Type

Pros

Cons

Gel Cell

• Better for rough service environments
• Leak proof
  Can be installed on its side with small drop in performance
  Less susceptible to low temperatures
• When charged correctly does not vent much gas
• Low self discharge rate

• Higher initial cost than Liquid Cell
• Electrolyte cannot be replaced 
• Charging tolerances are tighter; cannot be charged over 14.2V without damage
• Not ideal for use with automotive or unregulated chargers
• NOTE all lead acid batteries sulphate if left discharged and require maintenance charging

AGM

• Maintenance-free
• Leak proof when tipped or if case is cracked 
• Used for both deep cycle or starting batteries
• Can be installed at any angle (except upside down)
• Shock and vibration resistant
• Minimal gas release when 
  charged properly
• Low self-discharge rate
• Can be submerged in water without internal damage (battery terminals will corrode)
• Many charge cycles when properly charged
• Better performance for DC loads

• Highest initial cost of all three types
• More weight per Ah than wet cells
• Electrolyte cannot be replaced 
• NOTE all lead acid batteries sulphate if left discharged and require maintenance charging

Liquid Cell - also called Flooded Lead Acid

(FLA)

• Lowest cost to purchase by amp hour
• Less sensitive than the other two styles in accepting higher charging voltages and less expensive / less regulated charging methods 
• Good deep cycle performance

• Can spill corrosive battery acid
• Must be installed upright
• Requires regular maintenance 
• More quickly damaged if left discharged
• NOTE all lead acid batteries sulphate if left discharged and require maintenance charging
• Not suitable for high vibration environments