I found an interesting Video on Picking the "Best Power Supply" for the Raspberry Pi. The Raspberry Pi, is an inexpensive ($25 to $35) Computer for Learning and Experimenting with Programming. All on a Credit Card Sized Circuit Board. I'm getting ready to Order a Raspberry Pi for my self. But, they don't come with a Power Supply. I originally thought that I would be able to use one of the several Standard Barrel Connector type of 5 volt or Adjustable Power Supplies that I already have. But, the Raspberry Pi, uses a Micro USB-B Connector. Not the Usual Barrel Type of connector that has been used on Electronics for the Last 30 Plus Years. The Raspberry-Pi-Schematics-R1.0.pdf. Just says, "USB Power Input 5V 700mA min". No mention of the Maximum Voltage or Amps, that it can handle. And the Maximum input voltage and Amperage Rating, is something we need to know. If we are going to have to source our own Power Supplies. I've found a bunch of 5V 1A Power Supplies that are claimed to work with the Raspberry Pi. But, during my Searches for the Best Power Supply, at the Best Price. I noticed allot of People Commenting on the Problems they were having with 5 volt, 1 amp Power Supplies. The Voltages drops, when they Plug in a few USB Devices and the Pi Begins to Malfunction. Especially if you use a USB Hub. I have found nothing official from the Raspberry Pi Foundation. But, it looks like there is still, No Definite Answer for the Raspberry Pi on their Web Site...

Update: I finally found some good info on Some Power Supplies that are known to Work. And some that are known Not to Work with the Pi...

Working power Adapters

There is now a 5.25V 1500mA power supply manufactured specially for the Raspberry Pi to account for voltage drop due to the high current draw of the Raspberry Pi when compared to typical (phone charging etc.) duties.
Available in UK, EU, USA and AU varieties from Pi Hut and Pi Supply

