Hey folks. I have the DX2S DSM 2-Ch Transmitter w/Receiver and for some reason it is not accurately displaying the battery voltage. I am using two 2s lipos (total 4s). When I turn on the dx2s, it shows RX Batt: 5.8V with both batteries fully charged. Correct me if I'm wrong but a fully charged 2s lipo is 4.2V and since I am using two, that would make it 8.4V. Shouldn't I be seeing RX Batt: 8.4V? Please help!

Telemetry will only monitor the bec output voltage (not useful for electric cars)

In a nitro car it will monitor the RX battery pack

To monitor your lipo pack voltage you need additional parts

Cheers

this article lists out the additional parts crusey_aus mentioned:
http://www.horizonhobby.com/Articles...ArticleID=1882

Nice Post !!!!!!!!! thanks for useful information according.....I think its great articles in this thread,,,,,well done,,,,,,,,,,,,

Just a little FYI, a fully charged lipo has 4.2V per cell. So a 2S lipo would have 8.4V.....not sure if you're running parallel for more runtime or in series for voltage.

you are right. I noticed that I meant to say 8.4v regarding my 2s lipos. And going back to my original post, since im running two 2s lipos, i should be seeing 16.8v on my screen.

macavant
What car is the steering wheel in your avatar from.
The company I work for supplies a lot of push button switches for F1, ALMS, Datana Prototypes and the kill switches for NASCAR.
Bob Oaks

you're only going to see the 5.8V coming from the ESC.. not the battery voltage from your lipos...now if you connect your 2x2s lipos to your RX.. you will not see a 16.8V on your screen but would see smoke from your RX...

the 16.8V is the input voltage to your ESC... your ESC limits the voltage output going to your RX to 6V(in your case, 5.8V)...this is what your RX is measuring and is displaying...spektrum RX has an input voltage range from 3.8V to 9V...

i use DX3S in my TC5. i can read the temp/RPM of motor and voltage of LIPO at a time.
Please check the max input of voltage to SR3300T not over 9.6V!!
The LIPO as photo is not fully charged, so display only 6.4V.

that's cool! these "steering wheels" are more interfaces nowadays
the avatar is the wheel from the RedBull RB5 aka "kate's dirty sister".

If you have your ESC connected to your reciever then you are not monitoring battery voltage

The voltage you see on the screen is the bec circuit from the ESC, and it will not change regardless of your main pack voltage

As mentioned earlier in the thread, to monitor the actual pack voltage requires addittional components

Cheers

Of course, my receiver is connected to & powered by LIPO directly (not as you expected powered by ESC). And the voltage display on TX is LIPO's battery, not BEC of ESC !!
I connect the BEC power to my servo.
This is the same concept of 1cell 1/12 car using extra pack of battery for receiver & servo.

For the hobby shop & RC manufacturers, it is ture for them to told the customer to buy additional components...But if my receiver (SR3300T) already have such abilitiy, why i need to pay. Also, the additional components cost me a lot, in items of money, space/weight in my RC car.....

then you have a different set up compared to the OP....his RX is definitely powered by the ESC...and he is measuring the ESC BEC out...

yes, your understanding is correct.
more photos of my tx's reading....