Plutonix;
Per the technical specs PDF from Eveready their Lithium Iron cells drop to between 1.5 and 1.6V very quickly once placed under any real load.
One new technology rechargeable cell that some devices do not like due to excessive voltage is the new Nickel Zinc battery. They have about the same voltage output as your Chinese lithium Iron ones but for longer after being put under load I understand. Also lower energy density than most current Nimh batteries.
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Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro
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http://groups.yahoo.com/group/Geared_hub_bikes/