Volt slippers do include batteries and a charger, but sometimes you may need additional heating time or replacement batteries.
Replacement battery set includes:
(2) Batteries
Battery Specifications:
• 3.7V 2.2AH Li-Ion Battery Pack
• Input: 4.2V 1A
• Output: 3V, 4.2V 2A Max
• Battery Life: 500+ Cycles