Tudor TB740 Technica · Car battery 74Ah 680A

Tool: a 10 mm spanner. Time: 15-30 minutes on almost every car, and up to double if the battery is not under the bonnet but in the boot or under a seat. If the car manufacturer lists any extra step in the handbook, follow it. More detail in how to replace the car battery. The right order: engine off and key out; disconnect the negative (−) first, then the positive (+); release the hold-down clamp, lift out the old battery and seat the new one in the same position (positive on the right), keeping the polarity; reconnect the positive (+) first and the negative (−) last.

Estimated lifespan of the Tudor TB740: 4 to 6 years in regular car use without Start-Stop. Treat it as an approximate guide, as every case is different. 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 car and Start-Stop.

Check the room available in your car, because a single millimetre too much can stop the clamp from closing. Its dimensions are 278×175×190 mm, also written 278x175x190 mm; the height already includes the terminals. In European terms it is a L3 case.

The TB740 has the positive on the right in a L3 case: that is its polarity. Face the battery with its terminals nearest you and see which side the positive post (+, red ring) is on. Compare it with the battery you are replacing: if it does not match, cables must be lengthened or the system reconfigured, with a risk of short circuit.

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)). The TB740 fits 1,457 verified vehicle versions in our database. Always cross-check with what the car manufacturer states in the owner's handbook.

Technology matters too: in Start-Stop cars, an EFB cannot be replaced with a conventional battery. The options at the same level are in the "Equivalents" section of this page. Interchangeable means the same dimensions, same polarity, same Ah and same CCA; for the TB740, 74 Ah (680 A cranking).

The AGM of this size: what cars with Start-Stop and regenerative braking fit from the factory, and a real durability upgrade over the TB740. Compared with the TB740 it has 2 Ah less and 80 A of cold cranking more. It costs 46,65 € more. Essential if your car has Start-Stop, regenerative braking or came with AGM; without those systems it is an upgrade you do not need to pay for.

It is the EFB version of the same case: it withstands far more start cycles than the TB740. Compared with the TB740 it has 4 Ah less and 80 A of cold cranking more. It costs 33,45 € more. You need it if the original battery label says EFB; in a car without Start-Stop the TB740 does the job and EFB only adds service life.