Car charger for samsung tab 2.7?

[jaideeguy]

I just discovered why my tab 2.7 won't charge on my pc USB outlet. It requires 2 amps @ 5volts, so I assume that most car chargers are set at 1 amp rate of charge. I have found some on amazon.com and Samsung even has an official model for only $13......maybe more here.

Questions are, are they available here?? where?? how much and would a 2 amp quick charge on a cell phone do any damage to the battery??

Thanks in advance and BTW, I'm in Chiang Mai.

[akampa]

your head line' car charger for the Tab 'DONT use the car charger on the your pc any way computers do`nt have car charger sockets Use the supplied USB cable which you use when charging via the mains just unplug the USB part from the mains adapter and plug that end into your USB connector on your PC.

just checked my tab 2.7 with the USB connected to my pc no problem ,check your USB pc connection maybe a problem there!

[Pib]

If the tablet won't charge (or charges very slowly) from a USB port which can only put out 500ma to charge your approx. 4000ma battery in your Tab 2 7" tablet, why aren't you using a wall charger?

I'm sure a 5V wall charger, probably a 1A or 2A version, came with the Tab 2. And a 1A charger (wall charger or car adapter charger) probably won't charge your tablet any faster than a 2A charger because it's your tablet that controls the charge rate--not the charger. If it only needs say 900ma to do a max charge rate that is all it will draw from the charger....it wont draw 1A...it won't draw 2A...it will only draw what it asks for from the charger. The charge rate(s) the tablet will use is encoded in its firmware. And there are different charge rates in the firmware...usually when the battery reach around 80 to 90% charge, the charge rate will fall off for that final 10% charge because that the best way to charge lithium batteries to get max charge and ensure long live.

The only real benefit of having 2A charger is it should last longer than a 1A charger. Ex: say the max current you Tab 2 draws is 900ma...OK it will be running that 1A charger at 90% of it's capacity...but you tablet is still receiving ever ounce of charge it asked for....the 1A charger will probably get pretty warm since it working at 90% of capacity. But that same 900ma will only be running that 2A charger at 45% of its capacity...it shouldn't get nearly as warm as the 1A charge.

Now, if by chance say your Tab 2 does request say 1.5 amps during it charge cycle, well, it will only be able to get 1A from the 1A charge and therefore the tab will charge a 1A vs 1.5A...it will just take longer to reach full charge. But a 2A charger would be able to meet that requested 1.5A charge rate.

Many tablets with larger batteries will not charge while running and hooked to a USB port simply because the USB port can only put out 500ma and the tablet will probably be using more than 500ma while it running...most likely in the 600ma to 1000ma range. Kinda hard to fillup the car gas tank if you are only pumping in 1 liter per hour but the engine is burning 2 liters per hour...but turn the engine off and you are now beginning to fill the tank at a 1 liter per hour fill rate.

The fastest way to charge any tablet/smartphone is with it turn off so it's not using up battery charge as you are trying to pump more battery charge into it. But if the intent on using the tablet while charging it just keep in mind depending on the size of the tablet's battery and its firmware encode charge rates, it will probably take a lot longer to charge. Yea, yea, smartphones charge pretty fast when still turned on but they are using a lot less power while turned on and have smaller batteries than tablets....a typical mid-priced smartphone only has around a 1500ma battery.

Heck, I have a Onda 9.7" tablet which uses a 6000ma battery....if I try to charge from a USB port which can only put out 500ma while it's running and usually burning around 1000ma, all I've done is slowed down the "discharge" rate to 500ma. But turn off the tablet and it "charges" at 500ma from the USB port...but if charging from a USB port it can take up to 14-16 hours to fully charge its 6000ma. Now turn it off and use it 2A wall charger and it reaches a completely dead battery/0% charge to 100%/fully charged in around 5 hours. The Onda manual recommends only charging the tablet while it's turned off...probably to ensure fast charging and to prevent people thinking it faulty because it taking so long to charge.

[akampa]

check this out this might help.

http://www.youtube.com/watch?v=d8_cyM2oHEw

If you have the option between a laptop and a wall charger, always choose the wall charger. Charging your device via your laptop will be significantly slower than if you charged it from a proper AC power outlet.

Your computer's USB port does not deliver the same amount of power as the wall charger plugged directly into the wall can.

One reason for this is that your computer's USB port does not deliver a constant amount of power. The amount of power it generates out to your device all depends on several variables, such as the software and hardware on the computer, the amount of USB ports being used, and using your computer while simultaneously charging the device.

The other reason that you should charge your device via the wall charger is because these adapters are specifically designed to charge your device at its maximum level.

