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Battery Question!

Old 12-26-2008, 07:35 AM
  #1  
jakestg
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Exclamation Battery Question!

Hey,

I got a 8.4V 1000mAh battery for my Hobbyzone Supercub RC Electric plane. I dislike sitting for 2 hours while it charges in the wall (AC). I tried DC in the car it worked great till the car battery died cause the car must be on for it to charge. I was thinking about getting a 12v DC Powersupply

http://www.hobby-lobby.com/powersupply.htm

Here it is... But.. I have no clue how to use it and how to plug it up and what I need... Please will you guys give me some help So I can charge my batteries .
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Old 12-26-2008, 07:59 AM
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This might be hard to explain without pictures but here goes...
You need to decide how you want to hook up the charger in the future. Such as do you want to still be able to use it at the field or just at home with the power supply? this will determine how you will do the hookup. The power supply you are looking at uses banana plugs to supply power. If you want to keep the charger as it is, and it has the cigarette lighter plug on it (you said IN the car) you can get an adapter (female lighter socket with wires that come off it) and add banana plugs to it. Or if the charger has alligator clips for hookup, you can mount posts on a piece of Plexiglas, or any nonconducting material, wired to some banana plugs. You would then clamp the alligator clips to the posts which would be powered from the power supply.
Or, if you plan on just using your charger at home or always having the power supply available, you could just cut off what ever connector is on the charger and add, (you guessed it!) banana plugs and just plug it directly into your power supply. Keep in mind that you will have to pay close attention to polarity, so make sure you can tell which wire is positive and which is negative. Most electronics don't like it too much when you reverse them!
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Old 12-26-2008, 08:03 AM
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Twmaster
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Gary has pretty much covered what you need to do. I would like to add that I own one of the 20A power supplies you linked to at Hobby Lobby. It is a good unit that you will be happy with. Also, they have a 20% off thing going on right now. That makes those power supplies a super value.

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Old 12-26-2008, 09:25 AM
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I think you guys missed the point.
The chargers that come with most RTFs are slow chargers - ie they provide a low level of charging current thats 'safe' for the battery.
In order to get a quick charge time (quick can be from 15 minutes and up) one needs to buy a more expensive smart charger. These types of chargers have special sensing circuits that cut off the charge when the battery is fully charged. This allows the charging current to be set higher without the worry of ruining a battery pack.
BUT not only do you need the special charger you also need a source of 12V DC (or higher) since most of these special cargers do not plug into a wall socket.
Do a search of these forums and see what chargers people are recommending and also buy a power supply to go with the charger.
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Old 12-26-2008, 09:36 AM
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The car charger supplied with that plane is much faster than the wall charger that also comes with the plane.

Even if he buys a good charger chances are he's still going to need a good 12VDC PSU.
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Old 12-26-2008, 04:10 PM
  #6  
cyclops2
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Default You need a new car battery.

Hi Jake.

There is NO WAY you can run down a AVERAGE car battery in 1 day with a a 1000 mahr battery.

Buy or get a better car battery. A hi power amplifier playing while you fly MAY cause the dead battery.

The RC battery & charger ARE NOT the cause of a dead car battery.

Rich
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Old 12-26-2008, 04:58 PM
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Like Mike, I too have that very same unit. You will be very pleased with it. It obviously takes banana plugs, but something I didn't know until I got the unit was that those plug jacks uncrew some, and expose the interior posts that you can (CAREFULLY!) attach alligator clips to. How sweet!

It's an awesome power supply. You won't be disappointed.
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Old 12-26-2008, 06:50 PM
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They are called 'binding posts' They unscrew so you can wrap bare wire around them and then tighten to hold the wire in place. Also. if you unscrew the lug fairly far you should see a hole that passes crossways through the post. It is big enough for you to insert a wire or the test probe from a multi-meter into it. You then just tighten the lug to hold it in place.

Neat and versatile stuff.
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Old 12-26-2008, 07:11 PM
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That is nice! I didn't realize this supply was equipped with binding posts...that makes everything much easier!
Hopefully Jake is already flying since we never heard back from him!
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Old 12-26-2008, 09:32 PM
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jakestg
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ok I plugged it into my moms car twice to recharge and her battery was dead! its because everything in the car was turned on by the key so it can charge.. The car must be turned on in order for the battery to be charged.
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Old 12-26-2008, 09:40 PM
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Ahh...the light dawns! Try and see if the lighter will power up when you turn the key backwards (acc position). Usually it will, and that way won't turn the ignition components on, which is likely why the battery died. The ignition system can draw quite a bit of current not to mention you can damage compnents by just letting it sit without the engine running.
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Old 12-26-2008, 09:42 PM
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hmm I will try that! But my moms BF is brining over this work station thingy that plugs into the inside house wall (AC) and it has a DC outlet or the ciggerette thingy..
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Old 12-26-2008, 09:45 PM
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Ok I got into my moms car and turned the key once forward there is no back all I saw was the radio came on thats it and the DC phone charger lit up.. I think thats what I should of kept it at.. Now I cant charge it cause my mom thinks I dont know what im doing lol.
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Old 12-26-2008, 09:46 PM
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In just about every car I ever saw the cigarette lighter socket is hot all the time. (as in not switched on by key)
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Old 12-26-2008, 09:49 PM
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Mine is switched in my truck ('08 2500 ram), but I have a power socket that is always hot...
I have also come across a few cars that have lighters that are switched on with the key, but they almost always will come on in the ACC position.
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Old 12-26-2008, 09:51 PM
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Originally Posted by jakestg View Post
hmm I will try that! But my moms BF is brining over this work station thingy that plugs into the inside house wall (AC) and it has a DC outlet or the ciggerette thingy..
That should work just as well as the power supply and much better than killing your mom's car batt!
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Old 12-26-2008, 09:53 PM
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Originally Posted by jakestg View Post
Ok I got into my moms car and turned the key once forward there is no back all I saw was the radio came on thats it and the DC phone charger lit up.. I think thats what I should of kept it at.. Now I cant charge it cause my mom thinks I dont know what im doing lol.
Sorry about that...I should have mentioned that usually newer cars the ACC position is one click forward...
old habits and all... lol
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Old 12-26-2008, 09:54 PM
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jakestg
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Yeah Its like a CD player type of thing and it has a Ciggerette DC input I hope it works ><.
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Old 12-26-2008, 09:57 PM
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Sounds like a Bosch work radio...If it is, that should be fine. I believe it has enough amperage to power your charger with no trouble.
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Old 12-26-2008, 10:06 PM
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jakestg
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Yeah I remember him saying somehting about a work radio and where u can drop it with a CD in it and it wont skip lol.. The thing that confuses me is like.. Why cant they come out with AC chargers that can charge a Battery as fast as a Car Charge can?? How will a work radio like change it all?
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Old 12-27-2008, 03:58 AM
  #21  
Bill G
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Exclamation Saw the exclamation point and.....

thought it must be a lipo fire or something like that.
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