I'm new to the forum and have read much over the past weeks. My challenge is better understanding which battery chemistry may be best suited for an infrequently used flashlight; however, the light must work reliably every time I need it with no action on my part other than to turn it on. I've read Lion batteries tend not to do well if fully charged and allowed to sit unused for prolonged periods. NiMH batteries might need to be charged (topped off?) right before use; is this true for Low Self Discharge NiMH as well? I don't want to risk leakage from alkaline batteries. How do primary Lithium batteries handle a full charge for 6-12 months of no use? Better than LSD NiMH? Although not as environmentally responsible, infrequent use appears to favor primary batteries over the investment needed for rechargeable batteries and its very delayed break-even point, in my case. Other considerations? Thanks very much.