Adafruit
- 5.25 V 1 A Model 501 (Newark 44W4932) USB 110-240 VAC power supply [4.99-5.01 V @ T1/T2 with 100 mA BT and/or mini wireless-n on RPi USB ports]
AlcaPower
- 5 V 2.5 A Model AP5A - Charger/switching with 7 connectors(also Microusb)
Ansmann
- Dual USB charger slim, Model-Nr. 1201-0001
Apple
Note that apple designs its charger products to work optimally as chargers. In practice this means that apple chargers drop their output voltages somewhat with output current, so that the charging circuits do not need to dissipate more heat than is strictly necessary. Because of this, and although many people have reported apple products to power their basic PI setup reliably, its still not an optimal choice for a PI system that uses power hungry USB devices. Also, because of the popularity and high price of these chargers there are many very sub standard, but almost impossible to recognize as fake copies on the market, and some of these fakes are about the worst things you can try to power your PI with! Not only do they not work, they may actually be dangerous to use!
- 5 V 2.1 A USB charger for iPad2, model A1357
- 5 V 1.0 A USB Charger for iPod
- 5 V 1.0 A USB Charger for iPhone 4
Amazon
- 5 V 0.85 A USB charger for Kindle
- 5 V 2 A Mains to USB A adaptor, Branded "CostMad"
Asus
- 5 V 2.0 A USB charger for Google Nexus 7
Bandridge
- 5 V 1.0 A Mobile Phone Charger (Model: BPC3102EC)
Belkin
- 5 V 2.6 A 4 port Ultra-Slim Desktop hub (Model F4U040) (Raspberry Pi running from USB hub port)
- 5 V 2.5 A 4 port USB Hub (Model F5U404) (Raspberry Pi running from USB hub port)
- 5 V 3.5 A 7 port USB 2.0 Mobile Powered Hub (Model F4U018) (Raspberry Pi running from USB hub port)
- 5 V 3.5 A 7 port USB Hub (Model F5U706) (Raspberry Pi running from USB hub port)
- Mini Surge Protector Dual USB Charger (Model BZ103050-TVL)
- Universal USB Wall Charger (5 V 1 A) (Model F8Z222uk)
Blackberry
- Charger for Pearl Flip 8220, Bold 9600 (B)
- Charger for Tour 9630
- 5 V 0.7 A Model PSM04R-0500CHW1(M), RIM Part Number HDW-17957-003 (B)
- 5 V 750 mA Model RIM-C-0004aDUUUC-001, RIM Part Number HWD-24481-001 (comes with Blackberry 9300)
- 5 V 750 mA Model RIM-C-0004ADUUS-001 035D, Single port plug. (Tested with USB B to Micro USB cable from Logitech H760 Headset)
- 5 V 2 A Model PSAC10R-050QT, RIM Part Number HDW-34725-001
- 5 V 550 mA curve 8520 charger works with raspberry pi Model B Board v. BS1233. It does not work with Raspbmc image.Symtoms are frequent key board and external hdd disconnects.
Deal Extreme
- S-10-5 5 V 2 A Regulated Switching Power Supply (110~220 V) (DIY: requires additional micro-USB connector and wiring)
Dell
- USB Hub integrated in Dell monitors (B)
DLO
- 5 V 1.0 A PowerBug (Model: SP05001000-A) Powers Pi, Wifi dongle and Webcam
The FX Factory
- 5 V 1 A (1.2 A max) AC Travel Charger Model KJ-USB Mains. Typically provides 4.9 V at 1 A ^[1]
Garmin
- 5 V 1 A charger (Model: PSA105R-050Q) supplied with Garmin Edge 800 GPS. Requires a USB-A to MicroUSB-B cable. Belkin 6 ft cable (F3U151B06) works.
Gembird
- 5 V 2 A Universal USB Charger (Model: MP3A-UC-AC5). Test: 1080p TV (1xHDMI), USB Wi-fi adapter (1xUSB), wireless keyboard and mouse (1xUSB). Results: ~5.3V, works without any problems (own usb cable required).
Globe Electric
- 2-Outlet Tap with Surge Protection and 2 USB Chargers (46082). Rated at 1000 mA. 120 V systems only.
Griffin
- Power Block Model P2417. 5 V 2.1 A
- Power Block Model P1190R2 Two USB 5 V Outputs, 1 A each
Hama
- 1000 mA Travel Charger for Micro USB universal (barcode nr: 4 007249 935854)
Hartig + Heiling GmbH & Co. KG
- H+H SN 6 USB
HP
- 5.3 V 2 A Charger for HP Touchpad (B)
HTC
- 5 V 1 A TCP-300 USB phone charger (B)
- 5 V 1 A TC B250 USB charger (HTC R/N: 79H00096-00M)
- 5 V 1 A TC E250 USB charger (HTC R/N: 79H00098-02M)
i-box (Philex Electronic Ltd)
