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I also use Lenmars (have 2) purchased from Amazon.
The fit (at the front curved edge where the release push button is located) is not flush to the camera body like with my two Canon batteries.
First one purchased a year or so ago, shot an event 1300+ pictures with 1D2 and battery indicator still showed full.
Purchased second one a month ago, recently shot an event 700+ pictures with 1Ds2 and battery indicator shows full.
As recommended by a forum member in an older thread, prior to using a new battery I use the REFRESH option on the Canon charger, and then let it stay connected to the charger for a least a couple hours after the charger indicates the battery is fully charged. I actually let it continue another 4-5 hours or so.
The thought being that the charger will indicate the battery is fully charged when really it is only say perhaps 95% charged. So keep charging particularly for that first charge. Don't know how accurate this is but doesn't seem to have hurt my batteries, particularly my first Lenmar. The second Lenmar I haven't yet run to empty.