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HelicopterMain Discussion › TX battery charge ?
05-07-2005 12:17 AM  12 years agoPost 1
arceye

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UK

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Hi

Using the charge socket that is built into a JR transmitter does anyone have any idea what the maximum charge rate that can be used without causing any damage to the transmitter circuit board?

The reason I ask is that a fellow pilot at the club was charging his TX battery using the built in socket and a field charger, using a charge rate of 600mA. I never questioned it in any way at the time but when I got home I started to think about if it could cause any damamge to the transmitter in any way.


I do charge my TX battery at the field at a high rate but I always remove it from the transmitter first.

Also does anyone know anything about the performance and reliability of the high speed GWS S19CLMG tail servo ? the specs show it to be 0.10 sec/60 degree and about 6Kg/cm at 4.8 V, from what I can find it has a corless motor, dual bearings and metal gears but I have not heard of anyone who has used 1 or found any information on any forums about how good or bad they are.

Thx in advance


Andy


Kasama Head :(
The Blingiest DOWNGRADE a Raptor can have

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05-07-2005 12:40 AM  12 years agoPost 2
Al Magaloff

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Andy, I would think again about fast charging a transmitter battery, at those rates. Your buddy will be buying a new battery soon.

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05-07-2005 01:34 AM  12 years agoPost 3
arceye

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UK

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I would have thought the battery itself would be ok at a rate of 600mA as that is 1C, which seems to be generally acceptable for charging all nicads.

What I was concerned about is the possible damage to his transmitter circuit board when he is pushing 600mA through it to charge while the battery is still installed.

My battery as I said, I do charge my TX pack at the field at high rate if it starts to get a little low, but it is a 1800mAh pack and is only charged outside of the transmitter also at a rate of 600mA but that is only 1/3C and prety harmless to the pack.


Kasama Head :(
The Blingiest DOWNGRADE a Raptor can have

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05-07-2005 02:00 AM  12 years agoPost 4
Sealerman

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Long Island, New York.

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What I was concerned about is the possible damage to his transmitter circuit board when he is pushing 600mA through it to charge while the battery is still installed.
I've never had a problem and there is no warning about it in the manual.
I do charge my TX pack at the field at high rate if it starts to get a little low, but it is a 1800mAh
Dam, an 1800mAh pack should last a few days without needing to be charged at the field.

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05-07-2005 03:07 AM  12 years agoPost 5
Phranque

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an 1800mAh pack should last a few days without needing to be charged at the field.
No doubt. I picked up a 2100mah from Radical for my 9C, and that will literally last an entire weekend, plus some.
If you are needing to top off an 1800mah at the field, you are either one flying maniac, or you need to think about replacing that battery.

Flying a heli is like seeing the Matrix, it is a mind bending experience.

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05-07-2005 09:48 AM  12 years agoPost 6
nivlek

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Norfolk England

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It depends on the diode in the charge circuit . It is probably at least a 1A diode , so 600mA wouldn't be a problem .

At the end of the day , it gets dark .

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05-07-2005 11:27 AM  12 years agoPost 7
Al Magaloff

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Yup, charge until you smell plastic melting. Have a spare transmitter battery ready. C10 is all you need. If you have to fast charge your transmitter, I would take a second look at your methodology.

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05-07-2005 12:39 PM  12 years agoPost 8
Ace Dude

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USA

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C10 is all you need.
Do not use C10! Perhaps you mean C/10.

Any lets be realistic here folks, the Sirius Pro which is probably one of the most popular chargers in use today and it is a fixed rate charger. It charges the TX at about 550Mah. The Sirius Pro Plus charges at 1.1A. If this was a problem there would be a lot more problems posted on these forums and warnings about using this charger. Yes, I have and use Sirius Pro Plus.

It's always best to check with the manufacturer, but in general it's safe to charge up to 1-1.5A. Some folks say it's safe up to 2A, but personally I wouldn't go over 2A.

