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2.4G Spektrum Radios Spektrum 2.4 Gigahertz Radios and Technology


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Old 12-03-2015, 07:11 AM   #1 (permalink)
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Default DX9 alarm voltage

I have a dx9. Replaced the li-ion battery with a spectrum 4000mah lipo. I changed the battery type in the radio to lipo. What do I want program in for an alarm voltage.
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Old 12-03-2015, 07:43 AM   #2 (permalink)
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I have a dx9. Replaced the li-ion battery with a spectrum 4000mah lipo. I changed the battery type in the radio to lipo. What do I want program in for an alarm voltage.
It should change the default on its own depending on which chemistry is chosen when you changed the programming. If I remember correctly, Lipo and Li ion are the same at around 6.4V default.

That is why there is the requirement to tell the TX which battery type, so it sets the default itself to prevent going below 3-3.2V per cell compared to a Nicad or other type of chemistry which will have a lower threshold.

You can change it if you wish, and some stick to the 3.7V per cell rule like we do for the heli itself, but the default will be fine since TX packs are not under hard loads like the heli packs are
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Old 12-03-2015, 08:53 AM   #3 (permalink)
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Thank you
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Old 12-03-2015, 10:57 AM   #4 (permalink)
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I just did the same to my DX9 but went with a Turnigy 4000mAh pack. I left the low voltage at the default setting.
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Old 12-03-2015, 11:50 AM   #5 (permalink)
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The default setting is best starting point.Perfectly adequate with a new OEM pack. As a pack ages it may fall off faster at lower end of its discharge.I have seen a couple cases with non OEM packs where the voltage cutoff level wasnt quite where it should be.
Its possible it may no longer give as much time between warning and shut off.
It doesnt hurt to bump the alarm voltage up a couple tenths to give a little more margin.The amount of flight time you might lose going to 6.6 instead of 6.4 is hardly worth noting. Below 6.8-7 volts they are done pretty fast anyway.
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Old 12-04-2015, 11:24 PM   #6 (permalink)
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OK. I suppose 7.0 would be a safe warning voltage. Would that be correct.
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Old 12-05-2015, 12:28 AM   #7 (permalink)
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Thats raising it from the default 6.4 alot. A couple tenths is more than adequate for a bit more buffer. I would use 6.6
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