Eneloops, The downside of the 10180 is the short runtime on high. But it easy to carry a spare cell. The Peaks rock on Li-ion cells. They can handle the extra voltage without a problem. Much brighter than alkaleaks, lithium primaries or eneloops. The long AAA body with the momentary switch is nice, but it is long - longer than an AA twisty. The 10180 are tiny and you need a special charger. Just using a normal charger with spacers can ruin or at least reduce the useful life of the cells. Iluumination Supply sells the charger from the Quantum DD and D2. That's a nice light, too. But I prefer the Peak Eigers from Oveready. Cottonpickers also makes a charger. I don't have a 10280 and that may be a good compromise. Still small and with more runtime. And, yes I love those bow shackles, especially on these little Peaks.