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..I also use the toggle switch method, however I don't turn the toggle switch off until I'm completely done riding for the weekend. I never really notice a problem with the memory wire running down the batt unless it sits for a long time.
Sounds more like a bad battery from the start, a bad cell is internal problems with it, not just being drained from something being left on..
Mine will usually sit all week and get used on the weekends.. . from about 2 months, it nuked the battery... had it tested and it tested 'bad cell' and wouldn't charge.. hopefully the toggle switch will solve the problem.. my new battery is a 450 ish crankin amps and like 350 cold crankin.. I got it at napa for 50 bucks... dealer wanted 130