Interchangeable Battery Chargers

I have a wide array of battery chargers for various devices including cell phones and blue tooth ear pieces.  Do anyone know if these can be interchanged?  Do you have to use the charger that specifically came with your device even if they have the same type of plug?  I have a Motorola ear piece and the back says "input 100-240v - 50/60 hz, and my Blackberry says they same thing.  For outbput the motorola says 5v -- 550mA and the Blackberry says 5vc.c. 0,75A for output.  
sueflemkeAsked:
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CallandorConnect With a Mentor Commented:
>epoxy on the windings and balancing it first would've helped, I admit

No kidding - an unbalanced motor at high rpms will destroy itself.  Less current just means it probably doesn't reach maximum rpm and self-destruct.  If potentially providing more current was a problem, anyone who installed an expensive high current power supply would regret it, but no one recommends against such a practice - it's the cheapo low end power supplies that cause problems.  A higher current rating does not mean more current is always supplied; it means more is available if needed.

The Motorola and Blackberry use the small trapezoidal connector commonly found on some USB cables, so polarity is not an issue.  It is designed to be hooked up to a PC.
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shawnlehnerCommented:
The short answer to your question is no. Those specifications are basically saying that your blackbarry charger outputs 750mA while your motorola charger only outputs 500mA. Now this could have a problem in various ways; the motorola charger may no correctly charge your blackberry (which was the case when I attempted it with my blackberry pearl) and the blackberry charger may be too powerful for your motorola device and cause some permenant damage.
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CallandorCommented:
I disagree - you can always plug a charger in that is rated for more current, as long as the voltage is the same.  The device will draw as much current as it needs, and since a lower rated charger can provide the needed current, a higher rated one will also.  Think of it as powering a 12v device with a car battery instead of 8 AA batteries - it will work fine.  The battery does not "push" more current just because it has a larger capacity.

I have tried the Motorola Razor/Blackberry charger exchange and in my case, the Motorola charger output 800mA and the Blackberry charger output 500mA.  The Motorola charger charges the Blackberry without a problem, but it doesn't work the other way around.
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_Commented:
I am with Callandor.
I have not done that particular charger swap, but I have don my fair share of adapter hacking. For the most part, same output volts with more amps than the device states, usually works OK (just keep an eye on things if the amps are a lot more. it might charge faster than expected).
Using same volts with less amps, doesn't do so well.

I haven't fried anything yet (as long as I make sure the positive and negitive are hooked up correctly).
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Darr247Commented:
> For outbput the motorola says 5v -- 550mA and the Blackberry says 5vc.c. 0,75A for output.  

5v -- says DC to me, but 5vc.c looks like it could be AC. Be very careful. Just because the tips _look_ the same doesn't mean they are. Even if they're both outputting DC the tip polarity could be different.

If you want a single charger, get something like an iGo with interchangable tips.
Or at least go to their web site (igo.com) and see what their compatibility guides say as far as tips for each device. If they both use the exact same tip then they can probably both use the 0.75A charger you have. If they use different tips, it could be their polarity is different, or it could be one is AC instead of DC.

The others have never spun the wires right off the armature of a rewound motor by hooking it up to a car battery or the comparison between that and AA cells wouldn't have been made. (epoxy on the windings and balancing it first would've helped, I admit.)
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Darr247Commented:
For the Motorola bluetooth devices, all ROKR, RazrWire, T305 and models that start with a single 'H' (except one) take the iGo A32 tip. H800 being the exception, which takes the A97 tip.
The HS and HF models all take the A10 tip, which is the same clip-on 3-4 pin tip most Motorola cell phones use (horrible interface unless you get the desktop cradle the phone/device stands in while charging... I've never seen a Motorola brand clip-on plug that didn't lose tension and stop charging after a few months; the iGo A10 tip is only slightly better).

