I have identified a personal need. It is thus:Problem:
Some old NiMH cordless drill batteries are bad. Replacement batteries are hard to come by or annoyingly expensive.Solution:
Buy some NiMH batteries and make my own -- reusing the plastic casing of the originals. Need a low area of heat way of welding these batteries together to make a form-factor compatible battery pack. So I need a spot welder.
I have in my possession a Microwave Oven Transformer(MOV) and some knowledge.
Easiest to implement using an MOV is: http://hackaday.com/2009/06/23/how-to-b ... ot-welder/
but there are others that use Capacitive Discharge and cost a bit more: http://ledhacks.com/power/battery_tab_welder.htm http://ledhacks.com/power/tab_welder%20ii.htm
My thoughts are to build the first (Easiest) but making two "Wands" for hand placing the compression points instead of the "punch" style...
I don't have a lot of experience with either style (Capacitive Discharge or Transformer/high-current).
I would THINK a Capacitive Discharge spot welder would be more effective in creating a quick, local weld with minimal heat dissipation into the batteries, but both seem like they'd do the trick...
Does the Hacker Factory already have a low-heat, quick/localized discharge weld source? Would there be a use beyond my battery pack if I made one of these?
Any feedback/ideas would be great!