AGM Batteries
More about AGM Batteries
AGM stands for Absorbent Glass Mat. The electrolyte is bound in a glass fibre mat. The battery is sealed, maintenance-free, leak-proof and vibration-resistant. It handles high currents and frequent charge cycles better than a classic flooded battery. These are lead batteries. The category includes AGM batteries for cars with start-stop, motorhomes, boats and solar. Below you will find a selection guide with the most important criteria.
Briefly answered: AGM battery
What is an AGM battery?
AGM stands for Absorbent Glass Mat. The electrolyte is bound in a glass fibre mat. The battery is sealed, maintenance-free, leak-proof and vibration-resistant. It handles high currents and frequent charge cycles better than a classic flooded battery. It is a lead battery.
Which cars is an AGM battery suitable for?
Cars with an automatic start-stop system and many consumers often have an AGM or EFB battery from the factory. If an AGM battery was installed from the factory, it is replaced with an AGM battery again. An AGM battery can also fit as a replacement for a flooded battery if the dimensions, polarity and capacity match and the vehicle allows it.
Which AGM battery fits my car?
First check the capacity in Ah of the old battery. The new battery should have at least the same capacity. Pay attention to the design and dimensions, which must fit in the battery box, as well as the polarity. The cold cranking current should be at least equal to the original. Compare reference numbers.
Does a new AGM battery need to be registered?
In vehicles with battery management, the new battery must be registered or learned in the control unit on some manufacturers. The type and capacity are stored in the process. Whether this is necessary for your vehicle depends on the manufacturer. The vehicle manual or a specialist workshop provides information on this.
Can I install an AGM battery instead of a flooded battery?
An AGM battery can fit as a replacement for a flooded battery if the dimensions, polarity and capacity match and the vehicle allows it. If an AGM battery was installed from the factory, replace it with an AGM battery again and not with a flooded battery. Check the information in the vehicle manual.
How do I charge an AGM battery?
AGM batteries are maintenance-free and handle frequent charge cycles better than flooded batteries. Use a charger with an AGM characteristic. The maximum charging voltage of the Electronicx AGM supply batteries is 14.4 V. Observe the information from the charger manufacturer and the vehicle manual.
Updated: 08.10.2026
How to choose the right AGM battery
The selection is made in five steps. First check the old battery and the installation conditions.
- Choose a capacity in Ah at least equal to the old battery. The figure is on the battery label or in the vehicle manual.
- The design and dimensions (L × W × H) must fit in the battery box. Note the bottom bar B13.
- Check the polarity: positive terminal on the right or left. Looking at the battery, terminals facing you.
- Choose a cold cranking current (A, EN) at least equal to the original.
- Compare reference numbers or OE numbers of the old battery on the product page.
In vehicles with battery management, the new battery must be registered in the control unit depending on the manufacturer. Ask in the vehicle manual or at a specialist workshop.
AGM starter batteries for start-stop and cars
The table shows the AGM starter batteries with positive terminal on the right and bottom bar B13.
| Capacity | Dimensions L × W × H | Cold cranking current (EN) | Positive terminal | |
|---|---|---|---|---|
| 60 Ah | 242 × 175 × 190 mm | 700 A | right | to the item |
| 75 Ah | 278 × 175 × 190 mm | 750 A | right | to the item |
| 80 Ah | 315 × 175 × 190 mm | 800 A | right | to the item |
| 95 Ah | 353 × 175 × 190 mm | 950 A | right | to the item |
| 105 Ah | 393 × 175 × 190 mm | 950 A | right | to the item |
Further pages: Car batteries for start-stop | AGM battery explained | AGM, EFB or standard in comparison | Guide: registering the battery | Disconnecting the car battery: instructions
AGM batteries from Electronicx
AGM stands for Absorbent Glass Mat: the electrolyte is absorbed in a glass fibre mat. The battery is sealed, maintenance-free and leak-proof. In this category you will find all AGM batteries of our own brand Electronicx:
- Starter batteries for cars: 12 V, 60 to 105 Ah, for vehicles with and without start-stop system.
