Fulbat U1R-12 SLA Lawn & Garden SLA · Battery 32Ah 400A AGM

Yes. AGM (Absorbent Glass Mat) technology, 32 Ah and 12 V: sealed lead-acid, with the electrolyte held in glass fibre. Its advantages: more charge/discharge cycles than a conventional battery and better heat tolerance. It is also required in trucks with advanced Start-Stop and regenerative braking.

AGM batteries support advanced Start-Stop and regenerative braking thanks to their higher cycle count. The Fulbat U1R-12 SLA is AGM, so yes, it is designed for Start-Stop trucks. 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. It needs nothing to work, though on most modern trucks registering it via OBD is advisable so the alternator adjusts its charging profile.

As a rough estimate, the Fulbat U1R-12 SLA typically lasts 5 to 7 years in lorry use, even with high power draw while parked; it is a guide figure, not a guaranteed period. Actual lifespan varies with climate (cold starts, heat evaporating the electrolyte), with usage and short journeys, with the condition of the alternator and charging system, with power draw while parked and with maintenance; the type of truck and Start-Stop also count.

It measures 195×125×176 mm in length × width × height, with the terminals included in the height. Measure the battery tray before ordering: a one-millimetre difference is enough for the hold-down clamp not to close.

Polarity of the Fulbat U1R-12 SLA: positive on the right. It must match your current battery: reversed polarity means lengthening cables or reconfiguring the system, with a risk of short circuit. Seen from the front, terminals towards you, the positive (+) is the post with the red ring.

The quickest way is to enter your number plate in the finder: DGT/DVLA/KBA detect model and engine. You can also look at the "Compatible vehicles" tab, verified by our technical team, or send us make, model, engine and year on WhatsApp; we answer during business hours (Mon–Fri 10:00–13:30 and 16:30–18:00 (Spanish time, CET)). In every case, the truck manufacturer's specifications (owner's handbook) take precedence. The U1R-12 SLA typically fits a wide range of European vehicles thanks to its standard DIN case format.

The "Equivalents" section of this page gathers the recommended options with equivalent performance; remember that in Start-Stop trucks an EFB should not be replaced with a conventional battery. A battery interchangeable with the Fulbat U1R-12 SLA must match it on dimensions (195×125×176 mm), polarity (positive on the right), capacity (32 Ah) and cranking current (400 A).

AGM means Absorbent Glass Mat: the electrolyte soaks a glass-fibre mat (no spills), and an AGM battery lasts many more cycles than a conventional one. 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. Capacity of the U1R-12 SLA: 32 Ah.

It is not strictly necessary on most trucks, because the alternator detects the change and adapts the charge. The advisable step is to register it via OBD: the charging profile is optimum from the first minute and the battery lasts longer, especially on brands with sophisticated BMS (BMW, Mercedes, Audi, Volvo, Land Rover). Any garage with an OBD scanner can do it in a few minutes. If you prefer to do it yourself: VCDS / Carista (VAG), Bimmercode (BMW) or iCarsoft. Even if you do not register the Fulbat U1R-12 SLA, the truck will start correctly; the profile adjusts within a few days.