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Discussion Starter #1
Hi All.

I'm days away from trading my 11 Santa Fe for a 13 Sonata Hybrid. One of the things I use my Santa Fe for is my radio control hobby. I fly mostly helicopters and some airplanes. Everything these days is electric using lithium polymer batteries that require a LOT of current to charge. With a normal car you can charge 3 or 4 times but more than that and you risk needing a jump start. Some people have generators to charge the hobby batteries but that is a pain.

I did a search and some reading and it seems to me (so far) that this car has a conventional 12 lead battery and the lithium hybrid battery but if you drain the 12 volt too far will the car's hybrid battery dump some power quickly to recharge the 12 volt battery and start the ICE? Will it drain from both while off with a hobby charger attached to the 12v battery?

Should I just keep using the generator or will this car be slick and allow me to pull of both batteries for half a day and still get me home? I'm losing a lot of cargo room compared to the Santa Fe and bringing the generator will be even more of a hassle now.

Thanks!
 

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The hybrid battery will not charge the 12V battery by itself. When you hit the start button to listen to the radio without starting the ICE we get a warning that this will drain the 12V battery. I have had to jump start our car 3 times. The car will not start when the 12V battery gets below 10.5V.
 

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Discussion Starter #3
Okay, thanks.

In my search I found one mention of a "ready" mode where the ICE will start itself when the battery gets too low in the scenario we're talking about? I can't remember the details of that post. They might have been talking about an older one or even a different brand.
 

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Technically speaking, if you actually "Start" the car, then the alternator should work to keep the battery charged. I think the scenario that Tom mentioned above would be if you kept the vehicle in Accessory mode instead of starting it as though you were going to take it for a drive.

Once started, the ICE will turn on and off as needed.

I will caution though, using the battery in this way will likely cause it to have a much shortened life.
 

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How about a power inverter? You can attach it to the car battery and start the car when you need to charge your other batteries.
 

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Glenn, keep me updated if you do try to charge your rc battery with the HSH.

I have Traxxas Rustler with lipo batteries and am hesitant to charge them in the field with my HSH.
 

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Why not just bring another 12V battery along, rather than a generator? It wouldn't be too hard to connect the extra battery in the trunk to the main battery with a disconnect switch (which would allow it stayed charged up just the like regular battery). Just disconnect the auxillary battery from the car when you're using it for the RC stuff and then you don't have to worry about depleting the car's battery. After you start your car back up, you could return the disconnect switch to the connected position and let the alternator charge both batteries back up. Wouldn't be any different than jump starting a car with a dead battery.
I think some boats use the same thing. That way you can use one battery for lights and stuff onboard without worry there won't be enough charge left to start the engine and motor back home.
 

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That's what I was thinking. Just get a small 12V Deep Cycle Boat battery and charge it at home. A good one costs about $150.
 
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