NIMH WITH 9252'S ??

[OHIOBOWHUNTER]

ANYONE RUNNING NIMH BATTERY'S WITH 9252 DIGITAL'S ? THE SERVO PACKAGE SAYS NICAD ONLY , BUT THE SHOP WHO SOLD ME MY STUFF RECOMENDED THE NIMH PACK :arggg: :dontknow

[Gunner]

I'm running 9252s everywhere except the rudder and am using a 3300 NiMH battery. Been running this way for almost a year. I'm not having any problems at all.

[ClayK]

I ran NiMH and NiCD with 3151's and then 9252's. Both will work but you need to pay special attention to load testing before every flight. It's a very real danger and something that needs to be paid attention to.

I only run regulated Duralite systems since my last battery failsafe. I haven't had a problem since.

[DavidH]

DO NOT USE the 2700 mah nimh A size cells. Unless you charge the pack after every flight. These cells can not supply the demand of all digital servos for more than 1 flight. You need at least sub C size cells in both nimh and nicad to supply the demand needed.

David

[dogg5306]

Not correct !!!
I've been flying for more than 9 months using a 2700mah NiMH pack (A Sanyo cells) on my Raptor 50 that is equipped with 2 9252 and 2 9451 + GY611+9256+GV1... not a single battery issue... 3 to 4 flights per session!

One piece of advice, do cycle them before going to the field...

[DavidH]

Your luckier than me and several others. I had the receiver go into battery failsafe with the 2700 mah packs. I could duplicate it and make if go into battery failsafe. It would always do it on the second flight after coming off charge.

David

[RobRoy]

I've been flying with 2700 NiMH (A cells) on my raptor 50's with a full load of 9252's on cycle, GY601/9251 and 9254 on throttle for two years now, yes I have to charge every 3 to 4 flights, but have not had any problems. I do load test before every flight, and charge anytime it drops below 4.8v with a 1.5amp load. I like the size/weight of this pack for a 50 size bird.

[ClayK]

Your luckier than me and several others. I had the receiver go into battery failsafe with the 2700 mah packs. I could duplicate it and make if go into battery failsafe. It would always do it on the second flight after coming off charge.

David

Same happened to me, that's why I now fly a regulated system.

In addition, flight performance changes on that third or fourth flight. Servos aren't quite as snappy. Regulated system, it's the same response whether it's the first flight or the 8th.

[BarracudaHockey]

Well the NiCad only warning originated in the days of the first generation NiMH cells that had high internal resistence and the voltage dropped off under load. Make sure you use quality cells of a decent capacity and load test before flight. Clays right though, regulated lithium's are the way to go.

[OHIOBOWHUNTER]

lithium's ? isn't the're min. voltage something like 7.4 ? how do you make that work for a 4.8 system ?
p.s. pardon my ignorance i'm just stepping back into r/c after a 15 yr hiatus...back then it was pretty much just nicad's :noteworthy

[DavidH]

You use a voltage regulator. I have been using voltage regulators since around 1995. Sure it nice to fly with the same voltage all the time from the first flight till the 10 or 11th flight on the same charge.
Voltage regulators come in 5.1, 5.3, 5.6, or 6 Volts.

David

[OHIOBOWHUNTER]

thanks dave...i would like to look into this more indepth but have no clue where to start at ...any suggestions ??? thanks all :noteworthy

[ClayK]

Duralite Batteries (http://www.duralitebatteries.com)
Fromeco (http://www.fromeco.org)

[OHIOBOWHUNTER]

r/c heli mag. has an article this month on electrics but i think its more geared toward motors and not receiver battery packs, I'm really lost here, when i got out of r/c in the late 80's all you had to do was plug your nicad pack into rec. pretty much a no brainer !!! i cant believe how far technology has effected this hobbie :WOW

[ClayK]

I've noticed a difference between my NiMH/NiCD flights and my LiON flights about the third flight. The major difference was in servo response and not having to charge. Normally, on a third tank I was swapping out batteries and setting up the used one for a charge. Now, I just carry my fuel bag out to the line and fly as long as I feel like. I do a load check prior to flight, but unless it's the 10th flight, there is no reason to swap out my LiON pack.

When someone first told me about running a regulated system, I looked at the cost and shivered. After my first crash due to battery fail, I realized the cost was justified. My loss was due to a receiver failsafe from battery dropoff. Some fellow pilots this weekend experienced a gyro reset/initialize due to low battery. Needless to say, I think they are going to regulated systems as well.

Now a days, the gyros are faster/better, the receivers are faster/better, servos are faster/stronger, batteries better, auto-pilots exist, etc etc. Our little hobby is definitely growing. Good times, good times.