This is likely far less than what we originally paid. So are cell phone companies trying to scam us into paying more, The answer is absolutely not, and many people do not grasp this concept. When you get an "upgrade" you are signing a two year contract and when that happens your phone is often "subsidized" in cost by the wireless carrier or retailer. Phones are made by manufacturers such as Motorola Apple, HTC, etc. They sell phones to retail stores which in turn sell them for LESS than what they paid. How can they do this,
When you sign that contract the service provider is willing to take a hit on the phone, because they know they will eventually usually several months down the road turn a profit. The reason you have to wait for eligibility to upgrade is, because that carrier has already taken a hit on your first phone purchase and needs to be able to recoup their costs first, and of course profit.
This is after all a billion dollar business with extremely high overhead costs. I could go in to a lot more detail, but that is the basic gist of things as far as pricing goes. Not a lot of other service providers do this in other industries, an example being if your cable company sold HDTV's at a super low cost with activation of service or maybe premium channels.
So why is the iPhone upgrade price so much less, 150 dollars off retail costs (manufacturer price). 400 dollars. How come, The iPhone is a top seller and iPhone users take advantage of far more features, accessories, and tend to keep these services longer than other phone users affording AT&T to offer an amazingly low price for such a device. So take advantage of the deal and pick one up!
And I had another one at my door shortly after. Keep in mind that at this point I still didn't have to send them anything. Then there was the power adapter for my Lacie external HD. It failed out-of-warranty and they just send me another one, no questions asked. Hi Ken, awesome experiment.
I have been interested for a while to understand how a USB charger of a given rating (e.g. 2.1 A) charges different devices. The motivator is that while Apple says you can use an iPad charger for iPad/iPhone/iPod, which makes sense, using my iPad charger on my iPod for 2 weeks in Mexico completely destroyed its battery's ability to hold charge.
So I opened up an Apple 30-pin cable, cut just the red wire and ran it through an ammeter. The iPad that claimed to be at 65% was only drawing 100 mA. Apple designs these new concepts. IMO just about all of these USB "chargers" are constant voltage power supplies. Basically a mini version of the average desktop PC power supply.
Therefore the choice of "charger" shouldn't normally influence charging, assuming voltage remains well-regulated in the face of whatever current is demanded. I can only speculate as to the cause of your battery misfortune. I do know that lithium-based cells are not generally fond of heat (plus charging does warm them up), and keeping them very full further speeds up aging. Such a rapid loss of capacity would point to an already damaged cell, possibly a production issue. I can see the transformer is not big.
DC voltage can be seen as the high frequency AC voltage, Is there any design details for how to design the transformer, I take my charger to Europe (220v) from America (110v) the output on the charger drops down to somewhere close to 300mAMP from 1Amp. I could never guess why, i would appreciate it if someone could explain why this happens. I'd like to see a tear down of the new 12W charger to see what they've changed. I'm wanting to build a charging station with at least a dozen ports.
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