Why only deep cycle marine batteries at Walmart

[Donald]

Lead antimony batteries are much more tolerant of deep discharges than lead calcium starter batteries used in automotive applications. Their big downside is that they offgas more and require watering which is one reason for the switch to lead calcium in car starter batteries. Any battery labeled maintenance free is lead calcium and is not a true deep cycle.

Batteries on a boat are often a PIA to check the cells as you often need to move or remove the battery so you can see into the cells.

 

[Donald]

The more I read about true deep cycle batteries the more I think about life would be easier with AGM batteries.