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Old 06-27-2006, 03:08 PM   #1 (permalink)
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Is my car charger for the Razor an approved device to charge the 8700g?

I am loving this device, so I AM a little hesitant to compromise it with downloaded "must have" applications, are there any bullet proof applications?
Obviously i am new to this device, I want to operate on the reliable aspect of the curve!
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Old 06-27-2006, 04:33 PM   #2 (permalink)
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nope...had a client do that and messed up the device
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Old 06-27-2006, 05:56 PM   #3 (permalink)
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Quote:
Originally Posted by halogen
Is my car charger for the Razor an approved device to charge the 8700g?

I am loving this device, so I AM a little hesitant to compromise it with downloaded "must have" applications, are there any bullet proof applications?
Obviously i am new to this device, I want to operate on the reliable aspect of the curve!
I have used my Razor V3x car charger and normal charger with my 8700f with no snags at all. At the end of the day its just a USB conection.
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Old 06-27-2006, 08:16 PM   #4 (permalink)
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Your wrong. Don't answer if you don't know...
Quote:
Originally Posted by bclopez
nope...had a client do that and messed up the device
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Old 06-27-2006, 08:24 PM   #5 (permalink)
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Yeah, I've used my husband's RAZR car charger and vice versa. No big deal. And I've used the RAZR wall charger as well as the wall charger for my H500 BT headset to charge the 'Berry. It works and it hasn't seemed to cause any problems. Like grffnjnr said, it's just a mini-USB connection.
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Old 06-27-2006, 09:14 PM   #6 (permalink)
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I use my old RAZR charger all the time. Works great for me.
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Old 06-27-2006, 09:49 PM   #7 (permalink)
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I've done this also...no problems.
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Old 06-27-2006, 09:50 PM   #8 (permalink)
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I used by USB cord to charge my H500 headset today. USB is USB.
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Old 06-27-2006, 10:07 PM   #9 (permalink)
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Well -is that it? USB is USB? Aren't differing values between the razor and the 8700? This is a great unit, I don't want to mess it up. So are the electrical values the same, anyone????
Thanx in advance
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Old 06-27-2006, 10:54 PM   #10 (permalink)
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USB specifies the pins and the voltages... no problem.

brand new = still in warranty = no worries, as long as you don't obviously wreck it, right?
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Old 06-27-2006, 11:03 PM   #11 (permalink)
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The ONLY reason i have the razr is because I can use the same home/car charger, makes life easier. No problems at all.
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Old 06-27-2006, 11:38 PM   #12 (permalink)
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Okay boys and girls play nice... dads home!!!!

Is USB just USB? No.

The connector is the same... the voltage is the same...but the amperage is NOT!

In the case of the RAZR charger, if it's an OEM motorola SYN0847, then I would say okay. If it's an aftermarket RAZR compatible then No-Go.

The BlackBerry is designed to work with 500-750mAH of current which the V3 charger falls into. The OEM BB charger for the car is 500mAh output and the RAZER is 750 - there you go. Going beyond 750mAh your playing with fire.

So other USB chargers like an T-Mobile MDA (HTC) puts out a whopping 1000mAh (1 amp) of current... it will charge the BB allright but the battery gets so hot that I wouldn't leave it unattended. Batteries die an early death from heat, a byproduct of the charging cycle but we live with it. Done [charging] improperly you will degrade the overall life of your battery.
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Old 06-27-2006, 11:41 PM   #13 (permalink)
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Quote:
Originally Posted by jsuen
USB specifies the pins and the voltages... no problem.

brand new = still in warranty = no worries, as long as you don't obviously wreck it, right?
I haven't met a BB user yet that was okay with warranty "repairs"... do you want to be without your BlackBerry for a week and a half? There are always refurbs I guess.
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Old 06-28-2006, 03:53 AM   #14 (permalink)
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Default "Dad's home" is right!

Thanks Daddio.

Very nicely put, both the amperage and the advice to the over-optimistic among us.

thanx again
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Old 06-28-2006, 05:35 AM   #15 (permalink)
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Um. High school physics was a couple years ago, but I believe your logic is flawed.

Ohms law: I = V/R

If voltage and resistance are fixed, the current doesn't change. The ratings you see are the maximum sustained output of the charger. There is no absolute output number...it always fluctuates with the load placed on the circuit. As long as you don't exceed the maximum output of the charger, nothing should blow up.
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Old 06-28-2006, 09:36 AM   #16 (permalink)
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Quote:
Originally Posted by stealthx32
Um. High school physics was a couple years ago, but I believe your logic is flawed.

Ohms law: I = V/R

If voltage and resistance are fixed, the current doesn't change. The ratings you see are the maximum sustained output of the charger. There is no absolute output number...it always fluctuates with the load placed on the circuit. As long as you don't exceed the maximum output of the charger, nothing should blow up.

Sorry but your statement " As long as you don't exceed the maximum output of the charger, nothing should blow up." doesn't work. Your assumption that the phone is just a resistor is too simple. Put a 5 amp current (charger) to your Blackberry and see what happens. Hey you haven't exceeded the max output of the charger but your phone melted.

RIM (et al) design the phones (and chargers) with charging circuits to vary the load over time. Of course as the battery becomes charged its resistive value changes as well. These designs are based on certain input current parameters, both raw amperage and consistency of that current. When the current value is unexpectedly varied or changed the narrow operation range of the phones charging circuit doesn't have the ability to dynamically cope and damage can occur.

Besides maximum current requirements there are also minimum requirements... try charging your RAZR from a BlackBerry car charger. No go.
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Old 06-28-2006, 09:51 AM   #17 (permalink)
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I stand corrected! I was naive enough to think that just because the connector was the same, it would charge the same. Thanks for edu-macating me
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Old 06-28-2006, 03:40 PM   #18 (permalink)
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Yeah, me too, thanx for edumacating me.
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Old 11-19-2006, 09:31 PM   #19 (permalink)
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Quote:
Originally Posted by rcg
Sorry but your statement " As long as you don't exceed the maximum output of the charger, nothing should blow up." doesn't work. Your assumption that the phone is just a resistor is too simple. Put a 5 amp current (charger) to your Blackberry and see what happens. Hey you haven't exceeded the max output of the charger but your phone melted.

RIM (et al) design the phones (and chargers) with charging circuits to vary the load over time. Of course as the battery becomes charged its resistive value changes as well. These designs are based on certain input current parameters, both raw amperage and consistency of that current. When the current value is unexpectedly varied or changed the narrow operation range of the phones charging circuit doesn't have the ability to dynamically cope and damage can occur.

Besides maximum current requirements there are also minimum requirements... try charging your RAZR from a BlackBerry car charger. No go.
Oh, good grief. The output current rating denotes the capability of the charger - the charger does not "force" that amount of current into the device. The charger should be capable of providing the amount of current that the device requires as a load; otherwise, the device will overload the charger. Many chargers have current limiting circuits so that you cannot burn out the charger. A Razr V3 charger can supply up to 550ma of current. A Blackberry travel charger, with the USB cable and interchangeable plug adapters, can supply up to 500ma while the newer travel chargers with the folding plugs can supply up to 750ma. I always use the higher output charger for the V3 and Blackberry. Doing so will work fine.

Note, if you do not use a charger that can supply sufficient output to a device, the device will either charge very slowly or, in the case of a V3, will just not charge.
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Old 11-20-2006, 01:09 AM   #20 (permalink)
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Another point of proof -

Try plugging your RAZR into your BB charger.

It won't work. The phone alerts you to the fact you have an unauthorized charger.

I'm not a physics expert or an electrical engineer, but I wouldn't do it.

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