Batteries wear out. And due to the nature of lithium-ion batteries, disposing them in the trash is a HUGE no-no. (explosions and fires may occur).
Luckily, there are a lot of places that will take your batteries back (like your local Best Buy). To find your nearest recycling center, visit Earth911 and type in your area code.
Safe vaping is always priority number 1.
Take note, most of your e-liquid bottles (glass and plastic) can be stored in your recycling bins.