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HelicopterAerial Photography and Video › ? about charging
12-01-2005 06:54 PM  12 years agoPost 1
Brett Horton

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What is the general consensus about Rcx and Trx battery packs in between several day small shoots?
ie. I might fly today for 15 minutes doing a shoot and then two days go by before I fly again.
My question is do most out there top of there batteries after each day no matter how short of a flight it is or do you let the capacity dwindle down somewhat before charging?

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12-01-2005 07:12 PM  12 years agoPost 2
aschuck

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Las Vegas

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It depends on what kind of batteries your using.

Alex

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12-01-2005 07:14 PM  12 years agoPost 3
Brett Horton

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Sorry,
NiMH

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12-01-2005 07:31 PM  12 years agoPost 4
aschuck

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Las Vegas

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NiMHs are pretty good for shelf life.
NiCds are the worst.
Lipos are the best.
It depends on their capacity. If you trust yourself on guessing how much you’ve used verses how much is left. Charging them at the beginning of the day or at the end of the day should be ok if you do a slow charge (500ma) just to be sure.

Alex

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12-01-2005 07:43 PM  12 years agoPost 5
Load Factor

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Colleyville, Texas

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I charge mine the night before any shoot. NiMH, LP, Li Ion,.....etc.

I like them at full capacity regardless. With all the packs we use it can be very time consuming........but worth it!

Tanner

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12-01-2005 08:51 PM  12 years agoPost 6
Brett Horton

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I also typically charge before each day, but was just wondering what every one else is doing, thanks for the replys guys.

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12-01-2005 08:58 PM  12 years agoPost 7
GauchoVolador

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Tx

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There is still the fight between those who believe that Nimhs are not good for RX use since its discharging characteristics and overdraining under higher loads such as mutiple high torque digital servos.... Still didnt dare using Nimhs while working.

but you know.. every teacher has its own book as we say here.


I cycle Nicds at least one time before recharging no matter how long I used it.

Have anyone of you had any issue with nimhs?

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12-01-2005 09:10 PM  12 years agoPost 8
TCGliderguy

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Albuquerque, New Mexico

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>overdraining under higher loads such as mutiple high torque digital servos<

I wouldn't worry about NiMh batteries under "high" current loads. I hang around with a bunch of RABID F5J electric powered sailplane nuts.... and they are regularly pulling close to 100 AMPS out of 7 cell NiMh packs. They actually deliberately overcharge the packs to heat them up, because they put out more power when they are warm. Now admittedly, they only run their motors in 20 second bursts..... but you get the idea. A bunch of big servos won't pull anywhere near as much power as one honkin' brushless sailplane motor.

-TC

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12-01-2005 10:42 PM  12 years agoPost 9
daggit

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Claremont, MN

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I run a single 4000mah NICAD rx battery. It gets charged each day before missions begin. I can comfortably run 6 average missions on one charge if they are run the same day. I do not charge after a days work because the Nicad can loose 200-300mah or more just sitting on the bench for a couple days.

I went away from Nimhs in the beginning because I once had one "false-peak" on the charger causing me to lose control of my Raptor after a 3 minute flight. I later learned that I didn't condition the Nihm properly when I first got it. I still use that Nihm for my pan/tilt 3 years later.

I'm just more confident with big Nicads on the rx.

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12-02-2005 12:06 AM  12 years agoPost 10
Brett Horton

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I run dual NiMH's also, and have been using them in my gassers for about 3 years with no trouble (so far).
I remember hearing why NOT to use NiMH in gassers because of the vibration aspects. Any thruth to this?
Once again I have had no troube with four gassers in over 3 years of fairly heavy flying (maybe 600 flights through the years?)
See Ya'll

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12-02-2005 12:32 PM  12 years agoPost 11
Helicek

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istanbul - turkey

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On the subject,
I use a 12V 2Ah pb on the 18,5 kgm FlyingCam to power 12V downlink and the camera platform (5V w/regulator). This 12V gets an overnight charge every job. A 5000 D size 4.8V RX NiCad pack also used which get a charge before every job and at least one top up charge during the job.

On Benzin Trainer HeliCam we have 4.8V1800mah SC for rx and 12V300mah for for downlink and 5V(w/regulator) for camera platform.
All NiCads get a proper charge night before each job. These batteries get at least one top up charge during the job.

