Our products will need the batteries replaced every 1-2 years as the batteries will begin to wear down. They will either take an AA, AAA, or Coin Rechargeable Battery (NOT a conventional alkaline disposable battery).Products that take Rechargeable Coin Battery - 1.2 V 40 mAh Coin • Solar Tea Lantern = 1 Coin Battery• Solar Terrarium = 1 Coin Battery• Solar Drop = 1 Coin Battery Rechargeable batteries are very common to come by these days. Many local convenience stores, hardware stores and local markets carry rechargeable batteries. You can also purchase them at your local Hardware Store. NOTE: All Batteries ship USPS from our Corporate Office, you will not receive a tracking number.The rechargeable coin battery for our Tea Lantern can be found at www.batteriesinaflash.com.