If your battery is old and you want to get rid of it, take it to Costco. Lead-acid batteries are toxic and will pose a danger if not disposed of properly. And as such, Costco helps recycle batteries the proper way to keep the environment safe.  For Costco members, this is also the best time to take back the core fee you paid when purchasing the battery. So aside from keeping the environment safe, you also gain back a few bucks from returning the old battery.