I have several of the battery powered Sears portable tools (drill, vacuum, several lights, sawzall, etc) and 2 of the 19.2V batteries. They are about 2 years old, heck maybe 3. One of the batteries has gone weak and won't hold a charge. So now I am down to one good battery but usually need two batteries to get any job done. Buying a replacement battery is a little steep - about $35 - so I'm weighing my options. I keep watching but haven't seen them go on sale. Seems the new thing are lithium ion batteries but need to invest in a whole new set of tools/batteries. Anybody faced a similar situation and what did you end up doing?