by GroundquestMSA » Jul 8, 2013 2:19 pm
I bought a Spark ST-6 for my brother, and while it hasn't failed exactly, it does burn through batteries very quickly. The last time we used it, two "fully charged" batteries were depleted in only about 3 hours. The light was operated on the medium modes with occasional bursts of high. The light switches off with no warning and refuses to switch back on, which was a bit of a problem in one case since he was climbing a steep, difficult mudbank. He has been using the Ultrafire batteries and charger that came with the light. We're in the proccess of figuring out if it's a battery, charger, or light problem. I'm guessing battery/charger.