The Petzl Reactik has a rechargeable battery pack which is removable and you can get a spare rechargeable battery pack and/or a battery pack that holds AAA batteries (either rechargeable or alkaline).
Great advice here. I would add that the peak is a bit isolated so it creates its own weather patterns. The summit is very exposed and typically has high winds. Plenty of tree cover on the approaches and on the ridge though.
Timber Camp Trail departs Greeley Ponds Trail to the west, approximately halfway between the Goodrich Rock Trail and the southern Greeley Pond. This trail has a large clearing with excellent views about halfway up where the road turns into an overgrown trail that heads north/west into the woods...