Reasons For A Flat Battery. The leading causes of vehicles breakdowns are flat or faulty batteries. Car batteries need the chance to recharge or re-boost themselves and making short trips aren’t enough to give your battery that chance. There are some things that you can do to increase the longevity of your battery, but if you do happen to get a flat battery, there are some reasons that this may have happened.. Here are the most common reasons for a flat battery: Use of the vehicle for very short periods Lack of use of the vehicle Faulty component or something left on (e.g. light) has drained it The battery has a fault The vehicle’s charging system has a fault. Your battery should not remain below 12.4 volts, or else it could result in hardening of the lead plates (which is a process known as sulphation). When sulphation occurs, the battery has difficulties holding or accepting a charge. Some other reasons for a flat battery may include: Excessive vibration Corrosion Over charging Extreme temperatures Always aim to figure out the cause of a flat battery, so that you can take the necessary steps to prevent any future battery problems. You can come to us for help. If you are looking for small engine repair services in Ottawa, mobile car battery boosting, mobile tire changes, or snow blower and lawn mower repairs then give us a call to book your mobile small engine repair today. We repair and tune-up small engines such as lawn mowers and snow blowers. The best part is that we come to you so no more waiting in line or traveling back and forth to fix your small engine equipment.