FIAMM 12FLB250P 12 V 75 Ah AGM UPS Battery

12FLB250P is a 12 V AGM battery from the FIAMM FLB series, which the folder calls one of the maker’s most popular batteries and uses extensively for UPS backup. It is listed at 257 W per cell for 15 minutes, 75 Ah at 10 hours and 80 Ah at 20 hours, in a 260 x 168 x 214 mm case of 24 kg.

The mid-size FLB block for UPS cabinets with limited shelf space

FLB batteries carry a 10 to 12 year design life in a rugged flame-retardant ABS case and exist in top-terminal and front-terminal designs. FIAMM highlights the energy density of the compact construction, which reduces costly installation space.

The 12FLB250P is the fourth of ten types in the folder table, from 12FLB100P to 12FLB700P. It follows 12FLB200P (204 W, 53 Ah) and precedes 12FLB300P (311 W, 78 Ah), so it suits single-phase and small three-phase UPS cabinets where six or more blocks stack in a battery drawer.

Design points stated for the FLB range

• Design life of 10 to 12 years; Eurobat 10/12 years long life for top-terminal models.
• Flame-retardant ABS to UL94 V0 guaranteeing safety and thermal stability to avoid case bulging.
• AGM VRLA technology, 99 percent recyclable and fully maintenance-free.
• Non-hazardous designation: can be transported by road, rail or air.
• Optimised design for low self-discharge during storage.

Technical specification

Data printed for 12FLB250P in the FLB folder

Related FLB types from the same table

Derived values (calculated here, not printed)

Matching the FLB250P to a UPS battery tray

The folder prints UPS-style power per cell, so compare the 257 W figure with the watts per cell calculated by your UPS maker for the end voltage and runtime you need. Neighbouring types differ by roughly 3 to 7 kg, so check the weight limit of drawers before substituting.

A 12FLB250P string for a 192 V DC bus needs 16 blocks; that count is a derived design example, not a data sheet statement.

Installation, torque and charging notes from the manual

The manual torque table lists FLB at 5 to 6 Nm on M5, 7 to 9 Nm on M6 and 10 to 12 Nm on M8 posts; use a torque spanner so the threaded terminals are not damaged. Insulate every connector with the supplied covers and keep 5 to 10 mm between blocks.

Float at 2.27 V per cell and 20 °C, which gives 13.62 V per block, apply a yearly boost charge at 2.40 V per cell, and record the float voltage at the battery terminals every six months. These are AGM-manual values for the whole range.

UPS and standby duty in industrial plants and buildings

The FLB is tagged for data centre and UPS use, telecom and industry. Typical Gulf installations include process-control UPS rooms, switchgear control supplies and building-management backup. General engineering note: AGM blocks run best near 20 °C according to the manual, so avoid siting trays above chillers or in sun-loaded rooms.

Related FIAMM items

FHB is the high-rate, 30 °C-rated version in the same case sizes, FGL covers smaller general-purpose blocks, and the manual describes the remote venting system used with FLB top covers.

Battery room and maintenance notes

UPS batteries in the region are used in offices, hospitals, banks, data rooms and industrial control systems. Battery life depends strongly on temperature, so the UPS room or cabinet should be air conditioned and monitored, and the charger’s float voltage and temperature compensation should be set as given in the manual. A UPS cabinet placed in a warm corridor or plant room can lose a large part of the expected battery life.

When replacing batteries in an existing UPS, check the dimensions, terminal type and capacity of the existing blocks and match them, and replace the whole string at once rather than mixing old and new blocks. Torque the connections to the values in the manual and recheck them after the first months. Record block voltages during routine maintenance so weak blocks are found early.

Information to send with an enquiry

• UPS model and the existing battery type
• Number of blocks per string and strings
• Required autonomy
• Quantity

Frequently asked questions

What power does 12FLB250P give?

The folder lists 257 W per cell for 15 minutes to 1.67 volts per cell at 25 °C.

What capacity is printed?

75 Ah at 10 hours to 1.80 volts per cell and 80 Ah at 20 hours to 1.75 volts per cell.

How much does it weigh?

24 kg typical, in a 260 x 168 x 214 mm case.

Is the photo of this exact type?

No. It is the FLB family render and the label on it reads 12FLB400P; the alt text says so.

What is the stated design life?

The folder gives 10 to 12 years for the FLB series.

Documents and quotation

For quotation, send your required quantity and destination. The FIAMM datasheet and user manual for 12FLB250P are provided below the description on this page. Seven Star LLC works as an independent supplier from Muscat. Please compare code, ratings and options with the documents before you place an order; see also the category listing.