2W SAIK SA-305 26650 Host W/Massive Mohrenberg Heatsink

Seraphim202 said:

Hey DTR i have a big problem,
I set both flexdrive at ca. 900mA if i measure the input i get on the first flexdrive 0,92A on the other 0,94A all right.
But if i put the flexdrives together i get an input of only 0,80A and the beam is not so bright as it is with one flexdrive.

I use 32600 akkus 4000mAh 3V from ultrafire. And yes my wirering is all right. :undecided: Could it be that the akku does not supply enough power.

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First off you mean you are measuring the output on the driver not the input? You will need a test load to do this.

Also if you read the description on those batteries they say "Low Discharge rate" UltraFire BRC 32600 4000mAh 3.0V li-ion battery(2-Pack)

That is a big red flag to me. I would guess you are having your current limited from the battery. Plus the current draw from the flex will be higher on these because of the lower voltage. 3.6V fully charged instead of 4.2V fully charged. If that battery can only handle a 1A current draw that is probably why it is brighter with just one driver. Get one of these.

http://kaidomain.com/ProductDetails.aspx?ProductID=2708

Thanks for your answer.
I will try it with the new batterie.