Portable Charger for Samsung Galaxy S3

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I'm looking for a portable phone charger for my Samsung Galaxy S3. I want one that is fast and gives lots of charges. I did buy one at Walmart.It's a Pocketjuice and its 20,000 mAh and another number is 4.2. ( I don't know what the letters and numbers mean)
I like it as its fast but its so big. Can someone explain to me what the numbers mean and what I should look for ? ( a friend has this charger and she says her phone gets hot !)

Thanks for your help!
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jackies

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Posted 2 years ago

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JeremyESQ

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The 20,000mAh refers to the capacity of the charger.  The stock capacity of your S3 battery is 2200mAh so this should give approximately 8 charges given the some energy is lost during the process of charging your phone.  I believe the 4.2 could refer to the output of the charger in amperage.
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jackies

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I think you are right that the 4.2 is amperage.A guy had a cell shop said if I have a 4. 2 it will burn up my phone !I guess it's too big which is ok cause it awkward to carry.
The next one I saw is 10000 which is the same price. I think I'll buy a 6000 as its lighter..I'm just worried it will be slower charging as I dont think it's a 4. 2 amp.
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BobTheElectrician

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What you have bought is more of a portable power pack rather than a charger. It's meant to be used if your battery runs low, as if you were carrying a spare battery. The Samsung S3 battery is rated at 2100-2200 mAh which means if you attached an external battery of 4200mAh, you should have enough juice to fully recharge your internal Samsung battery and have about the same equivalent left over in the charger pack.

The reason I doubled your 2100 is that if you connect 2 batteries together, they will tend to even out the charge: the strong one becomes weaker while the weaker one gains strength over time. So a spare 4200 will get your original to 2100 as it's meant to be. Hooking up just another 2100 will eventually get you a half charge on both. During the intial hookup, the battery with the lower charge can get warm.

Think of it as mixing hot and cold water, with the hot water being the "charged" component. Unless you actually plug the kettle into the wall and add more energy, pouring from one glass to another will just get you more and more luke-warm water.
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David, Mobile Master

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I use one of these for portable charging. They are a bit difficult to bring into the house, but easy to transport.  I have yet to find it with insufficient reserve capacity to recharge my phone.

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Goran, Mobile Master

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Lol at will burn up your phone. Don't worry about that.
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jackies

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So my friend who has the 20000mAh shouldn't be worried? She said her phone gets really warm..almost hot when the charger is plugged in.She slso uses the phone as its charging !?!
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BobTheElectrician

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You can use the phone while it's plugged into the auxiliary pack, but some mfgrs warn against using the aux pack while it's plugged into the wall. The aux pack typically has circuitry that controls charging and discharging, but not both simultaneously. They sometimes have the cables configured so that you can only do one at a time.
(Edited)
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jackies

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Ok...thanks Bob.
Another unrelated question.Does the Koodo Self Serve App shut down during the night at certain times. I have been trying for a few minutes and when I sign in..it says there is a network problem !
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Goran, Mobile Master

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That is normal for most phones when it is charging and being used. The phone will only take whatever current it is able to take.

Now, if it's just too bulky, then sure get something smaller.
(Edited)
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jackies

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Does it hurt the phone/battery to be using it and charging it at the same time?

I did get a different charger.A smaller one 6600 mAh and I think it is a 3.2 amp.

Thanks for your help.
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David, Mobile Master

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No. It is just a little more awkward using it with the charging wire connected.
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jackies

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Ok...thanks David !
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Paul Deschamps, Mobile Master

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If you have a Factory direct store near you they have great deals on them all the time, I just bought an 8,000 mAh one that is nearly the exact same size of an iPhone Plus model so it fits great in a pocket or in your purse and should charge your S3 a couple times before needing a charge and I paid $20 for it. Here's the one I'm talking about and they have many others as well for a great price http://m.factorydirect.ca/Product.asp...==
(Edited)

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