Ok, basically I got a Versa/A606 and it came with some standard no brand LIR 18500 batteries and a charger that only charges one battery at a time. I purchased some additional batteries, which are Efest IMR 18500, and all I want to know is if it is safe to charge these new batteries using the other charger? The batteries appear to make some kind of high pitched noise when I stick it in the charger which makes me nervous, but they do not appear to be getting very hot in any way. They make a noise with the original batteries too, but its more quiet. Thanks, just don't want anything bad to happen.