Check these beasts out!!!
Li-ion/Li-Po/LiFe/PCM - Li-Ion Cylindrical Rechargeable Batteries
Christ...a 2600mAh AA battery. Could just be the ticket to over 5 hours on my baby Stax!!!
People are reporting average of 5 hours on 1800mAh AA batteries (900 a battery). There are SINGLE AA batteries with 2600mAh! yeah, they're almost $10 a piece, but rechargeable, protected, and MUCH MUCH longer lasting.
Placing my order as we speak!