augustsea

My 97 maxima got a Check engine light on, then do a onboard Diagnostic display code 0903. Leave the car overnight, the battery die two days later(did't work on the car). Jump start and check engine light is off. Drive it to recharge and test. Suddenly the ABS, Brake, battery light is on. the light is on when engine go beyond 1500 RPM and is off when idle. Yesterday do the 0903 (translate to P0446 EVAP canister vent value circuit valve fail) procedure as the manual. Today the battery dead again. Should be able to start and drive, but I am concern maybe some short circuit drained the battery.
What happend to my car!? Is it just a bad battery or some overhaul in the circuit loop?