Joysick battery level change event structure (event.jbattery.*)
Defined in SDL_events.h
typedef struct SDL_JoyBatteryEvent
{
Uint32 type; /**< SDL_JOYBATTERYUPDATED */
Uint32 timestamp; /**< In milliseconds, populated using SDL_GetTicks() */
SDL_JoystickID which; /**< The joystick instance id */
SDL_JoystickPowerLevel level; /**< The joystick battery level */
} SDL_JoyBatteryEvent;