I dunno', I don't trust those meters they put in the TT's. There have been a few folks that found them inaccurate.
If you really want to know what condition your battery is in, take it to an auto parts house for a load test. While you're there, have them dip it with their hydrometer. If/when you want to get real technical with battery maintenance, buy a good hydrometer. Francis Freas makes lab grade hydrometers or, maybe in Ontario, look for one off Ebay to avoid cross-border shipping.