Varta A40 ProMotive EFB · Truck battery 140Ah 800A

Yes: the A40 (140 Ah) is an EFB, an evolution of the flooded lead-acid battery with additives that strengthen the plates. It goes into trucks with basic Start-Stop (no energy recovery when braking): more cycles than a conventional battery, fewer than an AGM, and cheaper than an equivalent AGM.

EFB batteries cover basic Start-Stop (no regenerative braking). The Varta A40 is EFB, so yes, it is designed for Start-Stop trucks. Basic Start-Stop: EFB. Start-Stop with regenerative braking: AGM, which withstands more cycles. Check the handbook for the technology the truck manufacturer requires. It works once fitted; on most modern trucks, registering it via OBD is advisable so the alternator applies the optimum charging profile.

Most lorries, buses and tractors run on 24 V with two 12 V batteries connected in series. Always replace both at the same time and with the same model: if one is new and the other old, they become unbalanced and both last less.

As a rough estimate, the Varta A40 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. Many factors play a part: how it is used (lots of short trips, for example), temperature (cold makes every start harder and intense heat evaporates the electrolyte), the condition of the alternator and charging system, power drawn with the engine off and maintenance, as well as the type of truck and whether it has Start-Stop.

The Varta A40 takes up 513×189×223 mm (length, width and height, terminals included). Before buying, measure the space in your truck: one extra millimetre can stop the hold-down clamp from closing.

For your own vehicle: type your number plate into the finder (DGT/DVLA/KBA identify model and engine), check the "Compatible vehicles" tab below, listing vehicles verified by our technical team, or message us on WhatsApp with make, model, engine and year; we reply during business hours (Mon–Fri 10:00–13:30 and 16:30–18:00 (Spanish time, CET)). The A40 typically fits a wide range of European vehicles thanks to its standard DIN case format. The truck manufacturer's specifications always take priority over our tables.

A direct equivalent needs what this A40 offers: 513×189×223 mm, the same Ah and CCA and EFB technology. 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.

It is the AGM of the same case: more cycles, more cranking and better resistance to power draw at standstill than the A40. Compared with the A40 it has 100 A of cold cranking less. It costs €269.80 more. Essential if the vehicle requires AGM from the factory or draws a lot with the engine off; in conventional use the A40 does the job and AGM adds service life.

It is the verified Tudor equivalent for the A40 tray. Compared with the A40 it has the same Ah and cranking power. It costs €235.90 more. Decide by price, brand preference and availability: both fit and crank the same.

The EFB (Enhanced Flooded Battery) is a reinforced flooded battery: plates with carbon and polyethylene additives and thicker grids, giving it more cycles than a conventional one; for cycles and deep discharges it still sits below an AGM. Renault Energy TCe, Peugeot/Citroën PureTech, Fiat MultiAir, Hyundai/Kia ISG and Ford EcoBoost are examples of basic Start-Stop (no regenerative braking) fitted with it from new. EFB is the right technology if your truck came with one from the factory (moving up to AGM is optional and the gain marginal). If it came with an AGM, fit an AGM instead.

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). Without registration the truck starts normally; the alternator simply takes a few days to adjust the profile. 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.