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Old 10-16-2010, 05:59 PM   #31
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I've seen this myself with my Kindle 2 when plugged into certain USB chargers. The USB spec says they can supply a max of 1500mA for a USB charger. My thought is that ones that don't meet that spec have an auto-cutoff for devices trying to draw more current than they can supply to prevent damage to the charger. I'd say find one that is rated at least at 550mA. If it isn't rated at all it probably supplies less than that and although it may work for some devices it is probably insufficient for the Sony.

It is unlikely that any of these chargers would damage the Sony as long as they are within the voltage specification which allows for a maximum of 5.25v. It is more likely the Sony could damage the charger if they didn't have a limiter built into it.

I've tried a couple of generic USB chargers with the Sony cable. One rated at 550mA for my BlueAnt hands-free and the other at 800mA for my Nyko PS3 controller charger. Both indicted they were charging the unit, however the Nyko charger made the Sony act like it was plugged into a computer. In other words I could not read while it was charging.

I also tried it with a "Monster GreenPower™ Digital PowerCenter™ MDP 900" that had a built in USB charging port. The Sony acted like it was plugged into a PC and was not charging the battery. I'm sure it was supplying the correct voltage as it has to be the standard 5V, but I could not find anywhere on the unit or the manual what current it is capable of supplying. I suspect if you find one rated at 500mA to 1500mA it will probably work, but it could be hit or miss.

I suggest if you have any USB chargers lying around to just try them. If you don't see it charging in a few moments, then it probably won't work.

I have seen a few chargers actually drain the batteries of USB devices because although they would not charge, they didn't allow the device to go into sleep mode either.

Etienne66

Last edited by etienne66; 10-16-2010 at 06:05 PM.
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Old 10-16-2010, 06:28 PM   #32
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I should have read that Wikipedia article a bit more.

Quote:
Charging Specification, the USB specification required that devices connect in a low-power mode (100 mA maximum) and communicate their current requirements to the host, which would then permit the device to switch into high-power mode.
...
There are also devices at the host end that do not support negotiation, such as battery packs that can power USB-powered devices; some provide power, while others pass through the data lines to a host PC. USB power adapters convert utility power and/or another power source (e.g., a car's electrical system) to run attached devices. Some of these devices can supply up to 1 A of current. Without negotiation, the powered USB device is unable to inquire if it is allowed to draw 100 mA, 500 mA, or 1 A.
It sounds like some of these chargers probably don't allow for negotiation and the Sonys appear to require it.

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Old 10-22-2010, 08:33 AM   #33
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When I tried to connect my husband's new Sony 650 with the Sony cable, to a generic AC adapter, the Sony screen had a message that the unit could detect no "power source".

The necessity of having to purchase an actual Sony adapter is, to my mind, very annoying ... and had I known that, I might have rethought my purchase.
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Old 10-22-2010, 08:35 AM   #34
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Originally Posted by hpjrt View Post
When I tried to connect my husband's new Sony 650 with the Sony cable, to a generic AC adapter, the Sony screen had a message that the unit could detect no "power source".

The necessity of having to purchase an actual Sony adapter is, to my mind, very annoying ... and had I known that, I might have rethought my purchase.
Have a look at this one. People say Kindle chargers work with Sony.
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Old 10-22-2010, 08:54 AM   #35
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Don't see where necessity to buy Sony AC adaptor comes in... read some more of this and several other threads relating to PSUs and you'll find lots of alternatives, all cheaper than Sony...


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The necessity of having to purchase an actual Sony adapter is, to my mind, very annoying ... and had I known that, I might have rethought my purchase.
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Old 10-22-2010, 10:55 AM   #36
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yea its not actually 'necessary'. The usb cable it comes with works fine anyway. Its just a convenience.

That said, I do think at $240 it would have been nice for them to throw in both a cover and an ac adapter, when competing readers are half the price (nook, kindle, etc).

Although to their credit they did throw in the cover, with the ongoing promotion of the free lighted cover.
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Old 10-29-2010, 10:01 AM   #37
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I will be trying the AC adapter for my mom's cell phone this weekend. It uses the same USB connector. If it works and the specs are good enough, I can buy one of those.
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Old 11-05-2010, 08:02 AM   #38
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I read somewhere on these forums that a Blackberry charger worked for the Sony PRS 650 ... and since my son has had several versions of Blackberry, I asked if he had an extra AC charger. He did ... I got it ... and it works beautifully ...

