Tudor TZ850 · Marine battery 12V 100Ah 900A EFB

Marine battery Tudor TZ850 100Ah 900A 12V

The Tudor TZ850 with EFB technology is a marine battery with 100 Ah and 900 A of cold cranking current (EN) for motor and sailing boats, both for engine starting and onboard services. Its 353 × 175 × 190 mm and the positive terminal on the right make it the exact replacement for the 100 Ah battery fitted as standard to many boats.

• Resistant to humidity and salt air.
• Sealed: no spills or gases in the locker.
• Ready for starting outboard and inboard engines.
• EFB: the evolution of the conventional battery for basic Start-Stop cars.

What the Tudor TZ850 is for

On board, the Tudor TZ850 provides 100 Ah with a case reinforced against vibration and swell. Keep the terminals clean and protected from salt humidity. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 25.50 kg, EN taper post terminals and B13 hold-down.

Technology inside the Tudor TZ850

The TZ850 is one of the Tudor references for this type of use; it shares the same manufacturing and quality-control criteria as the rest of the brand's catalogue.

EFB (Enhanced Flooded Battery) technology reinforces the conventional lead-acid battery with a polyester separator and carbon additives in the plates. It withstands many more start cycles and partial discharges, making it ideal for basic Start-Stop and intensive use.

Size, terminals and hold-down of the Tudor TZ850

The Tudor TZ850 is made in the 353 × 175 × 190 mm format and weighs 25.50 kg. The positive terminal on the right decides which side the cables end up on: it is the detail that causes most buying mistakes, so check it before ordering. It uses a B13 hold-down and EN taper post terminals, the system that anchors and connects it in the vehicle. For a direct replacement, the current battery tray must accept these dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change.

Why choose Tudor batteries

Tudor is Spain's historic battery brand, today part of the Exide group. Its car, truck, motorcycle and leisure ranges are built with the same technology and controls as the group's original-equipment references. All the Tudor batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty.

Usage and maintenance tips

A charger with an EFB or smart conventional mode is enough; avoid the high-voltage modes intended for AGM. At the end of the season, charge the battery fully and, if possible, keep it on a charger over the winter lay-up.

Warranty and coverage

The Tudor TZ850 comes with the manufacturer's official warranty against manufacturing defects. Deep discharge from winter lay-up without charging is not covered.

Delivery times and returns

Order before 6:00 pm with stock available and it leaves today: mainland Spain and Portugal receive it in 24-48 working hours, the islands and the rest of the EU in 3 to 5 days. You have 14 days to return it if it has not been installed, with free collection on the mainland, and shipment tracking by email.