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HelicopterMain Discussion › is my rx battery going bad already??
01-27-2007 09:56 PM  10 years agoPost 1
danielhv

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Little Rock, AR

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I charged it for like, 24 hours, checked it with the Futaba batt checker, and it doesnt go all the way to the top on the digital scale.... I flew two tanks today, and now its in the yellow.... Ive only had it for maybe 4 months.

Raptor 30v2 (OS37 SZ-H)
Blade 450 3D
Spektrum DX8

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01-27-2007 10:06 PM  10 years agoPost 2
vavavoom

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London, England

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What type of charger and what MAh pack?
If you are using the normal wall charger that has a 70MAh output, in 24 hours it will put out 1570MAh in theory.
If your pack is larger than this then its probably not being charged fully.
Eg a 2400 pack will take over 36 hours to fully charge allowing for a little margin of error.

## Inteligence is knowing a tomato is a fruit...Common sense is not putting it in a fruit salad

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01-27-2007 10:07 PM  10 years agoPost 3
frankg11

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Bellevue, WA

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we need a bit more information please.

For example,

What is the battery chemistry?
What size is the batter in Mah?
How old is the battery?
What Servos are your running?

For example if the battery something like at 1500Mah Nicad that is 5 years old, go get a new battery that is at least 2400Mah or bigger.

Thank you for the additional information.

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01-27-2007 10:08 PM  10 years agoPost 4
danielhv

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Little Rock, AR

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its an 1100Mah Nicad. And yes, im using the wall charger that came with the tx. Its only 4 months old, and has less than 20 flights on it.... Im using DS821 servos.

Raptor 30v2 (OS37 SZ-H)
Blade 450 3D
Spektrum DX8

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01-27-2007 10:12 PM  10 years agoPost 5
vavavoom

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Should be ok with that charger then. It may have built up a memory effect. To get rid of this you need to fully charge and discharge the pack five times.( down to about 0.9-1v per cell)
Without being very technical,what happens is the capacity in effect gets reduced by top up charging when the pack is flat.
Nicads are pretty bad for this, but it can be sorted out by the method above.
You may want to up the pack MAh however as in my opinion you dont want to go lower than about a 1700 on an R50

## Inteligence is knowing a tomato is a fruit...Common sense is not putting it in a fruit salad

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01-27-2007 10:27 PM  10 years agoPost 6
Reidar Otto

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Drøbak Norway

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Batterycare....

If you really want your batterypacks to last, and to be trusted, you should get a good charger or two.
One for the workshop, should be able to charge and discharge, and if you put in a little more money, should have a program for cycling 3 to 5 times.
In your fieldbox you should have a little charger that could top up your TX and RX batteries while you refuel your heli.
In my workshop I use a Schulze 6-330, and in the fieldbox I have a Sirius Charge Pro, an amazing little charger that cures your packs for memory trouble and keep them fresh for a long time. Higly recommended!
http://www.siriuselectronics.com/in...&products_id=10

regards
Reidar Otto

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01-27-2007 11:04 PM  10 years agoPost 7
danielhv

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Little Rock, AR

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I have a triton charger, but I dont use it for my tx/rx... should I? Is the triton a good charger? How do I use it instead and set it up correctly? Do I just cut the ends off the wall charger and solder them into the banana plugs on the triton?

Raptor 30v2 (OS37 SZ-H)
Blade 450 3D
Spektrum DX8

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01-27-2007 11:18 PM  10 years agoPost 8
Reidar Otto

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I had a look at the manual ,found it here:
http://www.electrifly.com/manuals/g...manual-v1_1.pdf
and it seems like the Triton will do the job nicly for both Tx and RX packs. It can be programmed to up to 10 cycles.
Just be a bit careful and set the charge/discharge rate low for the TX, I think max 1A then you should be safe. And since your RX pack was 1100 mAH, 1A charge/discharge would be ok for that one too.
You could easily cut the ends off the wallcharger, or just buy a readymade chargecable from your hobbystore.
What kind of TX are you using?
regards
Reidar Otto
ps: I would still recommend a Sirius charger in your fieldbox, you could ofcourse use it at home too!

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01-27-2007 11:22 PM  10 years agoPost 9
danielhv

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Little Rock, AR

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JR 7202... Will it take less time to charge the two as it does with the wall charger? How long does it take to charge the rx batt from scratch? This cycling, is it going to take a few days of non stop charging/discharging?

Raptor 30v2 (OS37 SZ-H)
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01-27-2007 11:55 PM  10 years agoPost 10
Reidar Otto

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Drøbak Norway

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Using the Triton or a Sirius charger it would only take about an hour to charge an empty pack, but since your packs almost never is completely empty it would normally take less than an hour.......

The cycling will use around two hours for one charge/discharge round, you should probably use 5 cycles now since you never done it before, and then 3 cycles every 3-5 month, and everytime you have stored your packs without using them for a while.

