However the high purchase price of an electric vehicle and the gradual deterioration of its battery are balanced out by the low cost of running and maintaining it. Suffice it to say that an electric car engine has a lot fewer moving parts than an internal combustion engine and that it therefore does not need to be serviced as frequently, nor is it as likely to break down. On top of that the American Tesla motor's experimental use of laptop battery technology promises to cut the cost of batteries down by over fifty percent, thus reducing both the purchasing price of the cars and the cost of replacing a battery.