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Sealed Lead Acid Batteries (SLA)Although lead acid batteries have been commercially available for more than a century, they continue to be in wide use where size and weight are not key factors. Best suited to stationary or wheeled applications, Sealed Lead Acid batteries (SLA) are easy to maintain, have a low self-discharge rate and are less expensive than other rechargeables. However, their low energy density makes them bulky and heavy. In addition, they must be stored in a charged state. Many SLA batteries prefer a shallow discharge because a deep discharge can reduce the cycle life of some SLAs. Two Sealed Lead Acid chemistries are notable: Pure Lead Tin SLAs are more effective in cyclical applications like scooters and wheelchairs, or where wider operating temperatures are required-as in outdoor applications. Links to suppliers' technical specifications for Pure Lead Tin SLAs:
Lead Calcium batteries are typically found in standby power applications like security systems, or where low cost is a requirement. They are often used in emergency lighting and UPS systems. Links to suppliers' technical specifications for Lead Calcium batteries:
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