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-   -   What is TP's voltage? (http://forum.ppcgeeks.com/showthread.php?t=50693)

[sammich] 01-01-2009 01:07 PM

Re: What is TP's voltage?
 
Quote:

Originally Posted by mmtbb (Post 611763)
quick question. I have 4 AA 1.2v 2500 mah rechargable batteries in a battery pack.

If I plugged this in to a device, what would the constant current be?

4.8V

If they are 1.5V batteries, then it would be 6V

mmtbb 01-01-2009 01:11 PM

Re: What is TP's voltage?
 
Sorry, I thought current was in mA not volts.

What would the constant mA be at any given time?

[sammich] 01-01-2009 01:13 PM

Re: What is TP's voltage?
 
MAh is the capacity of the battery.

It's kinda strange how it all works. For voltage, you multiply the voltage by the number of cells to get the total voltage of the power source. For MAh, the value stays the same when all of the cells have the same value.

mmtbb 01-01-2009 01:27 PM

Re: What is TP's voltage?
 
right, not mAh (isn't mAh how many amps can ge transfered in one hour?), I want to know the constant amperage that is flowing at any given time.

For instance, the TP sounds like it has a maximum of 1 amp at any given time. More than this will hurt the TP. So if I put these batteries together, how can I know the amps it is giving off, and if it is more than 1 amp. does that make sense?

guitardoc64 01-01-2009 01:44 PM

Re: What is TP's voltage?
 
Quote:

Originally Posted by saumaun (Post 611786)
MAh is the capacity of the battery.

It's kinda strange how it all works. For voltage, you multiply the voltage by the number of cells to get the total voltage of the power source. For MAh, the value stays the same when all of the cells have the same value.

***Warning! Science Content***
Depends on whether the batteries are in series or parallel. Parallel connections would multiply current while dividing voltage whereas series connections limit current due to internal resistance of the cells but the voltage adds.

gator352 01-01-2009 01:50 PM

Re: What is TP's voltage?
 
Quote:

Originally Posted by mmtbb (Post 611763)
quick question. I have 4 AA 1.2v 2500 mah rechargable batteries in a battery pack.

If I plugged this in to a device, what would the constant current be?

I wouldn't even try unless the device was set up to accept that form of current. 4 AA nickel metal hydride batts (2500 mAh) will put out more current (amps) than the 1340 mAh batt the TP/Diamond uses unless it was used in conjunction with some sort of a regulator. The batts in our phones have a current regulator built in as to not overload with too much current at one time. This goes primarily for all hand held devices. For PC's, the regulators are in the power supply and on the MB so the current comming in doesn't turn your PC into a glob of goo or a blazing inferno.

So it doesn't really matter what the constant would be, It just flat out wont work or it will fry the inards of the device you plug it into.

Baffles 01-01-2009 01:54 PM

Re: What is TP's voltage?
 
"mah" is milli-ampere hours. That is the capacity of the battery. 2500 mah means the battery can put out 2.5 amps for 1 hour, or 1.25 amps for 2 hours, etc (roughly).

As far as amperage goes, you can't force more amperage into the phone than it will take. You can force more voltage in. As long as you take care to only feed it 5 volts, the phone will limit its amperage consumption, if necessary.

dan-htc-touch 01-01-2009 02:05 PM

Re: What is TP's voltage?
 
go to your local electronic supply, that they will have 5v regulators you can use, they will be able to step up or step down whatever voltage your battery set is putting out.

gator352 01-01-2009 02:17 PM

Re: What is TP's voltage?
 
Quote:

Originally Posted by Baffles (Post 611893)
"mah" is milli-ampere hours. That is the capacity of the battery. 2500 mah means the battery can put out 2.5 amps for 1 hour, or 1.25 amps for 2 hours, etc (roughly).

As far as amperage goes, you can't force more amperage into the phone than it will take. You can force more voltage in. As long as you take care to only feed it 5 volts, the phone will limit its amperage consumption, if necessary.

Correct. Think of it like a car batt. You can have a batt with 550, 620, 690, 720 and higher cold cranking amps to start your car , as long as it's 12 volts. But here's the misnomer....if you put a 800 cca batt in your car but your alternator's regulator only accepts 600 amps, you take a big chance losing alternator life drastically as the resistors will start to burn out causing failure.

Depending on what the TP threshold is for amperage, you take a chance on burning it out. The phone will regulate amperage consumption to a certain point but you still can't feed it 10 amps if it calls for 5.

mmtbb 01-01-2009 02:19 PM

Re: What is TP's voltage?
 
Quote:

Originally Posted by Baffles (Post 611893)
"mah" is milli-ampere hours. That is the capacity of the battery. 2500 mah means the battery can put out 2.5 amps for 1 hour, or 1.25 amps for 2 hours, etc (roughly).

As far as amperage goes, you can't force more amperage into the phone than it will take. You can force more voltage in. As long as you take care to only feed it 5 volts, the phone will limit its amperage consumption, if necessary.

Ok, this is what I was looking for! Someone in the thread mentioned that I needed to watch the amperage and NOT the voltage. THis was completely backwards to what I thought. This is what has confused me. Your description is exactly what I needed to hear.

So, these rechargable batteries will put out 2.5 amps constantly for one hour? Even if my voltage is 5v, won't the 2.5 amps burn out the resistor in my TP?

THANKS!


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