My 100 cycles old BL-5J is at 1260 mAh (as measured by bq27200)..

Anyway, the values reported by most utilities on N900 are incorrect. The capacity is just a resistance from the battery, which is supposed to indicate the battery's capacity as new. It varies by 10% or so.

Last full charge, reporting.current and similar are only vaguely correct with brand new original battery, if even then.

So, I wouldn't pay that much attention to it...