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Available versions for 4,8 V (4 Ni cells)   6 V (5 Ni cells) and 7,4 V (2S LiPo cells)

Two modes of display for the measured voltage.
A. Dot (One moving LED at a time)
B. Bar (All LED's up to the measured voltage)




 

 
EXPANDED SCALE VOLTMETER  

The Expanded Scale Voltmeter is a device which measures the battery's voltage near it's high end thus helping you determine if you can continue using your NiCd pack.
For a 4 cell NiCd/NiMh battery pack the voltage after charging is over and with no load connected should be around 5.00 - 5.50 V.
One should use the pack until it's voltage reaches 4.60 or 4.50 V in order to avoid rapid voltage drop which most certainly occurs below these voltage values.
It is common knowledge to radio control modelers that once the airborne battery pack drops to 4.50 V region they must stop using it and that it must be recharged.
The ESV helps you determine the state of your 4.8V pack having a voltage measurement region of 4.55V to 5.00 V.
Plug it into the battery pack connector and watch the LED's.
There are 4 green ,3 yellow and 3 red LED's.
The first green LED is on when the measured voltage is 5.00 V or more , the second lights at 4.95 V and so on until the last red LED which lights at 4.55 V.
Below 4.55 V no LED is on.
If you press the blue button you get the above indications but under a moderate current load of 0.4A.
You will notice that under load the pack's voltage drops a little (one or two LED's) which is normal if the pack has been used for a flight or two.
This should not happen for a freshly charged and unused pack.
In case you notice this then it is time to label the pack as old or useless.
The ESV has reverse polarity protection so don’t worry about connecting it either way to the battery pack, simply it will not work so change over the connector.
So in conclusion when you have green LED's even if you press the blue button you continue to use the pack with no worry until you see yellow LED's which suggest that you use the pack with caution and finally when you see the red LED's then you must stop using it as it needs charging.

Also there are ESV's for 5 cell (6 V) battery packs and 2S LiPo (7,4 V) which work in a similar manner with the above described 4,8 V ESV but with differences in voltage thresholds.

 

 

     
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