I bought two of these batteries about a year ago, for my Canon SX230HS. They didn't hold much of a charge at the beginning, but I thought I would give them a chance to "improve" over a few charge cycles, as LiIon batteries need to do. Unfortunately, they never really hold as much of a charge as the Canon original battery. I should have known, since these actually feel a little lighter, too... obviously they aren't the same.
To give an idea, the Canon battery works well for a good long time. Both of these batteries seems to last about 1/3 to 1/4 of the time as the Canon. That's just terrible. I suppose it's better than nothing, but dying out after about 30 pictures is unacceptable.
Sad thing is, I've had great luck with Lenmar batteries in the past. This particular model is awful. I can't imagine it's a one-off issue, as both of my batteries perform similarly poorly. My recommendation - spend the extra for a different brand (or just bite the bullet for the Canon original).