If you intend to let your car sit for some time better do it with the battery removed and stored in a place where you can control the environment and definitely out of the reach of children and pets. Although charging a car battery while still connected or in situ is possible its always a good idea to disconnect the battery before charging after a quick clean. Car Battery Charging Station Battery Charging Station Car Battery Hacks Car Battery Charger Turn Off All Car Electronics. . The downside of this method of battery charging is that overcharging may occur which can cause. DEWALT 30 Amp Automotive Portable Car Battery Charger with 80 Amp Engine Start and Alternator Check. If any electronics remain powered on during charging the battery may experience an electrical arc during the process. Often times this rears its ugly head when a battery is left in a vehicle that hasnt started for a long period of time or the vehicle h...