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I bought one of these before Christmas. Its run time was advertised at 3hrs, which I guess mine achieved when new. After perhaps a dozen or so charges that has decreased to around two hours.
Anyone else had similar battery issues? If so, have you returned your battery to DX? What is their position on warranty?
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I got mine through Lumilite. I've been through 3 chargers and 2 batteries (admittedly Lumilite have been very forthcoming with replacements, and are UK based so quick response) and get about 2 to 2.5 hrs constant on high after two years use. I get away with 4 hr night rides by switching to low on all the flat/easy bits (having a p7 torch for a helmet light helps too).
Oh and the power light is always red so I don't know when its going to shut off, but I guess you get what you pay for.