Compare Sealed Lead Acid (SLA) and Flooded Lead Acid (FLA) batteries for backup power, solar, and more.
1. Construction
Característica
Sealed Lead Acid (SLA)
Flooded Lead Acid (FLA)
Also known as
VRLA, AGM, Gel
Wet Cell
Electrolyte
Immobilized (gel or absorbed)
Free liquid sulfuric acid
Sealed
Sí
No
Maintenance
Maintenance-free
Requires refilling
2. Maintenance & Handling
SLA: No water refilling, low spillage risk, can be mounted in any position.
FLA: Needs regular water topping, must remain upright, requires ventilation.
3. Performance Comparison
Factor
SLA
FLA
Lifespan
3–5 years
5–10+ years
Costo
Higher upfront
Lower upfront
Deep discharge
Moderate (AGM is better)
Better tolerance
Temperature tolerance
Better in cold
Better in heat
4. Best Use Cases
Sealed Lead Acid (SLA)
Sistemas UPS
Emergency lighting
Medical and mobility devices
Small solar backup systems
Flooded Lead Acid (FLA)
Off-grid solar systems
Golf carts, forklifts
Industrial backup power
5. AGM vs. Gel vs. Flooded
Type
Maintenance
Position Use
Costo
Ciclo de vida
Temp Tolerance
AGM
Ninguno
Any
Medium
Moderate
Good
Gel
Ninguno
Any
Higher
Longer
Poor in cold
Flooded
Needs water
Upright only
Lower
Moderate
Good
6. Summary: Which Battery Should You Choose?
If you want a low-maintenance, clean, and compact solution for indoor or short-term backup, choose SLA. If you’re comfortable with periodic maintenance and want a longer-lasting battery for heavy-duty or off-grid use, FLA is a strong choice.
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