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Put some WD-40 in the chuck and use the chuck key to loosen up the chuck. The speed switch is going bad too. Those parts are readily available and aren't too difficult to change yourself if you pay close attention to which terminal on the new switch the wires connect to.
Yes you can. On tools, 18 volts is 18 volts. Tools don't 'know' how the power is being created, either by Ni-Cad or Li-Ion means. Chargers are totally different. Most Li-Ion chargers can charge older Ni-Cad and some Ni-MH batteries but older Ni-Cad chargers will charge Li-Ion battery untill they overheat and sometimes start on fire because older chargers can't detect when the Li-Ion batteries are full.
Many of these have a torque clutch that is used in screwdriver mode that will slip when a certain torque is reached as set by the ring around the chuck area. If you want it to not slip, usually you set it on a symbol that looks like a twist drill.
I did get an educated electronics eng. tell me li ion batteries 4handtools,are manufactured to only be recharged a set number of times,to avoid tool damage.
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