ROP Voltage Problems

[mikra]

Hi,
I recently build my first ROP, I use 6 eneloops to Power it.

Under Load the Voltage goes down to 5.5V, so the Bulb is underdriven.
Is there a way to get more juice out of the eneloops?

 

[Sgt. LED]

Have you done any resistance mods to the switch or fixed the tailspring yet?

This will help.

 

[mikra]

No, but i measured the voltage at the battery holder (fivemega charging plug).

 

[jahxman]

Maybe you have a bad cell? Did you check each one?

How are you loading the pack when you check it - what resistor?

I'll check mine later but if I remember right the six eneloops in my fivemega holder don't sag so much under load, I'll try a test later.

 

[mikra]

I did not check the individual cells under load, I try to do that.
I was checking the Voltage in the light (ROP High ~1.4 Ohm).

 

[mikra]

I just tested the individual cells with a 0.4 ohm load, they all go down to ~1.0 V.

 

[lctorana]

I blame your charger.

 

[fivemega]

Hi,
I recently build my first ROP, I use 6 eneloops to Power it.

Under Load the Voltage goes down to 5.5V, so the Bulb is underdriven.
Is there a way to get more juice out of the eneloops?

What is the voltage without load?
Make sure batteries are installed correctly, fully recharge them and recheck voltage without load and then under load.

 

[mikra]

I found the Problem .

The wire I used to "replace" the tailcap during the measurements had a high resistance, and I measured the voltage on the wrong side of the wire.

 

[mikra]

Ok, I measured the Voltage again, this time I used my Leatherman instead of the wire.

The eneloops go down to 7.10 V under load, I think that's OK.