I have been reading up on the Lynx, some say alkaline battery ok and some say do not use it. The 640 mercury battery is 1.35 volts and the alkaline battery is 1.5 volts. I understand the voltage drop on the alkaline verses the mercury. Changing battery more ofton should solve that, what am I missing? Any one have first hand knowledge? I do have a good handheld meter but thats just something else to carry.