Does the mower have an electric clutch, and need to find out what the output on the charging system is. Could be a 10 or 16 amp system. but without electric clutch could just as easy be a 3 amp system for charging the battery and nothing else. With a 10 amp charging system and electric clutch any added lights can't exceed about 60 watts. or less. And could be enough to prevent recharging the battery in my example.