I had mine about a year and one has gone dead. Delved into the battery compartment and found that they take an 18650 Flat top battery. The one supplied is a NiCad, which develops battery memory over time. I suggest relacing with at least an NiMh battery, though lithium would be better, but more pricey. Neither NiMh or Lithium batteries will develop battery memory.be sure to get Flat top batteries and a charger to go with !
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