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12-11-2004 06:51 PM  13 years agoPost 1
Aaron29

rrProfessor

USA

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12-11-2004 06:57 PM  13 years agoPost 2
BarracudaHockey

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Jacksonville FL

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Yes and absolutely.

Andy
AMA 77227
http://www.jaxrc.com

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12-11-2004 07:00 PM  13 years agoPost 3
Crusty

rrApprentice

N51 degrees 29.823 minutes W3 degrees 16.133 minut

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I have seen this once in a pack and it carried on to give service, I put it down to pack just needing a bit of exercise so to speak.
Give it another cycle or two and if it holds at 1000 or so I would personally trust it, but it is a decision you have to make

I am dsylexia of borg..resistance is fruity...your arse will be laminated

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12-11-2004 07:03 PM  13 years agoPost 4
Aaron29

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USA

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12-11-2004 08:58 PM  13 years agoPost 5
vhorton

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Huntsville,AL

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your battery maybe ok, but I cycle every two months and if the battery falls less than 20% of the total mAh, its time to start looking at replaceing the pack. ex. (1100mAh discharged and recharge to 880mAh) start looking for a new pack.
....and by doing this I have only replaced battery packs every two or three years.

Big "V"

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12-11-2004 09:34 PM  13 years agoPost 6
Aaron29

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USA

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12-12-2004 05:03 AM  13 years agoPost 7
reckless loony

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MIA

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http://www.runryder.com/helicopter/t142342p1

well its good you confirmed the cause. The most important thing you can do is to check the battery or batteries (in your case) prior to every flight either with an on board battery checker or an external battery checker. The checker would have shown the abnormal battery voltage decay over subsequent flights.

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12-12-2004 02:51 PM  13 years agoPost 8
Aaron29

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12-12-2004 06:27 PM  13 years agoPost 9
reckless loony

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MIA

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Is that the GEM 2000? If so that has but one LED which gives a go no go indication only.

A lot of those flying heli’s here use on board battery checkers like this

http://www.atsrcplanes.com/batteryind.htm

I myself am currently using one of these

http://www.hobbypeople.net/gallery/759836.asp

Your Rx switch on the heli has three leads. One goes to battery, one to Rx and the other is the charging lead, which connects, directly to the battery when the switch is in the off position.

The way I do things is to have the battery fully charged prior to going to the field. Once there I have everything setup, place the frequency tag into the board, wipe the Tx aerial clean, etc I then perform a range check. I leave the Rx switch on I plug the power mate 2 into the charging lead wiggle the sticks on the Tx just in order to place an extra load on the battery and flick the Rx switch to off immediately the power mate gives a reading. Incidentally the power mate places a ½ amp load on the battery.

After a flight I leave the Rx switch on till I am in the pits plug the power mate into the charging lead wiggle the sticks on the Tx just for that extra load on the battery flick the Rx switch off and note the power mate meter reading.

With a meter either LED or ESV you get trend indication. For e.g. after my first flight the meter always shows above 90% if however it was to show say 60% then straight away I know that something is sus. Either a cell is weak in the battery pack or some abnormal current drain has taken place during the flight such as a binding servo.

BTW I do cycle my Nicd battery packs as well as do regular capacity checks. I also have a field charger so to top up the battery as required.

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12-13-2004 09:01 AM  13 years agoPost 10
Yuma_Tommy

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Yuma, Arizona -- USA

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Battery Recycle
Aaron

I recycle every other month just to make sure my packs are in ggod shape. Keep your charge/discharge rate on the low side and you will be fine. Recycling won't hurt ypur packs and will give you heads up to any problems.

Raptor 50 V2--Evo 50--Freya X-Spec--Airtronics Stylus

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12-13-2004 05:48 PM  13 years agoPost 11
gigi

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Port-au-Prince, Haiti

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Computing mAh with voltmeter and stopwatch?
I've got a Futaba BC2000 Battery checker / discharger. I use it to discharge my batteries to prevent memory-related problems.

Exactly how would I go about computing the capacity of a battery? Assuming a 1,000 mAH battery, fully charged, and being discharged at 1 amp. If it lasts 1 hour, I take it the battery is fine. Can I interpolate on that, meaning if it lasts 80% of 1 hour, it's got 80% of the capacity?

Gigi

My heli spending has gone way down since I got a Honda 919 :-)

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12-27-2004 06:32 PM  13 years agoPost 12
reckless loony

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MIA

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Assuming a 1,000 mAH battery, fully charged, and being discharged at 1 amp. If it lasts 1 hour, I take it the battery is fine. Can I interpolate on that, meaning if it lasts 80% of 1 hour, it's got 80% of the capacity?
Yes.

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12-27-2004 07:37 PM  13 years agoPost 13
BarracudaHockey

rrMaster

Jacksonville FL

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A note on battery checks. Its best to perform battery checks immediately post flight. After sitting for a while, the packs voltage can come back up and you won't be getting a accurate idea of whats going on in flight. This of course doesn't preclude you from performing a check prior to the first flight of the day.

The best way is to get a ESV with a load test button, there you get the voltage under load that say your gyro will see while the servo's are moving etc.

Andy

Andy
AMA 77227
http://www.jaxrc.com

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12-28-2004 04:29 AM  13 years agoPost 14
gigi

rrVeteran

Port-au-Prince, Haiti

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Thanks!
Good info

Gigi

My heli spending has gone way down since I got a Honda 919 :-)

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