The wall plugs all charge faster than the USB specification of 500mA at 5V (which are the specs for my MacBook; it differs in all computers

[jaideeguy]

I may have found a better solution to 'on the go' charging that will give much more flexibility.............

http://www.amazon.com/gp/product/B00BB5GR0A/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A2KV19AYUKS3X0

it would allow me to carry my own back up battery bank anywhere I go.

I placed it in my amazon shopping basket and will order it this week unless someone can tell me of a local source or tell me any reason why this would not work.

[Asia2000]

Is this what you look for ?

http://www.invadeit.co.th/product/smartphone-tablet-accessories/targus/car-charger-for-laptop-usb-tablet-apd046ap-p010441/

'The Targus Car Charger for Laptop & USB Tablet is a 90 watt adapter that allows you to quickly charge a laptop and USB tablet or smartphone at the same time from your car’s electrical socket. Sized for travel, this charger is 25% smaller than most conventional car power adapters and comes with a 2.1A USB fast charging port that connects with your USB devices charging cable providing the same charging speed as your original charger.'

[AnotherOneAmerican]

Samsung have carefully designed their Tablets to only charge quickly from a Samsung charger.

If you use any other charger or a USB socket it will charge but at 1/4 speed.

It don't matter what rating your other charger has.

Red X means slow charge at 500ma.

Lightning means fast charge at 2A

[AnotherOneAmerican]

I may have found a better solution to 'on the go' charging that will give much more flexibility.............

http://www.amazon.com/gp/product/B00BB5GR0A/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A2KV19AYUKS3X0

it would allow me to carry my own back up battery bank anywhere I go.

I placed it in my amazon shopping basket and will order it this week unless someone can tell me of a local source or tell me any reason why this would not work.

This will also work, but at 1/4 speed of the Samsung charger.

Red X means slow charge at 500ma.

Lightning means fast charge at 2A

You need a special cable to 'fast charge' from anything but a Samsung charger.

Here is one

http://www.ebay.com/itm/160709394617

[Pib]

Samsung have carefully designed their Tablets to only charge quickly from a Samsung charger.

If you use any other charger or a USB socket it will charge but at 1/4 speed.

It don't matter what rating your other charger has.

Incorrect. While the charging cable between the Samsung tablet and USB charge may be unique (really just the end that plugs into the tablet may be unique) the charger you plug into the wall is not. Like on my Samsung Note 10.1 tablet, while the cable between the tablet and charger are unique (well, really just the wide connector that plugs into the tablet...the 4 pin USB end is just a standard 4 pin USB connector), you can plug the USB end of the cable into a standard USB charger. I know, I have tried by using other 2A wall chargers--like a spare no-name 2A charger I bought in case any of my USB chargers for my Samsung smartphones or Onda (a Chinese brand) tablet fails....I even tried the Onda 2A charger on my Samsung tablet and smartphones....charges them just fine at full speed.. By full speed I mean if the tablet firmware is requesting 1A (or more) depending on how depleted the battery is , then 1A is drawn from the charger assuming it's at least a 1A charger.

I figure it's better to use 2A chargers, like came with both my Samsung and Onda tablets and even came with my Samsung S4 smartphone since the S4 has a larger battery than the average smartphone. A 2A charger will normally last longer than a 1A (or smaller) charger since the 2A charger will usually only be pumping out an amperage significantly less than its upper capability of 2A.. Or said another way it don't have to work and sweat as hard as the 1A charger to provide whatever amperage the tablet firmware requests during the charge cycle...and the amount of amperage requested will vary during the complete charge cycle like once the battery gets close to full charge like around 90% the charge will usually tapper off to a lower valve for that final 10%...it allows the lithium battery to reach a better saturation charge and last long versus trying to charge it as full blast until it reaches 100%.

And I would not recommend using small amperage charger (like 500 to 750ma) that come with some smaller phones to charge your tablet because tablets are going to have larger batteries, the tablet firmware is most likely going to request more than 750ma...maybe even up to 1500ma during part of its charging cycle which is going to make that smaller charger run at full capacity which can greatly shorten its life...if it's a really cheap charger it could actually fail very rapidly (i.e., smoke itself).

You might wonder what tablets don't smoke computer USB ports which only put out 500ma...well, that because the computer USB circuitry also has built-in circuitry to cut off the 500ma output when overloaded or limit the current draw to a max 500ma. A typical tablet charging on only 500ma can take a lot longer than being charged from a wall charger...and trying to charge the tablet while it still running can be a losing battery since the table may be burning around 500ma while you are pumping in 500ma...you end up with little to no charging action. But a lot depends on the battery size of your device, the charging rate it needs, etc.

Summary: sometimes it's just the tablet connector/cable that is unique but rarely is the basic USB wall charger unique. Now this apparently does not apply to some "Apple" tablets/phones since Apple seems to be big into keeping it cables and chargers unique whenever possible...but fortunately Apple is slowly changing.

