Battery alarm ?

[Excalibur3]

I have mine set to 3.6v per cell and she buzzes the entire time I fly. For the whole 5 min. When I landed there was still 3.7 per cell. What's up with that?


HK250SR,Blade 450 3D,Blade 450 X,DX6I, Phoenix V4,Nano CPX, ( Newborn baby Trex 500)

[Blayd]

Battery alarm on what? Is this one of those external thingies you put on the heli?
What size batts...
How much is your starting voltage.. ( should be 4.2v off the charger )
What exactly is buzzing?
I use a timer on my Tx....I started out flying a few minutes at a time until I was using up 75% of the batteries mAh. These days, I'm actually only using 73%. 70% in the 12S 700 set up.

[mhills51]

It is possible you have one bad cell or really low cell in your pack

[Excalibur3]

Ok trex 500e. And they are 6s 2650 40c lipos. I charge them to 4.2v per cell. I have one of those battery alarms you plug directly into the balance lead of the battery. So with a fresh charge all cells are balanced and it reads 4.2 per cell. ( I don't have a low cell) then as soon as I spool up bam!!! it starts beeping. So I land and check it and its still plenty of voltage It makes no sense. I've been using these alarms on all my helis and up to now they work perfectly. They are also Programmable. I have mine set to 3.6v per cell. The last flight I flew for a full five min and landed with 3.8 left per cell. This is why it makes no sense to me why it's buzzing the whole time. And yes I double checked the alarm on one of my 450's and it worked perfectly.


HK250SR,Blade 450 3D,Blade 450 X,DX6I, Phoenix V4,Nano CPX, ( Newborn baby Trex 500)

[Excalibur3]

HK250SR,Blade 450 3D,Blade 450 X,DX6I, Phoenix V4,Nano CPX, ( Newborn baby Trex 500)

[mhills51]

Don't know what it could be other than some bad cells. The 500 pulls less amps than a 450 so unless you have a bad motor or something else binding. It looked like a bad battery. A bad cell will sometimes look great when not under load and as soon as the load is gone it will look good again. That tester only test for voltage and not amps.

[Excalibur3]

I don't know then. I can watch it while I fly and it reads each cell 1-6 and tells me the volts for each one. And it's buzzing with the volts all reading higher than 3.6v I'm gonna set it to 3.5 tomorrow and see what happens


HK250SR,Blade 450 3D,Blade 450 X,DX6I, Phoenix V4,Nano CPX, ( Newborn baby Trex 500)

[fastblackbird1]

I have the same battery alarm and does same thing I have to 3.6 and the alarm start after a minute or less I don't fly anymore with it in the heli, I just use to check the volt in the pack before fly and set my transmitter at 5 minutes (it's annoying the sound)

[Excalibur3]

And the Heli flys perfectly. It comes down barely warm. What a pleasure to fly. If anyone out there is reading this and doesn't have a 500. Get one you won't regret it. There is a huge diff between my 450's and the 500. The sound the blades make is unbelievable. I love it.


HK250SR,Blade 450 3D,Blade 450 X,DX6I, Phoenix V4,Nano CPX, ( Newborn baby Trex 500)

[fastblackbird1]

Your battery cell are fine its the ALARM what I thing does comes with defect of the factory, but it read perfect the cell volt cause I check with my charger and it does the same volt what the alarm say. Any way its a good tool for the field

[Excalibur3]

Originally Posted by fastblackbird1

Your battery cell are fine its the ALARM what I thing does comes with defect of the factory, but it read perfect the cell volt cause I check with my charger and it does the same volt what the alarm say. Any way its a good tool for the field

Hey brother I'm not sure what you are saying??? Are you saying its my alarm that might be broken?


HK250SR,Blade 450 3D,Blade 450 X,DX6I, Phoenix V4,Nano CPX, ( Newborn baby Trex 500)

[bstanley72]

If you checked it on a 450 and it was fine then there must be a glitch with the meter on 6s batteries. Forget using the voltage alarm in the bird, fly with a timer instead.

[fastblackbird1]

Not your alarm its not broken its just like mine, mine does same thing like yours since I bought it I keep trying to set at 3.6 but I can't or might I don't know how, I just follow the instructions and it doesn't work.

I tried several times but it does buzzing after a seconds when I plug it.
Just check your time and after fly check the battery volt and then you will know how long you can fly before the battery volt has less than 3.8 per cell.

[fastblackbird1]

And I have 450 and doesn't work in mine, I just use it to check the volt cell before and after fly

[KSHeli]

The heli will pull enough current to pull the voltage to below 3.8 V and it may just be that there is some resistance in your setup, I you have a CC ESC you could pull the log and look at the voltage and current graphs. When batteries get old they will drop voltage during demands on the battery because of internal resistance. Can you get someone to get an IR reading of the individual cells of the battery, all it take is one poor cell.
If I'm just hovering around I'll set the alarm at 3.6-3.7 if I want to end in the 3.8-3.9V range if I'm flying harder I'll need to set down to maybe 3.3-3.4V because of the larger current demands which drops the voltage significantly. I have some older batteries that I use just for warm up and on a newly charged pack if I pickpump one time the alarm will go off at 3.4V.
As others said find the time that each of your styles of flying that give you an ending Voltage of about 3.8V.
Jim

[Excalibur3]

I have a dx6i. And my hearing is fine. But to be honest sometimes I just don't hear the buzzer. I wish there was a way to make it loader.


HK250SR,Blade 450 3D,Blade 450 X,DX6I, Phoenix V4,Nano CPX, ( Newborn baby Trex 500)

[Blayd]

Originally Posted by bstanley72

Forget using the voltage alarm in the bird, fly with a timer instead.

+1

Time your flights to 70-80% of the mAH of the battery and fly that.
Alarms are OK, but if you time your flights, you dont need any more things in the pipe line to go wrong.