Walmart deep cycle battery
I don't want to start a keyboard war here, but I have a battery question. Have any on here used Walmart EverStart marine and rv batteries? I looked at the 27DC model. It has the words 750 MCA writte...
Forum Discussion
theoldwizard1 wrote:jkwilson wrote:wa8yxm wrote:
If it says MARINE it is not DEEP CYCLE.. if it says GC it is (GC-2)
Trolling batteries may also be DEEP CYCLE. But I've never seen them in the store.
They are deep-cycle batteries by definition. There is nothing magical about a golf car battery and nothing distinguishes them from a marine deep-cycle in construction or chemistry.
Not true !
Yes, the chemistry is the same, but there are differences in construction. True deep cycle batteries have thicker plates (one reason they weight more per cubic inch than dual purpose batteries) and the have more room at the bottom of the case.
Read this link The difference between starting and deep discharge batteriesx
Since I spent 11 years testing and evaluating primary and secondary batteries as an engineer, I don't think your link tells me much.
No, there are no differences in construction between the Everstart and Trojan that distinguishes either as a deep-cycle. The JCI 29 is a deep-cycle in every way it is possible to define the term. In general, a deep-cycle has fewer, thicker plates to handle the abuse that deep discharges inflict on the battery, while a cranking battery has many, thin plates to maximize contact between the plates and electrolyte to facilitate the chemical reaction during the short cranking period.
There are alloy changes and specific gravity changes that can improve battery performance and cycle life, but the presence or absences of these differences doesn't change the fact that a battery is or isn't a deep-cycle.
The most notable difference you see in chemistry is higher specific gravity. This is because the capacity of a battery is largely determined by the quantity of sulfuric acid ions in the case, so increasing the volume of the case or increasing the concentration of ions are two ways of increasing the storage capacity of a battery. Trojan is a common example with their 1.277 specific gravity and 12.72V OCV at full charge.
Any battery that can handle 50% DoD for years at a time as the JCI 29 can is a deep-cycle.
The only thing the term "marine" means on a battery is the terminal size and type.