- Motorcycle batteries: 6 V and 12 V, for motorcycles, scooters, quads and mopeds.
- Leisure batteries: 12 V, 80 to 140 Ah, for motorhomes, caravans, boats and solar systems, as Caravan, Marine, Mobile and Solar Edition.
- Backup battery: 12 V, 12 Ah, as a backup battery for the vehicle electrical system. The vehicles it is intended for are listed in the item description.
- Lawn tractor: U1 and U1R type, 12 V, 30 Ah.
Sizes of the AGM leisure batteries
| Capacity | Dimensions (L × W × H) |
|---|---|
| 80 Ah | 242 × 175 × 190 mm |
| 100 Ah | 278 × 175 × 190 mm |
| 110 Ah | 315 × 175 × 190 mm |
| 120 Ah | 353 × 175 × 190 mm |
| 140 Ah | 393 × 175 × 190 mm |
The dimensions apply to all editions of the same capacity.
AGM, GEL or LiFePO4?
- AGM: delivers high currents and is suitable both as a starter battery and as a leisure battery. For a long service life it should not be deeply discharged on a regular basis.
- GEL: copes well with slow, deep discharge and is mainly intended as a leisure battery. For high starting currents in a car, AGM is the better choice.
- LiFePO4: lighter than lead batteries of the same capacity and can be discharged more deeply. Charger, DC-DC charger and solar controller need a LiFePO4 charging profile.
How to find the right battery
- By vehicle: Use the vehicle search on this page to select make, model and year. For cars you can also enter the numbers from the German vehicle registration certificate (HSN and TSN).
- By your old battery: In the battery finder on this page you can search by the type or battery number of your old battery, by dimensions and by polarity.
- Dimensions: Length, width and height must fit the battery holder or battery compartment. The dimensions are given for every item.
- Positive terminal: Look at the battery from the front, with the terminals at the front: positive terminal on the right means layout 0, positive terminal on the left means layout 1. With reversed polarity the cables usually do not reach.
- Capacity (Ah): For starter batteries, choose at least the capacity of the old battery. For leisure batteries, the capacity depends on your daily consumption.
- Cold cranking current (CCA): The value in A (EN) should be at least as high as that of the old battery.
Charging correctly
Set your charger, DC-DC charger and solar controller to the AGM charging profile. The permissible charging voltage is given in the item description.
Shipping, statutory warranty and old batteries
Orders received by 14:00 on working days are shipped the same day. Statutory warranty rights apply.
Old batteries must not be disposed of with household waste. You can return them free of charge at municipal collection points or to retailers. In Germany, the Battery Act Implementation Law (BattDG) requires a deposit of EUR 7.50 including VAT on starter batteries if no old battery is returned at the time of purchase. Further information is available in the battery law notices at the bottom of this page.
Find a motorcycle battery by vehicle
Choose make, model and year – we'll show you which battery fits your motorcycle or scooter.
Popular makes
All makes A–Z
Your motorcycle isn't listed?
Find a car battery by vehicle
Enter the registration certificate numbers or choose make, model and year – we'll show you which AGM battery fits your start-stop system.
Popular makes
All makes A–Z
Vehicle registration certificate part I: fields 2.1 and 2.2 are in the top left. Older registration certificate (before 10/2005): fields “zu 2” and “zu 3”.
Source of vehicle names: Kraftfahrt-Bundesamt (German Federal Motor Transport Authority)
The number is usually on the battery's label. Spaces, dots and hyphens don't matter.
Your vehicle isn't listed?
Battery Finder
Choose what you need the battery for and its capacity. Or search precisely by size, polarity and old battery number.
1What for?
Car / start-stop
5 items
Motorcycle & scooter
95 items
Lawn tractor
2 items
Leisure battery (motorhome, boat, solar)
44 items
2Capacity
3Search precisely: size · polarity · old number
Information on returning used batteries (German Battery Act)