- 5 V 1 A USB charger, 1 USB socket, no USB lead supplied, Model: 76971HS/02 (available from ASDA and others in the UK) (B).
IDAPT
- i4 multi device charger - 3 interchangeable device tips + USB A socket (see it in use)
Innergie
- 15 W Dual USB Adapter. Model: mMini AC15. Output: 5 V, 3 A (max per port), 15 W max. Specification sheet
ICIDU
- PI-707730 charger 5V 2.1A, sometimes drops current to ~1.3A during heavy use, but still enough to power the Pi.
Kodak
- 5 V 1 A TESA5G1-0501200
- 5 V 1.0 A K20-AM
König
- 5 V 1 A PSUP-GSM01
Kuanten
- Model SSA051F050100USU, 1A output
LG
- 4.8 V 1 A Travel Adapter
- 5.1 V 0.7 A Travel Adapter (Model: STA-U34WVI)
- 5.1 V 0.7 A Travel Adapter (Model: STA-U12ER)
Logic
- 4 port USB Hub (Model LP4HUB10). (Raspberry Pi running from USB Hub port, red power line (+5 V) inside hub cut) (B)
LogiLink
- 5 V 2.1 A Switching power supply, model PA0040 (B)
Logitech
- 5 V 1 A SDC115-USB Remote Control Charger and cable
Maplin Electronics
- 5 V 1 A dual USB power supply, model number H25B-MT-K2
- Micro USB Power Supply N19HX
Medion
- 5 V 1 A USB power supply for OYO ebook reader
Microsoft
- - Zune Zune AC Adapter v2
ModMyPi
- 5.25V 2A HQ Raspberry Pi USB Power Supply (Detachable USB) [5.01 - 5.07V @ T1/T2 with Wifi dongle and Wireless Mouse/Keyboard on RPi USB ports]
Motorola
- 5 V 0.85 A SPN5504 Charger with Cable
Noname
- 5 V 2.1 A KMS-AC09 4 port USB charger (B) [7]
- 5.2 V 1 A MW-3NU10GT - no cable, but this one works well (1m): [8]
- 5 V 1 A Model H-IP008 Serial No. H10T80L068
Novatel Wireless
- 5 V 1.05 A Charger, model number SSW-1811, packaged with Verizon Wireless MiFi device
Orange
- 5 V 0.7 A Charger for Orange San Francisco
Palm
- 5 V 1 A Charger for Palm Pixi+ (B)
Pantech
- 5.0 V 1 A CNR USB with LG DLC100 micro USB cable
Petzl
- 5.0 V 1 A Charger that came with the Tikka core2 XP
Phihong
- Switching Power Supply. Model: PSAC09R-050. Output: 5 V, 1.8 A, microUSB. Digi-key Link
Pi Supply
- 5.25V 1.5A Raspberry Pi USB Power Supply Specially designed for the Pi. Comes in 4 varieties for worldwide compatibility - UK, European (EU), American (USA) and Australian (AUS).
PortaPow
- PortaPow UK Mains Wall Power Supply
PowerGen
- PowerGen Dual Port USB 2.1A 10W AC Travel Wall Charger. Amazon Link
Rayovac
- Universal USB Charger Model: PS69 100-240 VAC to 5 V 1 A (small cube w/folding plug) works w/wireless keyboard/mouse and mini-Wifi connected
RS Components'
- HNP06UK (RS 7263069) Switching Adapter 5.0 V 1200 mA
Samsung
- 5 V 0.7 A Charger for Galaxy S model ETA0U10EBE
- 5 V 0.7 A Charger for Galaxy SII
- 5 V 1 A Charger for Galaxy SIII
- 5 V 1 A Charger for Galaxy Nexus
- 5 V 0.7 A Charger for Galaxy S Vibrant (SGH-T959)
- 5 V 0.7 A Travel Adapter model ATADU10EBE
- 5 V 1 A? Samsung C Series TV USB-port for external HDDs. Running stable with openelec
- 5 V ?A (Unknown) Samsung Service Port (USB) on LN32A330J1DXZA 720p 32 inch HDTV
- 5 V Unknown Ampere Samsung UA22D5000 & UA32D5000 TV USB Port. Test with Raspbian Wheezy, Raspbmc, and RPITC
Shun Shing
- 100-240 VAC to 5 VDC 1 A USB power supply, model SP5Q-AU Jaycar
Sony Ericsson
- 5 V 0.7 A Charger CST-80
- 5 V 0.85 A Greenheart™ Charger EP800. Typically provides 4.8 V at 0.85 A ^[2].
StarTech
- 4 Port USB 2.0 Hub Raspberry Pi can be powered just by plugging USB input into the Raspberry Pi, don't need power in micro USB port.
Travel Charger
- 5 V 2.0 A USB Power Adapter, Amazon Link
Technika
- 5 V 1 A USB Power Adapter, model MPASS01 (B)
Trisonic
- TS-CP600T - MICRO USB HOME & TRAVEL CHARGER (5 V, 800 mA) $3 at Daiso U.S. stores.
TruePower
- U-Socket 5 V 2.1 A AC Receptacle with Built-in USB ports (2.1 A per USB port) model ACE-7169
Voltcraft
- SPS5-12W, 2500 mA, requires additional USB <-> miniUSB adapter/cable, works perfectly (bought from Conrad Shop)
ZTE
- ZTE Blade charger STC-A22O501700USBA-A 5 V 700 mA

