I bought a battery from Wal-Mart 2 months ago and I'm assuming it was delivered by UPS. I thought my battery (original) was dieing. I cranked it the other night after a week of sitting (outside) and it fired right up. Must be my switch going out instead. I need to install the new one anyway before it goes bad just sitting. I'm sure a little more juice couldn't hurt.
Remember - you get a new battery when you buy a new bike.