MPN

Fiamm 12V M5 Sealed Lead Acid Battery, 18Ah

RS Stock No.:: 843-1339
Mfr. Part No.:: FG21803
Brand:: Fiamm

Fiamm 12V M5 Sealed Lead Acid Battery, 18Ah

Subtotal (1 unit)*

£72.49

(exc. VAT)

£86.99

(inc. VAT)

FREE delivery for orders over £50.00

In Stock

22 unit(s) ready to ship
Plus 4 unit(s) ready to ship from another location
Plus 64 unit(s) shipping from 21 October 2025

Need more? Click ‘Check delivery dates’ to find extra stock and lead times.

Units	Per unit
1 +	£72.49

*price indicative

Alternative

This product is not currently available. Here is our alternative recommendation.

RS PRO 12V T12 Sealed Lead Acid Battery, 18Ah

RS Stock No.: 537-5494

Each

£82.60

(exc. VAT)

£99.12

(inc. VAT)

RS Stock No.:: 843-1339
Mfr. Part No.:: FG21803
Brand:: Fiamm

Find similar products by selecting one or more attributes.

Select all	Attribute	Value
	Brand	Fiamm
	Capacity	18Ah
	Nominal Voltage	12V
	Construction	AGM
	Terminal Type	M5
	Flame Resistant	No
	Dimensions	181 x 76 x 167mm
	Designed for Cyclic Application	No
	Designed High Rate Application	No
	Application	Stand by Use
	Eurobat Classification	3 to 5 Years
	Operating Temperature Range	-20 → +50°C
	Weight	5.8kg

	Select all
	Brand Fiamm
	Capacity 18Ah
	Nominal Voltage 12V
	Construction AGM
	Terminal Type M5
	Flame Resistant No
	Dimensions 181 x 76 x 167mm
	Designed for Cyclic Application No
	Designed High Rate Application No
	Application Stand by Use
	Eurobat Classification 3 to 5 Years
	Operating Temperature Range -20 → +50°C
	Weight 5.8kg

Lead Acid Battery FG Range - FIAMM

The Fiamm FG battery range is specially designed to achieve optimal performance and protect from power disruptions. The high quality battery ensures that no electrolyte leakages occurs from the case or terminals. This battery is almost maintenance free with the perfectly sealed construction and the recombination of gases within the cell.

This battery series uses a unique electrolyte suspension system incorporating a microfine glass mat (AGM) to retain the maximum amount of electrolyte in the cells.

Features and Benefits

Optimized for discharge up to 20 hours
5 year design life in float operation in temperature controlled environment
VRLA AGM and gas recombination technology with 99% internal recombination
Non-spillable and maintenance free
Non-hazardous for air/sea/rail/road transportation
100% Recyclable

Typical Applications

Alarm Systems
Communication Equipment
Emergency Lighting
Fire and Security Systems

FAQ's

GEL Vs AGM Lead Acid Batteries

AGM (Absorbed Glass Mat)

These batteries contain only enough liquid to keep the specially designed glass mat wet. The glass mat is made to wick the battery electrolytes between the battery plates. If the AGM battery is broken no free liquid leaks out.

AGM batteries are preferred when a large amount of amps are required. The life expectancy remains excellent in most cases, if they are not discharged more than 60% between recharges and/or recharged fully every 3-6 months.

Gel Cell Batteries

These batteries contains silica type gel, which is a thick paste like material. It allows the electrons to flow between plates, but will not leak in a gel battery if the case is broken.

Gel Cell Batteries don't offer the same power capacity as do the same physical size as AGM batteries. Gel cell batteries excel in slow discharge rates and slightly higher operating temperatures and with excellent deep cycle capability. Recharging these batteries must be done correctly or it will suffer a premature failure.

Are Lead Acid Rechargeable Batteries Harmful?

Lead acid batteries contain chemicals that have the potential to be harmful to both your health and the environment. They contain lead which is a highly toxic metal and sulfuric acid which is a corrosive electrolyte solution. Proper handling procedures must be followed at all times.

How to dispose of Lead Acid Batteries?

These batteries do contain hazardous chemicals so recycling is the only way to dispose of them.

Recycle responsibly. A wide range of schemes are available.

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