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I have a 4.2 volt drill and the battery life is really annoying so can i replace battery with a 5 volt soldered input to directly power the drill, or could i use 12 volt to directly power the drill. Which one is more safe? Id like to challenge myself with this project. Are there any limitations. I just want it to work. i.e. : my device does not exist on ifixit site so ill attach an image.
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To use 5vdc all you need to do is connect the battery and drill away. All battery device will usually handle as much as 3 VDC more than they are rated. As far as 12 vdc you will need to drop the voltage and the easiest way to do the is hard wire a cigarette lighter to cell phone adaptor inline between the battery and your device. I personally have modified the connections on many of my 18 VDC and some 14 VDC devices to connect to a 24 VDC pack I .ade and so far so good.
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The risk of using a 12v battery on a 4.2v small electric screwdriver may result in premature burnout of the motor from over voltage and current. Not advisable as this can shorten its life. Using a 5v source from a battery is safer and allows longer life as an external power source. Three 1.5 volt batteries adds up to 4.5 volts. A little higher if using rechargeable batteries. The physical size of batteries determines how long the power lasts.
F Dryer さんによる