Problem power Adapters

Nokia
- 5 V 1.2 A AC-10A & AC-10E Chargers only provide 4.8V at TP1 & TP2
- 5 V 1 A AC-16E Charger Provides only 4.7V across TP1 & TP2 when at idle

Masterplug
- Masterplug Surge Protected USB Adaptor 2 x 1 A USB Polished Black - USB ports and Ethernet don't work with this adapter and some screen artifacts using HDMI.
Monoprice
- 5 V, 2 A 3 Outlet Power Surge Protector Wall Tap with 2 Built-In USB Charger - some display artifacts, sometimes unable to find mouse, some failures to boot. Measured to less than 4.75 V between TP1 and TP2 when used with a Monoprice cable.
Sony Ericsson
- 5 V, 850 mA EP800. Some failures to boot, Ethernet loops at boot.

Working external Battery packs (with 5 V regulated output)

Anker Astro3
- Anker Astro3 10000 mAh with dual 2 A USB output
Duracell
- PPS2 Instant USB Charger
Energizer/XPAL
- XP18000 18000 mAh Power Pack
Generic - eBay no brand
- 6000T Pocket Power 5000 mAh - eBay item 271009959140
- Power Bank for iPad/iPhone 5000 mAh (looks the same as a New Trent IMP50D or TeckNet iEP380) - eBay item 280914455938
Mophie
- 38113BBR Juice Pack Powerstation 4000 mAh: output 2.1 A max: included charging cable powers RPi, 7.5 hrs light use w/keyboard and mini-Wifi on RPi ports
New Trent
- iCurve IMP70D 7000 mAh (Approx 12 hours from full charge)
- IMP120D 12000 mAh
Sinoele
- Movpower - Power Bank 5200 mAh (8 hours with Wi-Fi active)
TeckNet
- iEP387 Dual-Port 7000 mAh External Power Bank (The charging lead can be used to connect the Tecknet to the Raspberry Pi. Ran the Raspberry Pi with Wi-Fi dongle and wireless keyboard receiver for over 9 hours of light use.)
- iEP392 Dual-Port 12000 mAh External Power Bank (1 A port, ~16.5 hours)
- Rayovac PS60 5 V 800 mAh
VINZO
- Power Bank 5000 mAh Grey Output 5 V 1000 mA
Kodak Power Pack KP1000
- 1 A USB rechargeable battery pack - see Shea Silverman's blog

Read More...
http://elinux.org/RPi_VerifiedPeripherals

So, Here's what it all boils down to. From what I have read. It comes down to what was written in this Post...

"I've been using the Adafruit power supply he shows. Interestingly, it is designed to output 5.25V:

http://www.adafruit.com/products/501

This adapter was specifically designed to provide 5.25V not 5V, but we still call it a 5V USB adapter. We did this on purpose to solve a problem that occurs often with USB-powered gadgets: they draw so much current than the resistance of the cable causes a voltage drop, so instead of 5V, the device sees 4.75V or so. To avoid this problem, we made the adapter 5.25V. This is because the USB power specification allows up to 5.25V, and its safe for all 5V electronics, and has the benefit of making up for any loss due to thin USB cables. Basically, you can use it where ever USB 5V power is needed, with no risk of damage, and it will happily work at the full current range, no matter what cable you use!

Is there any downside to having a USB power supply output 5.25V? If it's within USB spec, then I wonder why all supplies without a built-in cable don't do this.

Cheers,
Drew"

Read More...
http://www.element14.com/community/thread/19035

I've been searching on this, for 4 days now!:O I don't think I want a Power Supply that needs a Separate USB to Micro USB-B Cable. Which is how the 2.5v models are made. You also have to buy a USB Cable, that goes from Micro USB-B to USB-A (both male connectors). I'm worried that it may slip out, at one end or the other. When you least expect it. And you will be left wondering what happened... One Micro USB Connection, is enough for me to deal with. They can and do come out very easily, in my experience. So, I'm leaning towards one of the Power Supplies, that have a built in Micro USB-B Cable. That is long enough for my purposes. Also, I've read that they usually have heaver gauge wire in them and can carry more currant - amperage. Than the USB-A to Micro USB-B Cables (as a general rule). I setup my own Custom Google Search, to help me find Electronics and Parts faster. I put in about 85 Electronics Sites that I have found, in it. And it seemed to Speed up my Search, giving me more related Results. And at Online Stores that I have found interesting in the Past. Weeding out all of the extra sites, that usually come up in my Google Searches. Try it out if you like, Don's Electronics and Parts Search (https://www.google.com/cse/publicurl?cx=000998905616149849377:zoir97hnuqg). Use the Search Window, below the Words, Don's Electronics and Parts ... Not the Window Labeled Google, at the Top...