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05-07-2005 01:36 PM  12 years agoPost 9
Drunk Monk

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Preston, UK

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My JR had a 600ma pack in it and is usually down to 9.7V after 5 or 6 flights so I quick charge it at 1A at the field with no probs. I've built a 1800ma pack since then and that can generally last a whole weekend without needing to be charged.


Stephen

I only open my mouth to change feet.....

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05-07-2005 03:16 PM  12 years agoPost 10
Al Magaloff

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Yup C/10. If I we Andy, I'd check to see what the actual battery capacity is.

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05-07-2005 09:07 PM  12 years agoPost 11
heligoole

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yorkshire,uk

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i have charged 2300mah 8cell nimh in my transmitter at 2.3amps...other than it getting quite warm..no other damage...i normally charge at 1amp..fast charge or overnight 70ma(15hrs or so)it is advisable to not charge too quickly..as battery life is shortened....once in a while ,say at a fly in or comp its ok to fast charge for obvious reasons...try not to go over 1 amp as a general rule

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05-07-2005 09:27 PM  12 years agoPost 12
frensh-hélis

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france, sud , near Nimes (gard )

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Hi,
i give you my opinon , if you charge tx/rx battery quicly you dont have lot of time to use models or radio !!
more the time of charge is bigger , more is the time to use battery . CDNI and NIMH battery give you good perform ( juste for your radio tx and rx ) if your "charge mode" is slow charge.

for propultion battery is not the same . generaly battery give you big perform in short time if you charge it with a big currant.

if you want big time to use battery , you must charge it with a short currant

that my expérience

Olivier ( and sorry for my english )

frensh pilot in 3d helis

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05-07-2005 09:28 PM  12 years agoPost 13
frensh-hélis

rrNovice

france, sud , near Nimes (gard )

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Hi,
i give you my opinon , if you charge tx/rx battery quicly you dont have lot of time to use models or radio !!
more the time of charge is bigger , more is the time to use battery. CDNI and NIMH battery give you good perform ( juste for you radio tx and rx ) if your "charge mode" is slow charge.

for propultion battery is not the same . generaly battery give you big perform in short time if you charge it with a big currant.

if you want big time to use battery , you must charge it with a short currant

that my expérience

Olivier ( and sorry for my english )

frensh pilot in 3d helis

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05-07-2005 09:42 PM  12 years agoPost 14
heligoole

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yorkshire,uk

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your right olivier,this is because the internal resistance of the battery/flight pack changes when hot(fast charge)...i forget the exact theory something like emf=current xresistance(V=I x R),when at temperature constant.....ie when not at constant...all goes variable..

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05-07-2005 09:49 PM  12 years agoPost 15
frensh-hélis

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france, sud , near Nimes (gard )

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thanks heligoole for your help

but it's verry difficult for me to explane for someone in english

Olivier

frensh pilot in 3d helis

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05-08-2005 12:01 AM  12 years agoPost 16
nivlek

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Norfolk England

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but it's verry difficult for me to explane for someone in english
Don't worry , we knew what you were saying . If I tried to explain something in French , that would be the time to be confused .

At the end of the day , it gets dark .

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05-08-2005 02:10 AM  12 years agoPost 17
arceye

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UK

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Some nice replies I gues my buddy isn't going to kill his TX then.

To add reason to me chargine my tx pack at the field this is basically because sometimes I am at the field flying for the entire day and I mean tank after tank, it isn't unusual for me to have the transmitter on for 5 hours or more which explains why I need to recharge even the 1800mAh pack.

Yep I do agree under normal usage of the average weekend I would never even have to consider recharging the TX pack.

thanks for the help I was juts a little worried about my buddy possibly causing damage to his transmitter by charging to fast through with the battery still installed.


But I guess nobody knows anything about the servo I mentioned ?


Kasama Head :(
The Blingiest DOWNGRADE a Raptor can have

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