TEST: "eGo-C Upgrade" Multimeter Test

[jlew]

I Love this battery!

I recently got one of these from a Black Friday Sale and decided to test it... I have
already been using it for 3 days so I mean "test" it

The Battery takes 7 seconds to switch modes and I have yet to see a 3.3V "Constant".

Fully Charged (just came off the charger 1.5 to 2 hours ago).

Silver "eGo-C Upgrade" 900mah

Tested using a modified Center Post from a Vision "Stardust" and Digital Multimeter

Modified Center Post Test Connector:
1) Removed the post from a Vision Clearomizer (non-replaceable head)
2) Removed the rubber tip and wick
3) Pushed out the center pin from inside the tubing
4) Pushed out the rubber center pin gasket
5) The hole through the top of the center pin is slightly smaller than the multimeter
probe -- Drilled the hole to accommodate a multimeter probe.
6) Cut the flanges from the top of the post tubing (where the wick would rest between)
7) Sanded the top of the tubing and replaced the gasket and center pin

To Use:
Screw the modified post to the a battery, place the Positive Probe in the center, and
touch the Negative Probe to the outer tubing. Set the Multimeter to 20V DC and press
the battery button.


Note: Inset Photo - "White" Button Color. This should be in "Constant 3.3V" Mode
Voltage is showing 4.09V


Note: Inset Photo - "Orange/Yellow" Button Color. This should be in "High Voltage" Mode
Voltage is showing 4.17V

4.17V would be considered "High Voltage" Mode if the standard mode were showing 3.3V Constant.

Testing with a second multimeter -- a Professional RSR Tech Multimeter:


"Constant Mode" shows 4.13V


"High Voltage" Mode shows 4.21V

Either way, the "Constant Mode" is not constant at 3.3V but the "High Voltage" Mode is correct.

There is only one other possibility as to why the "Constant" is not at 3.3V and that would be
because there is no "resistance" when using a multimeter in this manner - in other words,
No Resistance Wire/Coil - therefore, it very well may be 3.3V when tested using a 2.4ohm
resistor on the the Positive probe.

This is the only "eGo-C Upgrade" battery I own so I cannot say that this is the same for all of
these batteries but it is something that may need checked into by other owners.

I also have an "eGo-C" 650mah and a 400mah and they both test out at 3.7V and 3.71V using
the same methods and fully charged.

 

[Switched]

eGo C requires a load as the 3.3V is under load.

 

[jlew]

Thanks - That is what I figured --

There is only one other possibility as to why the "Constant" is not at 3.3V and that would be
because there is no "resistance" when using a multimeter in this manner - in other words,
No Resistance Wire/Coil - therefore, it very well may be 3.3V when tested using a 2.4ohm
resistor on the the Positive probe.

So... I need to figure out what Resistor will work. I know that I can get just about any size resistor
but what wattage is needed is another matter.

Can someone tell me what watt size is necessary or if the wattage is of no matter, so long as the
resistor is the proper ohm rating (e.g., 2.0ohm to 2.4ohm)...

Thanks again.

P.S. If nothing else, I may just look into building one of the Voltage Testers used to connect the battery
right to the meter.

 

[WillyB]

A 10W power resistor would a good choice. They have the cement types (big and clunky) or the fancier wirewounds (round).