If you are using a standard automotive type battery of (say) 35 AH just to start your engine then the answer is yes. If you are using marine batteries or deep cycle batteries then the answer is no. Your car charger probably only puts out 5 amps. Marine chargers typically have a minimum of 20 amps and variable charge rates to ensure that batteries are charged and maintained at the correct level. They are more expensive not because they are "marine" but because they perform a completely different function.