My thoughts were more towards the fact that if I charge the battery indoors & put it on my bike right before I leave for work that the battery should start out warmer & theoretically stay warmer than the battery left out in the garage all night. If the battery starts @ 70 degrees & cools during the 30 minute ride to work, it should still be warmer for the duration (or at least a portion of the ride) resulting in better battery life than one that starts out @ 40 degrees (or whatever). I just wasn't sure if colder or warmer was more advantageous.