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HomeRC & PowerAircraftHelicopterRadio - Futaba FASST › 2.4GHz newbie question - rx battery life
04-01-2009 03:55 PM  9 years agoPost 1
AlabamaRaptor

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Millbrook

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I just switched to 2.4GHz and I am using a stock 1500mah rx battery pack. My question is will I get the same flight time as I did before when I was on 72MHz? The only thing that changed was the rx; the servos stayed the same. Just asking because I don't want to get a low voltage reset with a 50-sized helicopter (wouldn't be pretty) because I have been told that the 2.4GHz system is more sensitive to low voltage than my previous 72MHz system.

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04-01-2009 04:06 PM  9 years agoPost 2
Quandumphone

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Yuma, AZ

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You are probably fine but what you should do is find the specs for the receiver voltage. It will be listed in minimum and maximum. For obvious reasons, make sure the battery you use is capable of exceeding this minimum voltage under load for as long as you plan to run it and with some buffer after that.

You don't want to go below mimimun to avoid the shut down scenario. As receivers use more digital electrinics, they are also susceptible to stopping if the voltage is too low. Stay near or below the maximum to avoid undue wear and tear but don't worry too much if the fresh charge takes you a bit over max. When the battery runs down with a load, it will normally be close enough or below the max for normal operation.

I would feel totally comfortable flying with a 5 cell NiCd if that's what you are using. Probably not as comfortable with a 4 cell battery. Watch the charge as you fly for the day, 1500mah is a bit on the low side if you fly a lot.

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04-01-2009 04:39 PM  9 years agoPost 3
AlabamaRaptor

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Millbrook

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Thanks.

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04-01-2009 06:28 PM  9 years agoPost 4
Zaneman007

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Texas - USA

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I am using a stock 1500mah rx battery pack
What type of battery? My concern would be that the spectrum 2.4ghz Rx "resets" if the "momentarily" voltage drops to low! A voltage spike, could spell trouble. This is seen mostly with 4.8 volt systems.

If you are running a spectrum (or JR) Rx , I'd go to the spectrum web site, and read up on the issue.

Old Guys Rule!

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04-16-2009 08:59 PM  9 years agoPost 5
AlabamaRaptor

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Millbrook

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Sony 1500mah 4.8v battery

It's there a device called "Voltage Watch" that has a few LED's to see the batteries voltage level?

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04-19-2009 09:57 AM  9 years agoPost 6
JetFire

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The Golden STATE

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If your worried about Rx battery life, I would recommend that you convert to a more reliable LiPo setup with a regulator of some sort like the Align 2in1 v2. It has a built in glow ignitor and battery indicator and is not that expensive. There is nothing wrong of having a setup similar to yours now, but I'm telling ya... its worth every penny and you'll never look back.


Trex700N Pro
DX8-2.4
Spartan/BL9088

-The ONLY way you fail is when you quit.-

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04-23-2009 08:27 PM  9 years agoPost 7
AlabamaRaptor

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Millbrook

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I upgraded to a 4.8 volt 2700 mAh from www.batteriesamerica.com

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04-23-2009 09:37 PM  9 years agoPost 8
ferincr

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From Argentina now in Costa Rica

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I upgraded to a 4.8 volt 2700 mAh
I couldn't find it on the link you posted, but if you are talking about the 2700mah AA size cells I've been told long time ago that it wasn't a good choice for Rx packs since they have a pretty high internal resistance and if you are running digital or high current demanding servos the batt wouldn't be able to deliver enough current.
Make sure they are ok before you fly them. I ended up making Tx packs with mine since I had like 20 of these cells

Intelligence chases me, but I'm a lot faster! Fernando

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04-24-2009 02:06 AM  9 years agoPost 9
Thomas L Erb

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Alliance ohio

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Hi All! I have always used a 4.8 batteries because i like to use the KISS principle. I have never had an issue. But if you are running all digital servos you will really want to use a sub C cell pack. the AA size may not give you the desired amperage depending on your servo setup. the sub C will work fine and i have seen them as high as 5400mah. or go to a regulated system. hope this helps
Tom

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04-24-2009 01:21 PM  9 years agoPost 10
AlabamaRaptor

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Millbrook

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Thanks. I will check them.

Just scroll down a few inches and you will see
RECEIVER BATTERY SALE:
4.8v and 6v

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04-25-2009 09:13 PM  9 years agoPost 11
tasmanian devil

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DeSoto,Tx.

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The servos are your main power drain.The Rx is'nt going to make much difference on the Rx pack.

I do'nt crash,I just rearrange parts.

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