Fulbat U1-9 SLA Lawn & Garden SLA · Battery 28Ah 300A AGM

Yes: the U1-9 SLA from Fulbat uses AGM (Absorbent Glass Mat) technology, a sealed lead-acid battery whose electrolyte soaks a glass-fibre mat. Compared with a conventional battery it withstands more charge/discharge cycles and handles heat better; it is the required technology for trucks with advanced Start-Stop and regenerative braking.

Yes, the AGM technology of the U1-9 SLA is built for Start-Stop. AGM batteries support advanced Start-Stop and regenerative braking thanks to their higher cycle count. If the truck recovers energy when braking, AGM is recommended for its higher cycle count; for basic Start-Stop, EFB. The manufacturer's specification comes first. Registering it via OBD is advisable on most modern trucks (the alternator then applies the optimum profile), but it works from the start.

There is no exact figure: for a battery such as the Fulbat U1-9 SLA (AGM), a reasonable guide is 5 to 7 years in lorry use, even with high power draw while parked. What weighs most: temperature (cold makes starts harder and intense heat evaporates the electrolyte), frequent short trips, the condition of the alternator and charging system, power draw while parked and maintenance, not forgetting the type of truck and Start-Stop.

Length × width × height: 195x125x176 mm. Height is measured to the top of the terminals. Measure your truck's battery tray first; if the battery exceeds it by even a millimetre, the hold-down clamp may not close.

It has the positive on the left (polarity). If your current battery has its positive on the other side, this one is not suitable without longer cables or a reconfigured system (short-circuit risk). Put it in front of you, terminals towards you: the post with the red ring and the + sign is the positive.

The U1-9 SLA typically fits a wide range of European vehicles thanks to its standard DIN case format. Three routes: the "Compatible vehicles" tab on this page, with the vehicles verified by our technical team; your number plate in the finder, from which DGT/DVLA/KBA detect model and engine; and WhatsApp, with make, model, engine and year, during business hours (Mon–Fri 10:00–13:30 and 16:30–18:00 (Spanish time, CET)). If our table and the truck handbook disagree, go with what the manufacturer says.

See the "Equivalents" section of this page for the recommended options at the same performance level. Mind the technology: in Start-Stop trucks an EFB is not swapped for a conventional battery. A battery interchangeable with the Fulbat U1-9 SLA must match it on dimensions (195×125×176 mm), polarity (positive on the left), capacity (28 Ah) and cranking current (300 A).

Hence it is recommended for advanced Start-Stop with regenerative braking, such as BMW EfficientDynamics, Mercedes Eco, Audi MHEV, Land Rover ECO or Volvo i-Stop, and it handles tilting, vibration and extreme temperatures better than an EFB. Many more charge/discharge cycles than a conventional battery and no leaks: that is what AGM technology brings, with the electrolyte absorbed in glass fibre. Capacity of the U1-9 SLA: 28 Ah.

On most trucks it is not strictly necessary: the alternator detects the new battery and adapts the charge by itself. It is advisable, though, to register it via OBD so the optimum profile applies from the first minute and the battery lasts as long as possible, especially on brands with sophisticated BMS (BMW, Mercedes, Audi, Volvo, Land Rover). Without registration there is no starting problem: the alternator adjusts the profile within a few days. To do it yourself: VCDS or Carista on VAG, Bimmercode on BMW, iCarsoft. At a workshop with an OBD scanner it takes minutes.