Yeah, not exactly sure what it is, if it's tolerances, a bad measurement or what. There's also tutorials on how to remanufacture an original pack, but sometimes I wonder if it's worth the effort with Lenmars being cheap enough. I'm thinking about picking up one or two used OE batteries, another Lenmar or Pearstone and swap the end caps. My Canon OE battery is good for less than 200 shots I believe.
BTW, I was wrong, the Lenmar replacements are $35 a piece, still better than $170 or so for the Canon OE ones.
Get the Lenmar. I tried one and it fit fine on my 1ds.
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