As for NiMH vs enloops I'd say that NiMH are good if you shoot specific days and know in advance so you can charge them up the night before, whilst enloops are far more grab and go friendly since they will retain charge between shoots. However always have a spare set of barreries on hand for when the do die.
Enloops
are NiMH batteries. They just hold their charge. There are plenty of NiMH batteries now that will also hold their charge. Low-resistance, no losing your charge after two days, and reasonable capacity. Great stuff. I have relatively cheap Panasonic NiMH's, and they work fine. (Better than fine; easily I can get 400 ETTL firings between 1/1 and 1/8ish on a 580EXII with one set.)
And actually, a "weak" recharger is a good thing. The slower the charge (with a lower amperage), the less stress put on the battery.