The transmitters are (2) GraupnerMC24s for HeliCams and JR8103 for Camera control. MC24's come w/3000 NiMh's and 8103 have 2100 NiMh. I slow charge transmitter NiMh batteries night before and I don't have to worry about TX batteries on the job.

On all NiCads and NiMhs I record mah readings of each charge. I know more or less how much I have flown the HeliCams and I have a rough idea of the charge that is going to be needed. If I see an unusual charge value on a particular pack then I take a closer look at it.

I know NiMhs should be charged once everyday and SC NiCads can take charge repeatedly.
I do several charge/discharge cycles on a new NiMh and NiCad pack to assure it delivers accordingly.

Wow, that is long answer. I hope it gets read!
Cheers,
Ahmet

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12-02-2005 01:14 PM  12 years agoPost 12
HUTCH964

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Taylor,Texas 76574 local airport T74

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Duralite 4000 packs

I have been flying the Duralite 4000 W/5.1 reg. for almost a year now and never had a problem with them... I fly my gasser for a week before I recharge granted it is no more than 5 flights I will sometimes recharge them when I know I will be flying more than normal..


*****

Tim

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12-02-2005 10:05 PM  12 years agoPost 13
Invertedflyby

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TX

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I use a 2700mah Nimh and charge it with my JR Walwart charger at night between flights. I think the charger puts out 70mah. I've flown several tanks through in a day and have yet to run it down.

I'm wondering if the rap that Nimhs got from being 'overloaded' by digital servos was from people doing hard 3d. AP doesn't work the servos like 3d.

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12-02-2005 10:07 PM  12 years agoPost 14
Brett Horton

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I agree but digital servos "work" harder to maintain neutral.
But I run all digitals on my birds as well.

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12-03-2005 03:36 AM  12 years agoPost 15
tech1

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Mississauga

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I have been running 1500 Mah Nimh batteries for 2 seasons now and no problems.

They are fast charges after every day of flying and if it has been a few days I will slow charge overnight before a new mission.

I do the fast charge and keep a record of how much power was put back into the battery vs how many flights. If the battery begins to cycle differently or gives odd readings when peaking I will know something is up.

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12-06-2005 11:50 PM  12 years agoPost 16
DANNO

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St. Petersburg, Florida

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5 cells or 4

anyone using 5 cells for the rx? the leads from my battery through the switch harness is so long, that even a charged back shows yellow lights on the voltwatch when moving all the servos at once.....

www.skypiximaging.com

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12-07-2005 04:35 AM  12 years agoPost 17
markrwalker007

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Invercargill New Zealand

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I also heard about nimh bats discharging quickley in cold weather my cell phone has one and always stays charged longer in my pocket thats why I use a nicad 2400 pack we have cold weather

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12-07-2005 01:37 PM  12 years agoPost 18
FCM

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Surrey, England

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I'm using 5 x 4000 mha NiMh cells that are apparently used to power notebook computers. I run the pack through a Duralite switch/regulator without any problems.

I have tried the quick charge GP3600 mah Panasonic cells but they do not last very long as they are not 'pushed' enough with Rx use. They gradually lose their capacity.

The cells I am using now are holding up well although I normally cycle every charge if I get the chance. I charge them as NiCads as it does not seem to harm them and you do not get false peaks.

I changed to 5 cells with regulator when I was shown by my local model shop owner just how much my digital servos dropped the voltage on a 4 cell pack when put under some load. It was scary seeing the voltage drop off on my GV1 read-out with minimal loading on the heli's swashplate. I left the shop with a regulator and made up my first 5 cell pack the very next day!

Try it - you may be surprised at the voltage you see just by pressing down on your heli's swashplate with a fully charged 4 cell pack. You will need to have digital servos though as normal coreless do not have the high start-up current draw of digitals.

Paul.

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12-08-2005 03:11 PM  12 years agoPost 19
DANNO

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St. Petersburg, Florida

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what about just using a 5 cell pack with no regulator? my rx says 4 or 5 cell pack, and recomends 5 cells if your using lots of powerfull servos.....

www.skypiximaging.com

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12-08-2005 03:14 PM  12 years agoPost 20
electro212

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Lancaster Pa

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danno

your gyro will hate you

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HelicopterAerial Photography and Video › ? about charging
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