5-cell, 6 volt battery, what kind of charger is needed?  
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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> 5-cell, 6 volt battery, what kind of charger is needed?
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5-cell, 6 volt battery, what kind of charger is needed? - 4/27/2004 2:23:45 AM   
KingSalomon



Posts: 165
Joined: 1/1/2004
From: FAIRMONT, MN, USA
Status: offline 		With a 5-cell, 6 volt battery, what charger is needed? both NiMh and NiCd? Can I use a Wall charger? (I will be using a Futaba 7C, and Hitec 475HB servos (6 of them). Thanks! -Dan

P.S. its for a UCD 3D .46


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Dan Fordice
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RE: 5-cell, 6 volt battery, what kind of charger is nee... - 4/27/2004 4:16:51 AM   
ezflyr



Posts: 264
Joined: 2/9/2002
From: Tewksbury, MA, USA
Status: offline 		Hi,

No, the wall wart charger supplied with your radio will almost certainly not work for a 6V pack. These chargers are almost universally for the 4 cell 4.8V packs and will not work for the 5 cell 6.0V packs. You'll need to get a charger like the Triton or Alpha 4 (and many others) that allow you to specify the number of cells being charged. These chargers adjust their output charge voltages accordingly to match the type of pack (4.8V or 6.0V) you are charging.

John

(in reply to KingSalomon)
       Post #: 2

RE: 5-cell, 6 volt battery, what kind of charger is nee... - 4/27/2004 4:51:06 AM   
FHHuber



Posts: 4931
Joined: 1/1/2003
From: gone, , USA
Status: offline 		Match the charger to the pack you intend to charge.

Given a week... the wall-wart MIGHT charge the 5 cell pack. But it would be a bad idea to try it.

For the U-Can-Do .46, even powered with a strong .61 or a .72 4-stoke (more power than it will ever NEED) The servos you plan to use will have plenty of power with the standard 4 cell pack... You may gain a bit of control response speed... but most people won't be able see the difference.

MY advice is... fly it using the 4 cell pack. It will fly decently with a strong .46... and will get up and dance with a strong .61.

(in reply to ezflyr)
       Post #: 3

RE: 5-cell, 6 volt battery, what kind of charger is nee... - 4/27/2004 3:03:24 PM   
ezflyr



Posts: 264
Joined: 2/9/2002
From: Tewksbury, MA, USA
Status: offline
quote:

Given a week... the wall-wart MIGHT charge the 5 cell pack. But it would be a bad idea to try it.


Frankly, this is bad advice! If the output voltage of the charger is setup for a 4.8V pack, the 6.0V pack will never charge. I think you are confusing the 4.8V/6.0V issue with the battery capacity issue. A wall wart charger will charge a higher capacity pack than the original, but the pack voltage must still be the same.

John

(in reply to FHHuber)
       Post #: 4

RE: 5-cell, 6 volt battery, what kind of charger is nee... - 4/27/2004 6:02:50 PM   
JoeAirPort



Posts: 6933
Joined: 8/11/2003
From: Milwaukee, WI, USA
Status: offline 		I had this same question a few months ago and was told by credible forumers that it does work. An 1100mah NiMh, 6 V battery charged great on my Futaba stock 4.8V, 100 ma output charger. I added about 4 hours due to the voltage change and another 2 to form it the first time. I do this all the time guys, it charges it right up to the peak voltage of 6.9 volts just like my 6V field charger. And I tested it LOADED to 300ma.

Do they work for everyone? Not sure. But it worked for me. If I have time I always overnight charge my 6V 1100mah battery packs on my Futaba charger. But keep in mind that my charger has a 100ma output. If you use a 50ma output it could take 20-40 hours depending on your battery size. Mine takes 16 hours to reach peak capacity. It's always slightly warm to touch when I take it off the charger after 16 hours.

