reports a charging current of upwards of 1800mA.
I suppose the issue could be Ampere, that it doesn't know how to measure when the quick charge technology is present. Does anyone have any direct experience with this to know what the issue is?

When I use my 2.0 Charger I can go from dead to full in about an hour. So yeah i'd say it's active!

Even with a QC 2 charger, you won't see high charge rates unless the battery is low. All chargers will slow down as the battery charges. That's just how they work. I have also seen cables make a difference. I have some right and left angle cables from Star tech that will only charge at one amp. Samsung and HTC OEM cables will allow charge rates above one amp. Finally, most programs display the charge rate after subtracting the power that the phone is actively using.
Ex, your charger is 1.5 amp, the phone is awake and playing a game taking 800 milliamps, at full power you phone can only charge at 700 milliamps as that is the charger's maximum output.

Deleted, issue sorted.

The charger supplied with phone is not quick charge compatible.
(At least in UK )
HTC do sell a quick charge 2.0 compatible charger as an accessory.
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