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Old September 27th, 2007, 20:59   #1
Shrapnel[Op-For]
 
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Battery charging question

As we speak my 8.4v battery is charging. It is plugged into a voltage converter (its from overseas) and started charging about an hour ago. I searched the forums for answers, and look at the "battery FAQ" but i am having trouble figuring out how to calculate the time to charge the battery. Here is the info on the battery:

Input: AC 220v 50/60 hz

Output: DC 8.4v 250 ma

And the battery says its 1.2v each, and 1300ma.

Any help on how long it will take to charge, or how to figure out how long it will take is much apreaciated. Also, this is the first time this battery will be charged.
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Old September 27th, 2007, 21:04   #2
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5~6 hours. If the out put is 250mah
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Old September 27th, 2007, 21:36   #3
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Probably around 5-6 hours like Skladfin mentioned but don't suspect it to be completely charged by then. For some reason it takes all the batterys I get around 12 hours for no appearent reason
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Old September 27th, 2007, 21:53   #4
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Your charger is 220 volt? Your outlet at home is 110 volts. See a problem here?

If your converter does work, just divide your battery's amperage by the amperage of the charger.

Like in the FAQ, it's highly suggested to get a decent guess-proof charger.
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Old September 27th, 2007, 22:09   #5
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Geylocks you mean MAH right?
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turns out i had to take the battey out of the stock and charge it right from the battery wire..not the wire that connects to the gun
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Old September 28th, 2007, 01:28   #6
Shrapnel[Op-For]
 
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so if i calculated it right.. it should take 6.5 hours?
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Old September 28th, 2007, 01:32   #7
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How the hell did you get that number...

1300 divided by 250 = 5.2 hours = 5 hours and 15min approx.

Are you failing math course or what.
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Old September 28th, 2007, 01:34   #8
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A charger that puts out 8.4V isn't going to charge an 8.4V battery.
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Old September 28th, 2007, 01:38   #9
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Originally Posted by Mantelope View Post
A charger that puts out 8.4V isn't going to charge an 8.4V battery.
What the hell are you talking about...

I think you have it confused with the input.

Output value of the charger IS the voltage of the battery.

Anyone tried charging an 8.4v with 120v charger =)?
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Old September 28th, 2007, 01:50   #10
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Quote:
Originally Posted by Skladfin View Post
What the hell are you talking about...

I think you have it confused with the input.

Output value of the charger IS the voltage of the battery.

Anyone tried charging an 8.4v with 120v charger =)?
Most chargers I've seen that charge an 8.4v battery put out between 9 and 13 volts. Otherwise the battery would be "pushing back" with the same force that the charger is using, and hence no charge. Am I wrong? (I know this is very simplified... but yea...)
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Old September 28th, 2007, 01:55   #11
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No, you're right. 8.4V is how much the battery will put out when it's 100% drained... If you're going to charge it, you need to apply a greater potential difference in order for the chemistry to actually store a charge.
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Old September 28th, 2007, 02:43   #12
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Took the battery of the charger. Works great, but because i didn't want to annoy people and start a new thread.. when my gun in on semi auto, i can hold down the trigger, and it shoots one, and then one, like normal, but then, after the third shot, it shoots on full auto.. I don't know why, but has anyone experienced this with their guns before? (my guns a jg m4a1 btw)
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Old September 28th, 2007, 03:15   #13
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Quote:
Originally Posted by Mantelope View Post
No, you're right. 8.4V is how much the battery will put out when it's 100% drained... If you're going to charge it, you need to apply a greater potential difference in order for the chemistry to actually store a charge.
This is true. My charger pushes around 10-10.5v charging my 8.4v battery.
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