/r/gamemaker hosts a 48-hour game design and development contest called the gm(48) every quarter. You can find out more about the gm(48) here.
If properly cared for, however, you should get a number of years out of your battery, assuming that you own a gasoline powered or diesel fueled vehicle. If you own a hybrid, or an electric car, you can expect to get an amazing eight years of auto battery life before you have to think about replacing it. Batteries.
The price of different electric car batteries varies depending on the size and type of battery you want. All batteries are rechargeable and last for about 7 years, so you will not have to worry about electric car battery cost very often. Most expenses associated with your electric car's battery will be for recharging.