All of the Blackberry models that I checked (5790, 6230, 6510, 7100t, 7250, 7520, 8100g, 8707g, 8800g, 8830, Curve 8320 and Pearl 8130) use the A29 tip, which is not the same as the A32 tip according to iGo's tech support, even though they 'look' the same.

Now I'm as suspicious as the next person that iGo would SAY the tips are different just so people have to buy more of them... still, since they don't use the same tip and I can't acquire empirical data on them myself with a meter, scope, amprobe, etc., I'd say the chargers that came with them should not be used on each other, either. :-|

I did call Mobility's 888 number listed on igo.com to complain about the so-called data sheet (PDFs) available for download on every tip page not having any actual 'data' in them. (Nothing more than 1-page flyers hyping the tips' utility while not revealing any useful info about them.) But that didn't really get me anywhere. Heh.
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CallandorCommented:
You just never can tell with some of these manufacturers.  I know that both the Razr and the Blackberry were intended to be connected to a USB port, so electrically they have to be compatible.  The difference is in the charging current, which I observed works with the more powerful charger for either device.
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sueflemkeAuthor Commented:
Wow!  I'd like to thank all of you for your excellent input.  It sounds like I would be better off using the chargers which came with the devices!  Intersting thread of IM's here, though.  I am always so pleased with the answers to my questions here at Experts-Exchange.  
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_Commented:
>> better off using the chargers which came with the devices

Always the best idea.
I get a lot of ..errr.. second hand stuff, so I have to get 'creative' to power up things to test them.
Enjoy.  : )
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Computer101Commented:
Are we sure we accepted the proper answer.  If so, or not, let me know please.

Computer101
EE Admin
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_Commented:
I'm OK with it.
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CallandorCommented:
What we have is an assisted comment that says you should not use a lower current charger than the original, which I am in agreement with.  The accepted comment, however, doesn't say anything definitive, except that one particular manufacturer chose to use different tips for different devices.  No information was available as to what the actual current each tip provides, nor much of any hard facts.  So while it is okay to play it safe and stick with the original charger, the accepted comment does not definitively answer the questions posed, "Do anyone know if these can be interchanged?  Do you have to use the charger that specifically came with your device even if they have the same type of plug?"  My position is that chargers can be interchanged in real life, as long as enough current is provided and the voltage and polarity are the same.  I have actually done this, and so have many others, so this is not a theoretical guess.
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Darr247Commented:
Hey Computer101,

Callandor can have my poinx for this question if you can do that... it doesn't really make a difference to me; I didn't know that could even be done.

Can you change grades, too? If so, maybe I should go back and complain about the guy whose questions I answered correctly and completely yet he gave me a C 'cause it apparently wasn't what he wanted to hear.
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CallandorCommented:
Thanks for being gracious, Darr247; I think the database will benefit from having as complete an answer as possible.

Yes, you should complain about the C grade if you answered a question accurately.  Send me an email (it's in my profile) with the question and I can look into it if it is hardware-related, since I am the Zone Advisor.
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sueflemkeAuthor Commented:
I guess my feeling was that I should play it safe.  In my original question I gave the specifications for the two rechargers, which are not the same.  I am obviously not super technically inclined, so I chose the answer that made the most sense to me, and play it safe.  Shawnlehner commented that to be on the safe side you should only use the rechrager that came with the particular device.  Dar247 said that the two tips may look the same but that the way they function is not the same.  Callandoor's comments made sense, too, but I don't really understand which recharger is more powerful than the other.  One is for the Blackberry and one is for a Motorola blue tooth ear piece.  Not really understanding all that was described, and not wanting to ruin my devices, I had to choose the best answer as far as I understood them.  In other words, I'm embarassed to say that some of the answers were over my head so I chose what seemed to be the safest ones.
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CallandorCommented:
sueflemke,

If you don't understand a comment or if it seems to be over your head, just ask - we're all here to learn, as well as to help others.  No matter how technically adept one may be (or how little), there are opportunities to pass on knowledge.
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NetminderCommented:
Force accepted.
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