[AnotherOneAmerican]

Incorrect. While the charging cable between the Samsung tablet and USB charge may be unique (really just the end that plugs into the tablet may be unique) the charger you plug into the wall is not.

You are 100% wrong.

Samsung charger modified.

Samsung cable bog standard.

If the Samsung cable were modified (as you suggest), then data wouldn't flow down it.

[Pib]

Incorrect. While the charging cable between the Samsung tablet and USB charge may be unique (really just the end that plugs into the tablet may be unique) the charger you plug into the wall is not.

You are 100% wrong.

Samsung charger modified.

Samsung cable bog standard.

If the Samsung cable were modified (as you suggest), then data wouldn't flow down it.

I never suggested the Samsung cable was modified...it is what it is. It's just you can plug the USB end of that Samsung cable into any standard USB wall charger to charge your device. A person is not worried about data flow when using a wall charger...they are just charging. And even when you plug the cable into a computer USB port "just to get a charge" you are no worried about any data flow.

[Pib]

check this out this might help.

http://www.youtube.com/watch?v=d8_cyM2oHEw

If you have the option between a laptop and a wall charger, always choose the wall charger. Charging your device via your laptop will be significantly slower than if you charged it from a proper AC power outlet.

Your computer's USB port does not deliver the same amount of power as the wall charger plugged directly into the wall can.

One reason for this is that your computer's USB port does not deliver a constant amount of power. The amount of power it generates out to your device all depends on several variables, such as the software and hardware on the computer, the amount of USB ports being used, and using your computer while simultaneously charging the device.

The other reason that you should charge your device via the wall charger is because these adapters are specifically designed to charge your device at its maximum level.

The wall plugs all charge faster than the USB specification of 500mA at 5V (which are the specs for my MacBook; it differs in all computers

Preaching to the choir I'm sure but for others listening, in that YouTube video the reason the tablet started to show it was now charging (is because when the guy "just barely" plugged the USB cable into the computer USB port, pins 1 and 4 (the two outside pins which are the 5V voltage positive and negative pins) on the USB cable are just a few millimeters "longer" than pins 2 and 3 (the two inside pins which are the two data flow pins), which means only the 5V power pins made a connection; there was no data connection made. And actually where I said pins, they are not round pins but flat connection pads. Of course the tablet may only be charging at a few milliamps...maybe just a little above what it's currently burning while the tablet is turned on if the computer port was a USB 2.0 port (500ma max output) but significantly more if it was a USB 3.0 port (900ma max output).. Probably the great majority of computers are still using USB 2.0 ports.

Anyway take a look at any standard USB "cable" end, like plugs into your computer or wall charger or auto charger adapter. You'll probably have to use a magnifying glass under good light to clearly see the pins/pads, but you will see the two outside pads are slightly longer than the two inside pads. Maybe you can see what I mean by looking closely at below image. This way when any USB powered device is plugged in, the 5V power is first connected by a few milliseconds before any data connection due to the few millimeter longer pad length of the power pads.

So, in the video where only the 5V pads made connection there was no data connection made for the tablet to possibly tell the computer USB port to limit the the current output to "less than" 500ma on a USB 2.0 port and "less than" 900ma on a USB 3.0 port. Now when I say data connection/flow I don't mean data flow like transferring files/videos/music/etc, I mean just the basic USB control data protocol just like the basic protocol connection between a laptop and Wifi router whether the Wifi router has a internet connection to the world or not. And with most standard USB wall chargers the two inside pins may be shorted, opened, or have some resistance across them, but are basically unneeded/not used.

Heck, when I was still using a midprice Samsung smartphone that came with a wall charger that had a miniUSB connector on one end and the other end of the cable integrated directly into (not removable) the charger, well, one day that charger died. I bought another one which was not lableled Samsung but Nokia and it worked just fine. But before throwing away the old Samsung wall charger I cut off the cable where it went into the defective wall charger. I wanted to save the cable for maybe a future project...anyway that cable only consisted of two wires inside which would have been for the 5V power; that cable did not have two more wires for the data connections since a data connection was not really needed for charging.

[jaideeguy]

So, it seems that most of the replies disregarded or missed my last post where I realized that a battery bank may be more practical for my needs..... I repeat:

"I may have found a better solution to 'on the go' charging that will give much more flexibility.............

http://www.amazon.co...=A2KV19AYUKS3X0

it would allow me to carry my own back up battery bank anywhere I go.

I placed it in my amazon shopping basket and will order it this week unless someone can tell me of a local source or tell me any reason why this would not work."

it claims to be compatible with samsung galaxy series as well as lots of other devices and has a dual output.....1 amp and 2 amp would it do the trick for me??

[Pib]

Sure it will work. It's nothing more than portable USB ports powered by a rechargeable battery. It puts out 5V so it will work.

Sent from my tablet