Before watches and cell phones, people used primitive time-telling methods, such as monitoring the tides or measuring the shadow of a clock tower. Keep modern conveniences powered up with this Groupon.
- $9 for $20 worth of batteries<p>
This Groupon can be used for any batteries in the shop—from watch batteries ($8.95 including installation) to car batteries.<p>
Interstate All Battery Center
Interstate All Battery Center has been in the power biz since 1950, when it started out of founder John Searcy's red Studebaker pickup truck. Back then, it acted exclusively as a purveyor of car batteries. In the decades since these humble beginnings, Interstate Batteries has become one of the country's top brands for replacement batteries and has branched out to power a smorgasbord of gadgets and applications. The business now supplies juice to cameras, phones, and even heart pacemakers. They don't just simply supply batteries, though—for the last 55 years, the center has collected and recycled lead-acid batteries to avoid environmental hazards and diminish gluttony in the robot community.