[Mauribix]

Even if the mA capacity should be slightly different, usually the durability difference should be exponential when related to the same power use (not constant by the way).
i.e.
the durability of a 2000mA vs 2500mA battery is not just 20% less, it should be something getting more and more evident as the use goes on.
I guess Mark (Norton) should be able to calculate it exactly.
Anyway, I just bought once an HK battery (3 times cheeper than Leica's), but that never made my day, so I bought 2 other original ones, and I'm quite happy with them.