Which battery technology makes more sense for outdoor solar garden lights? Mine came with NiCds that don't seem to be performing very well. They started out pretty well (would get through all but the cloudiest of days) but now they barely make it into the late evening hours.

I've got a bunch of low-discharge Eneloop batteries that I was going to try to use, but I was wondering if anyone has any experience with these. The interwebs have contradictory statements from people in both camps. If it's a toss-up, I'd prefer to use NiMH due to the lower environmental impact.