SP-404SX: How many hours can I play this instrument on battery power? May 25, 2021 06:06 Updated Follow Ni-MH battery (AA×6): Approx. 5 hours Alkaline battery (AA×6): Approx. 4 hours - This can vary depending on the specifications of the batteries, capacity of the batteries, and the conditions of use.- Do not mix batteries with different types and capacities. Related articles SP-404SX: Is a special carrying bag or case available? SP-404MK2: What types of power supply are supported? SP-404SX: Importing Samples SP-404MK2: What are the differences between the SP-404MK2 and the SP-404A/SX? SP-404MK2: How do I record a pattern in 3/4 time?