Explanation of icon.
Function name:Lead

Voltage: 2V per cell

Shelf life: Supplementary charging is needed every 6 months. (Preservation in a completely charged condition is desirable.)

Price: Low cost, generally used with uninterruptible power systems

Charging characteristics: Constant voltage, Constant current

Fully charged level detection: Easy

Memory effect: None

Large current discharge: Excellent

Recycling: Recovery system is in place