Question About Wiring and LED drivers

I'm planning on making a 5x SSC P7, 2 cree r4 light. I want to power it with two macbook pro batteries. I want to use this driver to power the 5 p7s: http://www.taskled.com/hipcc.html
I want to power the r4s with this driver: http://www.dealextreme.com/details.dx/sku.26110
However the macbook pro batteries each put out 10.8 volts and I need to wire them in series to power the p7s, so 21.8 volts. But the dx cree r4 driver says it can only be used up to 18 volts, would it be ok to use this?
I could use this: http://www.ledsupply.com/03023-d-e-1000.php, but its expensive.
This is one idea, oops the 18 volt driver's red wire should be connected to the plus.


Would this work?

From the HipCC website:

5 li-ion cells MAX.

You have it connected across the two 10.8V MBP batteries, which I believe they are each a 3s configuration. So you would end up with 6s connected to the HipCC.

If those battery packs were fully charged, you would read 25V across the HipCC driver, a bit over its maximum rating.

Also, please make sure each driver (and the LEDs they are driving) are on separate isolated electrical planes, otherwise you could end up with some funky things going on.

I'm also a bit worried you may exceed the battery pack's maximum output power rating? 5x 10W P7s + 2x 5W Crees = 60W. Factor in driver inefficiencies and you're looking at close to around the same level as what a MBP draws when it's running full-tilt.

Hmmm, but the load will be spread over 2 batteries, so wait, can i use the mbp batteries to power the hipcc. Also, what is a separate isolated electrical plane?

I think you'll get more answers in electronics and batteries section. You should ask the mods to move it for you. :thumbsup:

Moderators, could you move this to the electronics and batteries section