I have a number of cordless powertools. At this time they all use NiCad batteries but I plan on switching them over to Lithiums with time. The two manufacturers I use have both made the switch to Lithium so getting the battery packs and chargers is only a matter of cash...
My question is what is the best way to maintain the NiCads I currently have? I have several kits of multiple tools with two batteries, each will fit all tools and from two different manufactures. The first sets of batteries, from both manufactures lasted for years, always ready to use when I needed them. The second set of batteries for each set of tools are always dead when I need them and the run time seems much depleted even after charge.
Charging and use have remaind constent if not correct, I use the tool, maybe until the battery runs dead (tool will no longer do what I need) then charge and put everything away. The batteries are stored in the multi-kit installed in one of the tools. With the original batteries, the next time I usually pulled the drill, sazall, skillsaw, etc. out it would give me a few cuts, holes, etc. while I would charge the other battery. I could accomplish the task at hand. With the replacement batteries they are both close to dead, same tools, same chargers, same tasks, same logic (even if flawed), different results.
Standby times are typically 1 to 2 weeks. So my question is what is the best way (state of charge) to store NiCad batteries?