Trojan’s deep-cycle AGM (absorbed glass mat) batteries feature a number of design elements to provide optimum performance. Robust plates extend the lifecycle of Trojan’s deep-cycle AGM batteries. A separator of glass fibers serves to isolate the positive and negative plates while acting as a blotter to absorb the electrolyte. The separator is maintained under compression between plates to assure contact with the plate surfaces resulting is reliable power generation. A computer-generated, low calcium grid design is optimized for high-power density, and allows for reduced gas emissions. In addition, the battery features a flame arresting, one-way press relief vent to prevent buildup of excessive pressure. Trojan’s deep-cycle AGM batteries are low temperature tolerant, shock and vibration resistant, and have a low internal resistance for higher discharge current and high charging efficiency.