Basically we want to end up with a modified battery pack physically the same as before but with a decent figure 8 flex running from the bottom (offset to allow clip to close) and about 2mtrs long with battery terminal size alligator clips at the end.
To drop the voltage down from 12 to 9.6 we can use a few diodes.
We need to loose about 2.4V (12 – 9.6 = 2.4V)
Voltage drop across a silicon junction is 0.7 volts so:
3 diodes = 2.1V
4 diodes = 2.8V
However, we need to make some practical measurements…a full charged lead acid battery in good condition stands at 12.6V but most likely we are going to be using an old 2nd hand one with a lower terminal voltage.
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