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HomeRC & Power✈️Aircraft🚁Helicoptere-Electric Battery-Charger-pSupply › Charging from a Car Battery
06-20-2009 07:56 AM  11 years ago
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Terrabit

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Seattle, WA - USA

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Charging from a Car Battery
I need to know if I can safely charge two 10s 4200's via two TP1010C'S simultaneously. should it be running or not? Should I run only one at a time?

Thanks!
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06-20-2009 02:17 PM  11 years ago
TJinGuy

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Socorro, NM - USA

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Nope, absolutely not with the car off. Most car batteries are between 25Ah and 35Ah. Each of those batteries is equal to about 11.2Ah at 12V. If you charge them both off a fully charged car battery then you will likely not be able to start the car afterwords and it will definitely not be good for the battery. Not to mention the voltage would likely drop low enough under load to stop the charging.

But if you idle the car while charging then yes, it would work fine. You still need to watch the voltage though. Last weekend I was charging one of my 8s 5000 off my car at 7.5A and by the end of the charge the voltage was near 10V under load. Even with the car idling the voltage was only 12.3V, much lower than without the battery charger attached.
- Chris

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TJinTech
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06-22-2009 02:33 AM  11 years ago
Terrabit

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Seattle, WA - USA

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Okay, I was camping and my PowerForce 40amp power supply blew up. So I charged four 10s 4200's from my truck battery at 4amps using two TP1010C's. The engine was not running. It started afterward without hesitation. I would rather not have to do that but it's good to know it will work.

I was concerned about possibly damaging any electronic componentry of my truck by charging while running the engine. Is this a misplaced concern?
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06-22-2009 11:49 PM  11 years ago
fergus

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Ireland

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I would say charging off the battery directly will be fine with the engine running. Just don't run off any of the internal 12volt sockets (such as the cigarette lighter port)Regards

Fergus
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06-23-2009 01:09 AM  11 years ago
Terrabit

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Seattle, WA - USA

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That's good to know furgus. Thanks!
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06-28-2009 06:33 PM  11 years ago
westcoastchoper

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Denton, Tx

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My 2 chargers say never to run the car while using the battery to charge. Alternators "pulse" when they charge and this can damage your charger. Taken from another website....

"If you use your car battery to charge while at the field. Do not start you car while charging."

I guess they could mean to not start if after chargin has commenced which would drop the voltage.
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06-30-2009 12:21 AM  11 years ago
zaw

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Lebanon, NH - USA

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If I charge from Cig outlet charging 2200 3s at 1C when it reach 12v I'll get voltage error on my charger.

If I clamp directly to battery I don't get the error.

Make sure you bring jumper cables.
ಠ_ಠ HBK2 built with inexpensive parts! ٩๏̯͡๏)۶ Gaui425
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06-30-2009 12:31 AM  11 years ago
Terrabit

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Seattle, WA - USA

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If I tried to charge 10s from a cig lighter, I'd pop a fuse pretty quickly.

Got jumper cables!
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