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[Reply #15 on:]

I already also heard, that the batteries are a bit more than 1.5V, maybe 1.6V or 1.7V. A new "1.5V"-battery I measured had a bit more than1.6Volts. That means that 1.6V*3=4.8V should be definitely still in the acceptable range for the laserpointer. Most of them are from China and hence don't have a manual with technical parameters.

The new Nickel-Zinc batteries are 1.8 volts when fully charged and a nominal voltage of 1.65 (http://en.wikipedia.org/wiki/Nickel%E2%80%93zinc_battery).

I recall last year in the camera forums, people were shouting about using the new NiZn batteries because it sped up their flash recharge times, and then about 6 months later reality set in, when it became apparent that some/all flashes weren't prepared for the higher voltage.  And if you mentioned using NiZn batteries, manufacturers might not honor warranties (http://strobist.blogspot.com/2011/01/nizn-batteries-long-term-update.html). 

[Reply #16 on:]

I recall last year in the camera forums, people were shouting about using the new NiZn batteries because it sped up their flash recharge times, and then about 6 months later reality set in, when it became apparent that some/all flashes weren't prepared for the higher voltage.  And if you mentioned using NiZn batteries, manufacturers might not honor warranties (http://strobist.blogspot.com/2011/01/nizn-batteries-long-term-update.html). 

The new wave NiZn recharagables have some interesting features, and the nominal voltage much closer to alkalines is one of them.  However, this does illustrate the point I was making rather well, you have to ensure your device can handle the total voltage of a battery pack at all charge levels.  Otherwise it can cause malfunctions and/or damage.