My experience with Sigma lead seal batteries is that they are "junk". I have an Evo Evo X combo that I am converting to NiCd. If this work well my bike shop has a Mirage with the same problem that they have had sitting around for 3 years. I told the manager if this works out with my current lights I will be back to buy the Mirage at wholesale. He smiled. Anyone else had the same experience with Sigma batteries and/ or converting to NiCd?