If I hook two lithium batteries in serial and then hook the duo up to the stock zip battery in parallel could a diode be installed to prevent the charger from energizing the lithium batteries???
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"Did I.Q. 's just drop sharply while I was away?"- Ripley
The problem is that the voltage would block the diode-org bat untill the potential of the lithium drop below the drop of the diode and the orginal battery voltage.
I was looking through Jameco and notice they have some nicad stack to get 3v or more. They are around 60maH but two of those would make sense.