SSC P4 - how many cells?

How many Li-Ion C cells does it take to run a 7 emitter set up for SSCP4?

Hey, sorry to trash your question, :ironic: but you really need to give more details when you ask things like that. Such as how high power you want to run them, and what run-time you want.

AW's C cells = 3.7V nominal 3.3Ah, max 5A discharge.
Watts = Amps * Volts
Allowed W discharge= 5*3.7 = 18.5W

SSC emitters vary between 2.8V and 3.7V at different current drive.
I will assume that you want to drive them .35A (the company-recommended drive), or 1A (Recommended max).

7 emitters = 3.25V*.35A*7 (Then divide by .85 to overcompensate for driver inefficiency) = 9.4W = only one battery

@ 1A = 30.5W = 2 batteries.

If you wire the LEDs in series, you will probably need at least half of the working voltage of the series, as I don't know of a boost driver which goes over 2*Vin (This doesn't mean to say there isn't one, I'm not big on driver knowledge). That would mean for both configurations you would be stuck with 4 batteries needed.

You can work out the runtime by converting the battery to Watt Hours (it's 12.2Wh, but that decreases the higher the current you discharge it at)
and then figuring out how many watts your application is.
divide the Wh by the W and you are left with h (hours) runtime.

-Xiorcal