Sealed Lead Acid
Lead acid technology is more than 100 years old but continues to be widely used where size and weight are not key factors. Sealed Lead Acid is often used in power back-up or stationary devices as well as electric wheelchairs and other similar products.
Sealed lead acid batteries are easy to charge and give a reasonably accurate indication of their state of charge by looking at their voltage. They have low self-discharge and are inexpensive.
Sealed Lead acid batteries are available in an enormous array of sizes and shapes including single 2 volt cells.