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Old 11-05-2010, 08:39 AM   #39
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I received 650 yesterday. Didn't have time to play with it, but I tried to charge it. It had 3 bars, so I plugged in a USB charger that was a part of logitech mouse kit and it charged the reader. How well did it do it? No idea. I wonder whether it can damage the battery if it is not the exact specs?
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Old 11-05-2010, 08:55 AM   #40
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Quote:
Originally Posted by astra View Post
I received 650 yesterday. Didn't have time to play with it, but I tried to charge it. It had 3 bars, so I plugged in a USB charger that was a part of logitech mouse kit and it charged the reader. How well did it do it? No idea. I wonder whether it can damage the battery if it is not the exact specs?
you really shouldnt plug in any old charger willy-nilly, you should at least verify that the voltage is correct (5v in this case) and that the current (mah rating) is between 500 and 1500 mah.

I once accidentally plugged in my netbook's power adapter into my wireless headphones to charge them, and they basically blew up (I heard a pop, smelled smoke, and yea, the headphones never worked again). Even tho the connector 'fit' into it perfectly (which is why I accidentally did it). Let that be a lesson to everyone out there.

Last edited by ebooker; 11-05-2010 at 08:58 AM.
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Old 11-05-2010, 09:11 AM   #41
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Originally Posted by ebooker View Post
you really shouldnt plug in any old charger willy-nilly, you should at least verify that the voltage is correct (5v in this case) and that the current (mah rating) is between 500 and 1500 mah.

I once accidentally plugged in my netbook's power adapter into my wireless headphones to charge them, and they basically blew up (I heard a pop, smelled smoke, and yea, the headphones never worked again). Even tho the connector 'fit' into it perfectly (which is why I accidentally did it). Let that be a lesson to everyone out there.
It says on the charger
Code:
Direct Plug in AC/DC
Input: 100-240 V, 50-60 Hz, 013A
Output: 5.15V, 1A
Dunno whether it is good or not.
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Old 11-05-2010, 10:41 AM   #42
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There's a slight difference with USB/mini/micro USB connections... they are USB! This is a standard... they are all in the 5-5.2v range and current is irrelevant as long as there is enough (minimum should be 500mA more is better), devices take what they need not what's available. Something needing 1,000ma won't blow if the charger can provide 2,000mA, it'll get what it needs and the charger will be happy because it isn't overloaded

Previous problems with chargers for other kit involved the fact that the connectors may have been standard sizes but there was no standard for voltage so you coul have identical barrel connectors on chargers which offered anything from 3v to 25v... not good as you found but doesn't apply to USBs of whatever size. Only problem comes from whether PSU is set to act as pure PSU or computer USB... both work with 350-950 but one allows you to read whilst charging whereas the other acts like you plugged into computer and may not charge. Check the forums for info from people who hav tried various PSUs.


Quote:
Originally Posted by ebooker View Post
you really shouldnt plug in any old charger willy-nilly, you should at least verify that the voltage is correct (5v in this case) and that the current (mah rating) is between 500 and 1500 mah.

I once accidentally plugged in my netbook's power adapter into my wireless headphones to charge them, and they basically blew up (I heard a pop, smelled smoke, and yea, the headphones never worked again). Even tho the connector 'fit' into it perfectly (which is why I accidentally did it). Let that be a lesson to everyone out there.
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Old 11-05-2010, 11:16 AM   #43
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Quote:
Originally Posted by astra View Post
It says on the charger
Code:
Direct Plug in AC/DC
Input: 100-240 V, 50-60 Hz, 013A
Output: 5.15V, 1A
Dunno whether it is good or not.
have you tried it yet? technically the voltage and current numbers are right (1A=1000mah) tho there may be other considerations as people have mentioned in this thread.

FWIW, the one i bought on ebay for $4.49 shipped, works great. It was titled "Dual 2 Port USB Wall AC Charger Adapter for iPhone iPod", from seller named 'eforcity-select'. Specs on it are: "Input: AC 100 - 240 V
Output: DC 5 - 5.5 V / 1000 mA".
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Old 11-05-2010, 11:20 AM   #44
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I received 650 yesterday. Didn't have time to play with it, but I tried to charge it. It had 3 bars, so I plugged in a USB charger that was a part of logitech mouse kit and it charged the reader. How well did it do it? No idea. I wonder whether it can damage the battery if it is not the exact specs?
It had 3 bars, after an hour I had 4 bars and the red light went off.
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Old 11-05-2010, 12:33 PM   #45
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It had 3 bars, after an hour I had 4 bars and the red light went off.
sounds like its working fine...
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