If you're not using a Li battery it should be kept at storage voltage (3.6-3.8V). Keeping a Li battery at 4.2V or below 3.2V unused will stress it.One more or more! I'm at 11 KFs, now. And a few other types of rebuildables, but the KFs, for me, are the reliable great toppers that I use most. A few of them are assembled from the various FT parts, and can be put together for about $10.
While weekly may be excessive for LIons, still a good practice. batteries will lose some charge just sitting, although Lions don't lose much. But keeping the emergency backups topped means they'll work when you need them! And a longer roation on charging would be too hard to keep track of...
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