Emazing Lights eCharge - Rechargeable Elite Battery Pack (Set of 2) Charge is the ergonomic, earth-friendly, cost-saving solution to your light show addiction. One charge lasts you 20 hours, and only takes 1-2 hours to recharge Save your CR1620s for festivals and competitions! eCharge is perfect for hangouts, practice sessions, and those times when you just don't have batteries. Included: (2) eCharge Units, Dual MicroUSB Charging Cable, Instructions