What is a flooded lead-acid battery?

Flooded lead-acid batteries use accessible liquid electrolyte and service caps for maintenance. They are widely used in off-grid solar installations with moderate consumption, field cabins, light telecommunications, or backup applications where initial cost is a determining factor.

Advantages and limitations

• Price: the most economical option per ampere-hour.
• Availability: wide range of voltages (6V, 12V) and capacities.
• Maintenance: require periodic checking of electrolyte level and terminals.
• Ventilation: emit gases during charging; require a ventilated and safe location.
• Durability: service life depends on depth of discharge (DoD) and proper maintenance.

Recommended applications

• Small homes or shelters with occasional use.
• Basic domestic backup systems (UPS).
• Light telecommunications and signaling.
• Projects where initial cost is key and maintenance can be performed.

General technical specifications

AGM and GEL: sealed alternatives

If you cannot guarantee ventilation or do not want maintenance, consider AGM (sealed, good current delivery and vibration resistance) or GEL (sealed, excellent performance in deep cycle). Both reduce gas risks and simplify installation.

Installation and usage tips

• Adjust the charging voltages of the controller/inverter to the “flooded lead-acid” profile.
• Maintain the electrolyte level and periodically clean the terminals.
• Avoid frequent deep discharges to extend service life.
• Ensure ventilation and use an acid-resistant tray/container.

In summary, flooded lead-acid batteries are an economical and functional solution when ventilation is available and maintenance is acceptable. If you prefer sealed, maintenance-free systems, visit AGM or GEL.