AGM, EFB, GEL and lithium batteries: differences and which to choose

Two batteries with the same amp rating can behave very differently depending on their technology. These are the five you will find in our catalogue.

Conventional (lead-acid)

Liquid electrolyte. The most affordable option for cars without Start-Stop and with little electrical equipment. It copes poorly with deep discharges.

EFB (Enhanced Flooded Battery)

An evolution of the conventional battery, with reinforced plates. It withstands roughly twice as many cycles and is the factory-fitted battery in many cars with basic Start-Stop.

AGM (Absorbent Glass Mat)

The electrolyte is absorbed in glass fibre: it cannot spill, accepts fast charging and handles many cycles. It is mandatory in cars with Start-Stop and regenerative braking, and widely used in motorbikes, UPS systems and motorhomes.

GEL

The electrolyte is gelled. This is the technology that best withstands deep, repeated discharges, which is why it is common in wheelchairs, mobility scooters and solar installations. It needs a charger with a GEL profile.

Lithium (LiFePO4)

Much lighter, it allows 80-90 % discharge and delivers thousands of cycles. Its upfront price is higher and it requires a compatible charger. It is ideal for motorhomes, boats and solar storage.

Which battery to choose for each use

• Car without Start-Stop: conventional or EFB.
• Start-Stop car: the same technology as the original (EFB or AGM). If it came with AGM, always AGM.
• Motorbike: maintenance-free AGM or lithium.
• Motorhome and boat (leisure): AGM, GEL or lithium.
• Solar: GEL, OPzS or lithium for systems in daily use.

Any questions? Call us on +34 627 45 96 87 and we'll give you the exact reference. All our prices include VAT and delivery to mainland Spain.