Joule Thief

[jeanna]

The test is now on its way to find out how much energy is inside a fully charged 2000mAh AA NiMH battery. 

Thank you, Paul.
I have been wanting to know that.
If you can figure out a speed test too, I think that will add even more for us.

I have one camera that gives the alarm after 5 pix of one brand battery, and another that uses that same AA for 20 pix and a few full cards .
I also have 3 battery operated things that decidedly prefer the ray o vac to the energizer even though the energizer might have more mA rating.
I know with alc's that the speed of draw changes the life of the battery. It seems this is also true with the NiMH's where some do the fast draw better than others.
So a definitive test on this would be great.

thank you,

jeanna

[PaulLowrance]

Is this with a Joule thief or just a battery ?

No JT. Just a battery connected to a resistor.

Jeanna, next time I'll try a faster drain. The load for this test is 10 ohms.

Does anyone know the lowest voltage a NiMH can be taken down to without harming it?

Paul

[innovation_station]

just got the last cridder built all done and ready to play with ..

here is a picture of the finished coil

ist!

[crowclaw]

No JT. Just a battery connected to a resistor.

Jeanna, next time I'll try a faster drain. The load for this test is 10 ohms.

Does anyone know the lowest voltage a NiMH can be taken down to without harming it?

Paul

Hi paul'
Under loaded conditions, Fully charged = 1.2 volts and discharged = 1 volt.
NiMH batteries should be charged @ constant current.

[gadgetmall]

Paul i let mine a few run dead to 0.5 and i hav a few aaa ni/mh i let run dead dead to 0.19 .. dead is 0.19 .they still run oscillators down to that voltage and charge fine on an 18 hour charger .. almost every time i did this they acharge to a bit higher voltagethat they started with . I have also charged them with a bedini in an 8 pack and they get warm and last a long time .I have yet in years seen a ni/mh short like nicads do . and if they do a jolt from a bedini will bring them back . If yousee one with 0.00 its shorted