The built-in battery of the WAZA-AIR cannot be replaced by the user due to the design of the unit.
CAUTION: Disassembling or modifying the WAZA-AIR or any of its accessories (except as instructed in the Owner's Manual) may affect product performance and void eligibility for repair services.
NOTE: Charging issues may not always indicate a battery malfunction. Factors such as ambient temperature or prolonged disuse can also affect charging performance. If the cause is unclear, contact Roland/BOSS customer support via Backstage (Roland Account required) or consult a local authorized dealer.