XPost: rec.crafts.metalworking   
   From: muratlanne@gmail.com   
      
   "David Billington"  wrote in message news:saj5oh$he0$1@dont-email.me...   
      
   I worked out the peak current by measuring the motor resistance and   
   selected suitable new cells from a vendor which could supply them with   
   tabs already welded on. With the cost of the cells and a few other bits   
   it might have been better to buy a new drill as it might not have been   
   much more expensive but it was interesting to do it. I've only done the   
   one pack at the moment but have all the bits ready to do the 2nd just   
   need to get the soldering iron out.   
      
   ---------------------------   
      
   After wiring the battery connection adapter I measured the fully On   
   resistance as 4.8 Ohms, likely that high because it has an electronic   
   variable speed control. Restraining the chuck with my hand as best I could,   
   the 20A power supply current-limited and dropped to 4V, and a (very) quick   
   check on the last half-decent NiCad peaked at 35A.   
      
   The drill has plenty of torque on a 12V lead-acid which may be how I power   
   it to raise the head of my sawmill between logs.   
      
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