Check out the Video that I mentioned above. And there's allot more info and the Links below too...

Update: (08-30-13) I finally decided on my Raspberry Pi Setup. I bought mine through Element14.com, at their Sales Site, Newark.com. And I did end up getting the Adafruit Power Suypply mentioned above. And Micro USB Cable. Since, it seems like people are having better luck with the higher 5.25 voltage, that they put out. And I couldn't find one with the Specs that I wanted with a built in Micro USB-B Cable. I wanted to buy mine from Element14 (Newark). Since they have chosen to send me a Free XBMC Bundle for Raspberry Pi Kit to Review. I put the links to what I Ordered below. I'm looking fowared to getting my new Toys. I'm Planning on Setting up my XBMC Raspberry Pi, for my Mom to Watch Online TV on. So, I'll be writing a Review and documenting the process, soon...

Don

Here's my Article on my Raspberry Pi Project...

The XBMC Raspberry Pi Solution Bundle from Element14.com - Review and First Experience by Don Bishop

RASPBERRY-PI - RASPBRRY-MODB-512M - MODEL B - Power Supply - Micro USB-B to USB-A Cable - Bought Element14 - Newark.com Site 08-30-13: 501 - ADAFRUIT INDUSTRIES - USB PORT POWER SUPPLY (AC ADAPTER | Newark; HK-US10/1 - PRO SIGNAL - CABLE, USB2.0 A MALE TO MICRO | Newark; RASPBRRY-MODB-512M - RASPBERRY-PI - MODEL B - ASSEMBLED BOARD ONLY | Newark

Update 11-24-14...

Edward, in the Comment, at the bottom of this page. Said, he was thinking of using a, 5.3V 2A Galaxy S5 charger that was designed for USB 3.0. So, I did a little research and added this info... I'm not sure, if the Raspberry Pi can handle 5.3v. Though it is very close to the 5.25v Power Supply. That I bought, for mine, http://www.newark.com/adafruit-industries/501/usb-port-power-supply-ac-adapter/dp/44W4932. Mine only puts out 1amp, though. I think that I remember seeing some more Complete Specs on the Pi, since I got mine. You should be able to find an answer to your question. On the Raspberry Pi Groups. Here, http://www.element14.com/community/community/raspberry-pi?CMP=EMC-RPiWelcome-March12 or here, http://www.element14.com/community/community/raspberry-pi/raspberry-pi-accessories or here, http://www.element14.com/community/community/raspberry-pi?CMP=EMC-RPiWelcome-March12. I did a quick search on my Google Custom Electronics Search Page, https://www.google.com/cse/publicurl?cx=00099890561614http://www.newark.com/stontronics/t5454dv/psu-raspberry-pi-5v-2a-micro-usb/dp/68X20719849377:zoir97hnuqg. And found that Element14 is now selling a 2amp Power Supply for the Pi. STONTRONICS T5454DV PSU, RASPBERRY PI, 5V, 2A, MICRO USB B. So, I'm thinking, that your Power Supply, may work. But, I would make sure, before trying it out. Since, you could blow out your Raspberry Pi, with too much Voltage. I would think, by now. That the exact info on what the new Raspberry Pi's can handle is available. I bought mine in Oct of 2013. And I know that they have made some changes to them, since then. So, make sure you find the updated Specs, before you proceed with choosing a Power Supply for which ever Model of Pi, you have...

Here's my Article on my Raspberry Pi Project...

The XBMC Raspberry Pi Solution Bundle from Element14.com - Review and First Experience by Don Bishop

Don

Best Power Supply for the Raspberry Pi

by ·17 videos

Video Link...
http://www.youtube.com/watch?v=XX3kiRUf7mg

Published on May 26, 2012

Hey Guys! Today I will be talking about the best Power Adapter for the Raspberry Pi. Please do not forget to Subscribe and Like this video! Thank you very much!

Here is the link to the Power Adapter I bought: https://www.adafruit.com/products/501

Here is the link to the A to micro-B USB cable I bought: https://www.adafruit.com/products/592

Rubber Feet: https://www.adafruit.com/products/550