Vehicle engines require cranking power to start while in the fridge motor requires the cranking power to trigger the gas chamber. The battery that power the the motor and engine , i would called it in Arabic "المنتع " it is drawn little by its self and the " التنتيع" is that the one is re- charged through the turbine or the motor coil.
Here, this video
touched the batteries clips to stator to draw more batteries.
Here, this video
the drill draw little power little power because, the battery couldnt handle the amperage. the drill need more voltage to get enough amperage to run the the drill. the single 12 v battery has the power , if you connect a boost converter capabel of the amp.
Another solution, is here in the video.
The drilling machine motor can be run on both DC and AC. that mean need to rewind the its coil to 12V.
The motor is in series that means the stator winding and rmotor (armature) windings are in series .
Pwer = V X Current.
high Voltage X Current low
High pwr X Voltage high
it may lead to increasethe dimater of winding wire .
the 18 v, 20 v cordless tools to gaine power output tourqe of 60 lbs. 20:22 mm tuns cooper wire , 2X4 turns from 0.5 mm cooper wire .