Slow charge? Use a proper charging cable!

[LordDraco]

Using standard cable, LG G2 is the fastest charging device I ever owned.

Sent from my LG-D802 using AC Forums mobile app

 

[Kdroid]

The 'slow charging' never bothered me but it now appears gone since applying the OTA update on the Verizon version. I've been using a SGS3 charger with a generic cable.

 

[Jgren]

The 'slow charging' never bothered me but it now appears gone since applying the OTA update on the Verizon version. I've been using a SGS3 charger with a generic cable.

Same here,No slow charging after update

Posted via Android Central App

 

[mikecrogan]

if it is not the cable, why won't it charge in my car cigarette lighter?

 

[sbudaj]

Same here,No slow charging after update
Posted via Android Central App

It isn't saying it anymore, but is it still "slow charging"?

 

[heypr0]

I ordered my D802 on Amazon.uk and received an English power outlet, but in Belgium we have different ones
(http://fotodatabank.seniorennet.be/LargeThumbs/398/25569.jpg )

I am now using the original cable + Iphone charger but it's going horribly slow.

Please advice me which one i should buy because its driving me nuts.. takes almost 7 hours to charge this phone. Would love to buy a better one online.....
http://www.redcoon.be/B489720-Samsung-Oplader-EP-TA10-white_Accus-Opladers Would this one be any good?

 

[Joe Btfsplk]

I am an electrical engineer(MSEE) and have recently spent a bunch of time testing chargers and cables. I stumbled across this thread when doing an unrelated search and find so much confusion and misinformation that I'd like to help a bit.

First:

This also can happen if you're using the supplied "oem" charger but have it plugged into an lower amp outlet, ie hotel nightstands and lamps with outlets, or cheap power strips. If your plugging in to an outlet like this, check from a regular wall outlet

. This is complete nonsense. Ignore it.

Now, chargers: To charge at anywhere close to 2 amps (most tablets) you need a charger that will put out 2 amps. If the charger is not marked to put out 2 amps, it will not. If it is marked for 2 amps there is a possibility, but not a certainty, that it will actually do that. This is why OEM chargers are preferable. An OEM charger will probably deliver what its nameplate says. Go here for more: Ken Shirriff's blog: A dozen USB chargers in the lab: Apple is very good, but not quite the best

Cables: WIth a good charger and with a device that wants ~2 amps, your random USB cable might result in a 0.4 amp charge or it might result in 1.9 amps. There is no way to tell from looking at the cable. The issue is internal resistance, which is affected by wire size and by the way the wires are hooked to the connectors. IMO you have two choices here: One is to use only the OEM charging cable. This increases your odds but does not guarantee a fast charge. I have seen OEM cables that are not too good. The other is to go to monoprice.com and buy the cables that are marked 28/24AWG. (USB 2.0 to Micro B Cables - Monoprice.com) These are wire gauge numbers and the "24" means that the charging wires are larger diameter. I have tested 8 of these cables in 1.5 and 3 foot lengths and all delivered full charge. They are dirt cheap.

Your final alternative is to buy a USB ammeter and test all of your cables and chargers. I have the Centech (Amazon.com: USB Power Meter: Computers & Accessories) which was about $35 and does a good job.

HTH

 

[cybertron71]

I used to get a slow charge message in spite of using my LG G2's original charger and cable. Looked through the thread here and traced the problem back to my power strip. When I plug the charger directly into the wall, voila, no more slow charge message!

 

[BecomingDeath13]

Lol lately my g2 has been charging slowly (and dying quickly) but there's no 'slow charge' indicator. I'm thinking it may be the battery itself, so I'm probably gonna have to buy a kit to replace the battery myself. *shrug.

I may have gotten a defective battery that just took a while to reveal itself. I'm usually pretty good about not over charging and plugging it in at around 10%.

 

[OzRob]

I used to get a slow charge message in spite of using my LG G2's original charger and cable. Looked through the thread here and traced the problem back to my power strip. When I plug the charger directly into the wall, voila, no more slow charge message!

Can you please explain how using a power strip can affect the output from a phone charger? Unless the power strip is dangerously defective and potentially hazardous to use, I can't think of a mechanism by which this could happen.

 

[Destiny Camacho]

My charger had the same problem, just yesterday it didn't want to charge my phone so I went to by another charger, now it's charging slow. Do I have to by the same charger that was given when I bought the phone?

 

[macbook5]

Different question: The supplied LG charging block is 1.8A capable. Is using a charging block that is capable of higher amps of 2.0A be detrimental to the G2? Or will the phone only draw up to it's 1.8A maximum?

 

[acejavelin]

Different question: The supplied LG charging block is 1.8A capable. Is using a charging block that is capable of higher amps of 2.0A be detrimental to the G2? Or will the phone only draw up to it's 1.8A maximum?

Current is drawn, not pushed... you could use a 100 amp charging source and it won't matter.

Sent from my Samsung Galaxy Note Pro 12.2 using Tapatalk

 

[simon_lefisch]

Current is drawn, not pushed... you could use a 100 amp charging source and it won't matter.

Sent from my Samsung Galaxy Note Pro 12.2 using Tapatalk

Deleted. Misread your post. 100 amp charger is fine. 100mA would damage the battery.

 

[acejavelin]

Using a 100 amp charger would damage the battery. You want a charger with the same or higher amperage. Voltage wouldn't matter as much.

The Voltage matters very much, there is a very specific range for USB voltage. Current is drawn by the device based on the amount of resistance it applies to the circuit, current is not "pushed", it is drawn by the device, if it is only going to draw 1.8 amps maximum it doesn't matter if the power source is capable of 2a or 10,000a, the current drawn will be the voltage divided by resistance, the power source controls the voltage, the device controls the resistance, the current drawn is the product of those two values.

EDIT: Oops, simple misunderstanding, but the facts are correct and many people don't understand that, so I am not deleting the post.

Sent from my Nexus 4 powered by Beanstalk ROM and Hellscore kernel

 

[OzRob]

Deleted. Misread your post. 100 amp charger is fine. 100mA would damage the battery.

A 100mA charger WILL NOT damage the battery, it will just take a lot longer to charge. Or it may not charge at all. But it won't damage the battery.

 

[thubten2001]

Can anyone give the precise voltage and current required to kickin the fast charge. I am trying to figure out why this httpcolonfrontslashfrontslashlygte-info.dk/review/Review%20USB%20battery%20box%204x18650%20UKdothtml won't charge my phone. It is supposed to put out 5v and 2amps. Based on the charts I am wondering if the phone requires higher voltage and current for a minute or two before the fast charge kicks in and the battery bank won't supply the constant voltage and current required. I am using the OEM cable so I have eliminated that variable.

 

[richardodn]

I use a charging only cable (search Amazon for "red band cable") and chargers that used to only slow charge with any cable now do a fast charge. It has to do with Apple's non-standard USB signalling methods and vendors adopting those specs instead of the USB standards. Specifically I use a Red Band cable and a Griffin Dual USB car charger.

 

[thubten2001]

Is it apple voltage (if so what is the required voltage to kick in fast charging) or is it having the data pin shorted?

 

[OzRob]

Is it apple voltage (if so what is the required voltage to kick in fast charging) or is it having the data pin shorted?

The latter. For the phone to enter Fast Charge mode it has to detect that the port isn't a USB data port. Most chargers short the data pins internally so you can use any USB cable. Perhaps the charger you're trying to use doesn't do this, in which case you will need a 'charge only' USB cable.