Leisure Batteries (frequently used for camping and caravanning but have other applications)( Some car batteries also come under the title 'leisure batteries)
In contrast to a standard starter battery, a leisure battery has to provide a steady flow of current over a prolonged period and seldom gets recharged until the user recognises that’s its Voltage level has substantially fallen. At this point, a recharge must be provided. If left for a long period in a discharged state, or left connected to a load which forces the battery into an over discharged state, a battery will not regain its former condition. These conditions can lead to the formation of soft shorts which will render the battery unserviceable.
It is general practice to market leisure batteries with some indication of the number of cycles that the battery can achieve at 50% state of charge. By design, increasing the number of cycles given by a battery (life and durability, rather than start-ability) involves the following:
• Adding more lead, generally using higher density active material during plate construction
• Using expensive materials designed to operate the cell packs at a higher pressure (whilst maintaining acid between the plates)
Conventional lead acid leisure batteries are considered to meet the demands of entry level to mid-range applications. Subject to the application, a durability range of 70 to 360 cycles @ 50% DOD is common. Recent investment and developments in micro hybrid automotive technology, which bears similar requirements to the leisure market, has resulted in improved conventional leisure battery durability.
http://www.gooutdoors.co.uk/caravanning/in-the-caravan/appliances/leisure-batterieshttps://www.amazon.co.uk/Leisure-Battery-12v-110Ah-Numax-XV31MF/dp/B0043QOA0S