Malkoff Maglite Drop-In Question?

[:)>]

What happens with a Malkoff 4 to 6 D-Cell drop in is put into a 3 D-cell light? Does the current draw drop and the runtime increase?

I liked what I saw in Big Waffles Malkoff 2 D-cell runtime graphs and I am hoping that I can see the same thing but longer by putting a 4 to 6 D-Cell drop in into a 3 D-Cell light.

What do you know?

 

[Turbo Guy]

Runtime listed as 8 Hrs. on 4 D cells. If you use 3 cells available voltage will be less so it will use more amps. and full out runtime will be reduced. Fact is with 3 cells it may never provide full output.

Example: Say 3 watts is needed for full output.

4cells at 1.5V=6 V . 3 watts /6V=.5A (500 mA)
3 cells at 1.5=4.5 . 3watts/4.5V = .66 amps. (666 mA)

If 3.5 volts min. is required for full out put then 4C only need to be at .875 volts each but 3 cells would have to be at 1.16 volts each.

 

[Bullzeyebill]

4-6D drop-in uses a buck type constant current regulator. Three D's may allow it to run regulated for a short time, then dimming. 2D's would just be too undervoltage. Just not an effecient way to use the 4-6D drop-in. 2-4D drop-in uses a boost circuit, and is useful at 1-5.5 volts or so, and has enough voltage with 2D's for circuit to boost voltage to vf, to run circuit in regulation, though it is more efficient when running 3D cells or so.

Bill

 

[divine]

I wonder how long the 6D would run with 2 D li-on cells in it.

I think 2 D li-on cells would hold 50% more energy than 6 NiMh D cells.

I could be wrong. :thinking:

 

[:)>]

4-6D drop-in uses a buck type constant current regulator. Three D's may allow it to run regulated for a short time, then dimming. 2D's would just be too undervoltage. Just not an effecient way to use the 4-6D drop-in. 2-4D drop-in uses a boost circuit, and is useful at 1-5.5 volts or so, and has enough voltage with 2D's for circuit to boost voltage to vf, to run circuit in regulation, though it is more efficient when running 3D cells or so.

Bill

I am less concerned with the regulation and more concerned with the runtime. Would this damage the Malkoff in any way? Also, it is likely to be less bright and dimming, but how much runtime could I expect to get from it?

Do you think that it would be as bright as the 2D Malkoff but for longer?

 

[:)>]

Runtime listed as 8 Hrs. on 4 D cells. If you use 3 cells available voltage will be less so it will use more amps. and full out runtime will be reduced. Fact is with 3 cells it may never provide full output.

Example: Say 3 watts is needed for full output.

4cells at 1.5V=6 V . 3 watts /6V=.5A (500 mA)
3 cells at 1.5=4.5 . 3watts/4.5V = .66 amps. (666 mA)

If 3.5 volts min. is required for full out put then 4C only need to be at .875 volts each but 3 cells would have to be at 1.16 volts each.

Turbo Guy,

Nice Avatar!