I said to myself during The site change previous to today's that I would replace the battery since it was down a bar, and of course I forgot, again. I think it's been down one bar for over a week. We haven't been pumping long enough to be really familiar with how long battery will last when down one bar. Any ideas? Would I be chancing the battery going dead tomorrow during school hours. I think I read that I should have a day after hearing first alarm. Is this correct?