The Nominal voltage of Alkaline batteries is 1.5V, or 3V for a pair. As the batteries age, this voltage will decrease until the unit will no longer function.
The nominal voltage of NiMH batteries is 1.2V and a pair would be 2.4V. While this is enough to run the Cyber Commander, however, as the batteries discharge, the voltage drops even lower. The threshold for the unit to quit working is the same, regardless of battery type. In essence, you are effectively putting in old batteries.
Also, most MiMH batteries self discharge rather rapidly, so the would likely need to be charged before every use.
Will using rechargeable hurt the Cyber Commander? No. But the lower voltage can cause problems faster than would happen with alkaline or lithium batteries. We have heard reports of people successfully using Low Self Discharge rechargeable batteries (like Eneloop or similar). While the battery life per charge may not be as good as with alkaline, the lower self discharge rate apparently allows sufficient battery life to be usable. Your Mileage May Vary.
As for the other products in the CyberSync line, NiMH are perfectly acceptable batteries for their use.
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