Advice on Battery needed please

[dme25]

Hi all just need some advice re what battery to use on this set up (3xp7 leds, Dewitchel driver), need about 2 - 3hrs run time

http://daoriginal.da.funpic.de//data...0Converter.pdf



Here's the Batt i was thinking of will this do the job.

http://cgi.ebay.co.uk/18-5v-4000mAh-...item23091d0ba4



i'm using 0.75 wire all around, on Momentary switch, p7's and to the host is that ok.



Thanks for any advice regards Dave