Sealed Lead Acid (SLA) batteries are one of the most widely used rechargeable battery types in the world. SLA batteries virtually require no maintenance and can be used in almost any position. They are the least expensive type of rechargeable battery which makes them suited for a wide variety of applications. SLAs have the lowest self-discharge rate of any rechargeable battery, only about 5% per month, and they do not suffer from memory effect. Depending on the depth of cycle and operating temperature, SLA batteries typically have a lifetime of approximately 300-500 cycles.