Even though they are designed to withstand deep cycling, these batteries will have a longer life if the cycles are shallower. All lead-acid batteries will fail prematurely if they are not recharged completely after each cycle. Letting a lead-acid battery stay in a discharged condition for many days at a time will cause sulfation of the positive plate and a permanent loss of capacity. They never need watering or an equalization charge. They cannot freeze or spill, so they can be mounted in any position.
Sealed batteries require very accurate regulation to prevent overcharge and over discharge.
Either of these conditions will drastically shorten their lives. We recommend sealed batteries for remote, unattended power systems. Caring For Lead-Acid Batteries Always use extreme caution when handling batteries and electrolyte. Wear gloves, goggles and old clothes. When they discharge, there is a chemical change in the positive plates of the battery.