A 12V stick pack of RC2400 from overlander weight 585g

A 12v pack of the 2600SCU cells in the same configuration from overlander weighs 610g.

Not that you probably would, but dony buy them in stick packs as they are covered in 2 layers of heat shrink (one round each stick and one around the pack as a whole) which gives very poor cooling potential, and the cells are normally attahced via spot welded tags which have a much much higher resistence than soldered joint. Spaced packs are much much better for your batts and they last a lot longer when spaced, even longer with a small fan, or looking at it another way, you can push them much more for the same amount of damage.. Please dont be tempted to stick the cells in cardboard tubes :-) You may as well heat them gently with a blow torch.