< Message edited by JoeAirPort -- 4/27/2004 12:05:22 PM >

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Joe AP

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RE: 5-cell, 6 volt battery, what kind of charger is nee... - 4/27/2004 6:35:11 PM   
ezflyr



Posts: 264
Joined: 2/9/2002
From: Tewksbury, MA, USA
Status: offline 		Joe,

It may work as you describe, but I think you are also confusing the voltage issue and the capacity issue. They are definitely separate and distinct prolems/issues. If the 4.8V wall wart does indeed charge the 6.0V pack it is because the output voltage of the wall wart is unregulated and is of sufficient magnitude to charge the 6.0V pack. This may or may not always be the case, so I wouldn't rely on it as a reliable battery charge method in the general sense. Even if the voltage of the 4.8V wall wart is high enough to charge the 6.0V pack, the charge current will not be an "optimal" value in terms of charge time, and possibly battery longevity. IMHO, proper battery chargers are cheap, so why mess around with a battery charge method that is not intended for a particular application??

John

(in reply to JoeAirPort)
       Post #: 6

RE: 5-cell, 6 volt battery, what kind of charger is nee... - 4/27/2004 9:24:39 PM   
JoeAirPort



Posts: 6933
Joined: 8/11/2003
From: Milwaukee, WI, USA
Status: offline
quote:

ORIGINAL: ezflyr

why mess around with a battery charge method that is not intended for a particular application??

John



Like my first post says, it works for me but it may not work for you. Do as you wish.

< Message edited by JoeAirPort -- 4/27/2004 4:59:30 PM >

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Joe AP

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RE: 5-cell, 6 volt battery, what kind of charger is nee... - 4/27/2004 11:33:08 PM   
FHHuber



Posts: 4931
Joined: 1/1/2003
From: gone, , USA
Status: offline
quote:

ORIGINAL: ezflyr

quote:

Given a week... the wall-wart MIGHT charge the 5 cell pack. But it would be a bad idea to try it.


Frankly, this is bad advice! If the output voltage of the charger is setup for a 4.8V pack, the 6.0V pack will never charge. I think you are confusing the 4.8V/6.0V issue with the battery capacity issue. A wall wart charger will charge a higher capacity pack than the original, but the pack voltage must still be the same.

John


Bad advice to say its a bad idea to try it?

Did you even read what I wrote? You say not to do it... which is the whole point of what I wrote.

*********
The new Futaba 100 mah charger is a different device thn the 50 mah that ships with every other Futaba radio... Never had one, so I've never read its ratings or done any testing on it. The 50 mah charger is definitely not up to doing 5 cell RX packs.

(in reply to ezflyr)
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RE: 5-cell, 6 volt battery, what kind of charger is nee... - 4/28/2004 1:46:33 AM   
BSC


 

Posts: 46
Joined: 5/29/2002
From: Elmhurst, IL,
Status: offline 		It depends on the battery. You can use a wall charger (I'm assuming you're talking about a charger that comes with your radio) for NiMh or NiCd as long as it outputs the correct amount of current for the battery. The correct amount of current for the battery depends on the capacity of the cells you are using. Take the capacity of the cells (ex 600mah) and divide that by 10. That is the charge current you want to shoot for with a wall charger. If your wall charger is designed for 4.8 volt batteries (it should say on it) then it will probably deliver around 80% of it's rated current to a 6 volt battery. So if it is a 50 ma charger designed for a 4.8v battery, it will probably deliver around 40ma to a 6 volt battery. This would be perfect for a 400mah 6 volt battery. As you can see, that's not a very large battery. If you have a large capacity 6 volt battery, then you will probably want to get a new charger. You can either get a slow charger with a higher current rate, or a fast charger that cuts itself off when the battery is full.

quote:

ORIGINAL: KingSalomon

With a 5-cell, 6 volt battery, what charger is needed? both NiMh and NiCd? Can I use a Wall charger? (I will be using a Futaba 7C, and Hitec 475HB servos (6 of them). Thanks! -Dan

P.S. its for a UCD 3D .46

(in reply to KingSalomon)
       Post #: 9

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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> 5-cell, 6 volt battery, what kind of charger is needed?
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