Need more runtime out of 4/3AF 6v pack


Newly Enlightened
Mar 26, 2011
I have some blackburn bike lights that only run 1hr on the charge. The pack is a 5 cell 4/3AF 3600mAH. Can I buy some 4200 or 4500 4/3AF cells and make a better battery?
Anyone know why the pack would have red/black/white/blue wires coming out of it? Are they just two sets of +/-? What cells are the best and where do I find them? How hard is it to make a pack? Would the new pack last longer than an hour pushing 2 lights with Cree XM-L W280 leds?