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Old 02-14-2005, 12:42 AM   #1
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Default Can I charge a battery while wired to my ESC?

Hey all,

I'm looking at a shot of Baker's car from the 'birds... and it looks like he's got a battery pack installed in his car and hooked up to his speed controller and is charging it.... Can I charge my battery while it's wired to my Quantum 2?

Man, that'd save me some time if I could...
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Old 02-14-2005, 12:51 AM   #2
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I peak them attached to my speed control. and have charged if i had to get on the track in a hurry.
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Old 02-14-2005, 02:31 AM   #3
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as long as you don't turn the ESC on!

I'm doing it with my Q2 right now, and done it with every ESCs I've owned in the past with no problems. I solder my pack in the car, sauce the tires, then re-peak right before my heat (while batteries are soldered up to the ESC). I didn't know there was anyone who wasn't doing it?
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Old 02-14-2005, 03:37 AM   #4
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Default Re: Can I charge a battery while wired to my ESC?

Quote:
Originally posted by Bob Nilsen
Hey all,

I'm looking at a shot of Baker's car from the 'birds... and it looks like he's got a battery pack installed in his car and hooked up to his speed controller and is charging it.... Can I charge my battery while it's wired to my Quantum 2?

Man, that'd save me some time if I could...
Yeah man...it's not a problem...you can charge the whole pack while it's sitting in your car all hooked up.

Us 1/12th guys do it all the time too...if not..we'd have to de-solder everytime we charge. And that would SUCK!
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Old 02-14-2005, 09:34 AM   #5
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It seemed a little dangerous to me too when I first saw it. It's the reason I shyed away from ESCs designed for direct solder connections. But it seems simple enough that since the ESC switch is a hard disconnect (unlike say a computer power switch) it wouldn't be a problem. Only issue left is, with a direct solder connection you have to run one pack and can't immediately swap out for a fresh pack. That's more an endurance/sport/fun issue, and you're supposed to let the motor cool between packs anyway.

Is there anything to the notion that you shouldn't leave a pack connected to the car for a long time, and you need to store the battery seperately? I kept mine unplugged, but sitting in the car's holder just for convenience.
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Old 02-14-2005, 10:23 AM   #6
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The only speedo i know didnt like to be "charged" was the tekin
410k the one with the keypad good speedo. Peak your batterys hit the track it would lock full throttle.
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Old 02-14-2005, 03:19 PM   #7
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It doesn't really take me much more time to desolder/solder my packs than my friend who uses bullet connectors. I don't really think it's a time issue.

I do "punch" my packs just prior to racing with them connected. No problems.
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Old 02-14-2005, 04:35 PM   #8
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the main thing here is not to turn the esc on and you should be fine, me too runs 12th scales and i do it all the time with my gt7. that way i dont have to stuggle strapping my batteries in when its my turn.
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Old 02-14-2005, 05:36 PM   #9
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Thanks all!
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Old 02-14-2005, 06:17 PM   #10
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Quote:
Originally posted by Bob Nilsen
Thanks all!
I like the avatar comrade!!!
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Old 02-14-2005, 06:50 PM   #11
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Why does everybody say it's OK as long as the esc is turned off? The switch on the esc does not cut the power from the batteries only the power to the rx. Personally I wouldn't risk it.
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Old 02-14-2005, 06:57 PM   #12
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where can I find pictures from the bird's
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Old 02-14-2005, 07:09 PM   #13
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Quote:
Originally posted by newracer
Why does everybody say it's OK as long as the esc is turned off? The switch on the esc does not cut the power from the batteries only the power to the rx. Personally I wouldn't risk it.
Think of it like this.

It's perfectly ok to put a charged battery in your car right?

Well...all your doing is sending current to the battery when it's charging. The speedo's fets are not active when switched off therefore they simply do not conduct electricity, thats why the fets are sometimes reffered to as "gates."

It simply doesn't hurt speedos. Thats it.
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Old 02-14-2005, 08:19 PM   #14
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You are still sending over 9 volts to parts of the esc. A freshly charged pack will not deliver over 9 volts, even right at the start. Why risk it? Even if you just remove one wire from the pack that would stop the current.
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Old 02-14-2005, 08:50 PM   #15
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Quote:
Originally posted by newracer
You are still sending over 9 volts to parts of the esc. A freshly charged pack will not deliver over 9 volts, even right at the start. Why risk it? Even if you just remove one wire from the pack that would stop the current.
It depends on the ESC. Most of em have a power switch that simply cuts the battery power to the ESC. If there's no circuit through the ESC, there's no current flow.
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