The Original Quantum Turbo Battery
The battery pack I am finding to be the best is the original Quantum Turbo battery which is no longer produced. The Turbo 3 and the Turbo 2x2 are better in terms of capacity and flash recycle time, but once the NIMH batteries inside those packs are spent then its time for a very expensive and time consuming replacement. When you send anything to Quantum, it takes 4 weeks to get it back and its expensive at that. In comparison, it is very cheap and easy to replace the lead acid battery in the original Quantum battery.
I find it rather difficult to get remotely excited by batteries but I have several original Turbo batteries which were all bought used, just keep on working and have all had their LeadAcid batteries replaced at low cost (£14 / $20). Because of this, they're probably one of the most cost effective batteries around.
Theres only one sun. Why do I need more than one light to get a natural result?