Dirk, range figures are subject to a number of variables and figures quoted by suppliers tend to be optimistic and should not be taken too seriously. Some suppliers quote average figures but most will quote the best case scenario. In reality any bike doing 30 miles on a charge is doing so with a lot of help from the rider (Or gravity!).
Likewise many claims of battery life are optimistic and figures can easily be manipulated be measuring under different conditions. There is no reason why batteries of the same type from different manufacturers should have different lifespans if all other things remain equal. The reality with Lithium batteries is that they require care to stand any chance of approaching the typical quoted 500 cycles life.
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