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Black rectangular 12V 18AH sealed lead-acid battery with terminals on top

BatteryJack inc.

BatteryJack inc. 12V 18AH SLA standard battery

SKU CH-MKBT-DV9WK

A 12V 18AH sealed lead-acid battery using AGM technology, maintenance-free with over 90% gas recombination and a 4-7 year expected life

  • 12 V 18 Ah capacity powers UPS and backup systems reliably
  • Advanced AGM technology recombines over 90 % of gas for leak-free operation
  • Maintenance-free sealed design needs no water checks during 4 to 7 year life
  • 100 % OEM replacement fits part numbers 51814 6fm17 6-dzm-20 6-fm-18 lcx1220p
  • Non-spillable construction meets IATA rules for safe transport in any position

What this battery replaces

The BatteryJack inc. 12V 18AH SLA battery is a direct 100% OEM replacement for part numbers 51814 6fm17 6-dzm-20 6-fm-18 and lcx1220p. It suits users who need a drop-in power source for UPS units, backup devices or other 12 volt systems that specify an 18 ampere-hour or 20 ampere-hour rating. The sealed construction allows safe operation in any orientation without electrolyte leakage.

Sealed AGM construction benefits

Advanced AGM technology uses fine glass-fibre mat separators that absorb sufficient electrolyte for steady service and prevent escape of fluid from the separator. Gas recombination controls generation and allows over 90% recombination of gas produced during normal use. The maintenance-free design requires no specific gravity checks or water additions throughout its expected floating service life of 4-7 years.

Capacity and interface limits

This unit delivers a nominal 12 volts and 18 ampere-hours, matching the 20 ampere-hour form factor it replaces. It is classified as non-spillable and meets International Air Transport Association requirements for transport. The standard terminal interface fits existing battery compartments, but buyers needing higher capacity, different voltage or alternative chemistry should consider other options.

How it compares

Measured against everything we stock in Household Batteries & Chargers, at today’s prices. Recalculated every night.

Price $46.99
Pricier than about 90% of the 10,440 comparable items (median $10.99).

Specifications

No published specifications for this item yet.

Questions about this item

When will the 12V 18AH SLA battery need replacement?

Expected service life is 4 to 7 years; the sealed AGM design is maintenance-free with no water topping or specific-gravity checks required during that period.

What limits runtime under continuous load?

The 18 amp-hour capacity sets the total energy available; once the stored charge is depleted the voltage drops and the unit must be recharged before further use.

Does the battery get hot or noisy when running all day?

Gas recombination exceeds 90 percent so there is no venting, no electrolyte leakage and no fan noise; the sealed case stays cool during normal float or backup operation.

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