It is a very cheap insurance, you only have to program your charger and wait. But your packs will last much longer and will carry much more energy, ie be safer to use!

regards
Reidar Otto

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01-27-2007 11:59 PM  10 years agoPost 11
Reidar Otto

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Drøbak Norway

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Charging the TX.
I am using a JR3810(JR8301) and had to shorten a diode in the TX to be able to use a automatic charger. I guess you will have to do the same, or you could just remove the batterypack from the TX when charging.
Removing or shorten the diode is not too hard if you can use a soldering iron. If you can´t maybe you cold ask a friend or the guys at your local hobbystore?

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01-28-2007 12:45 AM  10 years agoPost 12
danielhv

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Little Rock, AR

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Charging the TX.
I am using a JR3810(JR8301) and had to shorten a diode in the TX to be able to use a automatic charger. I guess you will have to do the same, or you could just remove the batterypack from the TX when charging.
Removing or shorten the diode is not too hard if you can use a soldering iron. If you can´t maybe you cold ask a friend or the guys at your local hobbystore?
Is there a website or something showing how to do this? Also, where do I solder the signal wire (orange wire) coming from the wall charger?

Raptor 30v2 (OS37 SZ-H)
Blade 450 3D
Spektrum DX8

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01-28-2007 02:26 AM  10 years agoPost 13
C30

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Cookeville Tn USA

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checked it with the Futaba batt checker, and it doesnt go all the way to the top on the digital scale
Are you using the futaba br2000 ? If so did you make sure the voltage selector on the side was in the right position ?

Chuck

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01-28-2007 02:37 AM  10 years agoPost 14
danielhv

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Little Rock, AR

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Are you using the futaba br2000 ? If so did you make sure the voltage selector on the side was in the right position ?
Yes, and yes.

Raptor 30v2 (OS37 SZ-H)
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01-28-2007 02:51 AM  10 years agoPost 15
C30

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Cookeville Tn USA

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Yes, and yes.
So much for my theory... I've had the switch in the wrong positon before...the voltage displays correctly but the graph will be wrong.

Chuck

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01-28-2007 03:07 AM  10 years agoPost 16
danielhv

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Little Rock, AR

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right now ive got the triton cycling the batt.... do I have it charge and discharge at 1.0A or just set it to auto and let it do its own thing?

Raptor 30v2 (OS37 SZ-H)
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Spektrum DX8

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01-28-2007 06:54 PM  10 years agoPost 17
Reidar Otto

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Drøbak Norway

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You could use AUTO mode, but the manual suggest that you put in charge/discharge values manually, have a look at page 9, qoute:

"Auto-Mode:If pre-set charge currents are not entered in the menu before attempting to charge a battery, Triton's circuitry will automatically set the appropriate charge current to match the battery. Once the battery is connected and the charge process has been started, Triton will monitor and evaluate the condition of the battery and automatically set a charge current. Because the effectiveness of the auto-mode is dependent on many variables relative to the battery being charged (how much charge currently exists, age and quality of the cells, quality of the charge leads, etc.), Triton will likely produce better results when programmed manually. This, and learning how to specifically care for your batteries will ultimately lead to better performance.
Because of their small size (which is directly proportional to their high internal impedance and natural tendency to overheat easily), it is recommended NOT to use the auto-mode for charging small park-flyer type batteries (cells smaller than "AA" ). Using the auto-mode for NiCds with a rated capacity of 600-2400mAh, or NiMHs with a rated capacity of 1000-3000mAh is acceptable."

regards
Reidar Otto

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01-28-2007 06:56 PM  10 years agoPost 18
Reidar Otto

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Drøbak Norway

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For charging you do not need the orange signalwire, just cut it.
RO

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01-29-2007 02:18 AM  10 years agoPost 19
frankg11

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Bellevue, WA

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How come no one has mentioned a single flight on a rappy 50 will consume about 300 - 400 mah per flight. He has a 1100Mha pack. That makes it good for 2 flights.

We mostly fly with a minimum of a 2400 mah pack which is good for about 4 or 5 flights.

If you want to fly all day, get a 4800 Lipo and regulator. But in most cases a 2400 Mah back will allow you to fly more without recharging.

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01-29-2007 11:48 AM  10 years agoPost 20
Reidar Otto

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Drøbak Norway

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A very valid point, frankg11

I also use a 2400mAh pack on my Rap50, and a few JR 1800 mAh packs on a Cal30 and a Shuttle30. A 1100 mAh pack is on the small side......

Bu I always, and I do mean ALWAYS, top up the RX battery with my Sirius charger between flights. I just connect it to the charger, then do the refuelling. And I have never run out of power for the RX.
For more than 10 years. It is very cheap insurance!!
The Sirus Charger Pro cost around $140, street price is lower, it is very rugged build, will last forever and packs more energy into batterypacks than any other charger I own. And no, I dont know the people behind the company, I do not own any stocks in the company, I paid full price plus postage to Norway and then 24% VAT, so it cost me a lot of money, but it is just a too good charger to miss.

just my 2 cents...

regards
Reidar Otto

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HelicopterMain Discussion › is my rx battery going bad already??
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