Key points
- Ah is how much energy the battery stores. CCA is how much current it can deliver to start the engine.
- CCA figures quoted under EN, SAE, DIN and JIS are measured differently, so compare like with like.
- The size code fixes the case dimensions and terminal position. A battery that does not fit the tray cannot be clamped safely.
- AGM or EFB on the label means the replacement must be the same technology.
- Date code formats vary by manufacturer. We check freshness and voltage before fitting any battery.
Where to find the label and why it matters
The main label is on the top of the battery, and sometimes on the front face as well. It carries the numbers a technician needs to match a replacement: voltage, capacity, cranking current, size and technology. If the battery sits under a cover, in the boot or under a seat, the cover has to come off before the label can be read.
A clear photo of the label is the quickest way to get the right battery sent to you. Bear in mind that the battery in the car may not be the original. If a previous owner fitted the wrong size or type, the owner manual or the vehicle details are a better reference than the old label.
Voltage, capacity (Ah) and cold cranking amps (CCA)
Passenger car batteries are 12V. That is the nominal figure. A healthy, fully charged battery at rest reads a little higher, around 12.6V or more. Capacity is shown in amp-hours (Ah) and describes how much energy the battery can store. Bigger cars with more electrical equipment are specified with a higher Ah figure.
Cold cranking amps (CCA) describe the current the battery can deliver for a short time at a low test temperature to turn the starter motor. The label normally states which standard was used: EN, SAE, DIN or JIS. Each standard has its own test conditions, so the same battery carries a different number under each one.
Size codes: DIN/EN, JIS and BCI
The size code tells you the case dimensions and usually the terminal arrangement. Three systems are common in the UAE because the cars come from different regions. European cars use DIN/EN sizes, Japanese and many Korean cars use JIS sizes, and American vehicles often use BCI group sizes. A battery from the wrong system may not sit in the tray or reach the cables.
- DIN/EN codes such as L1, L2, L3, L4 and L5 describe a family of cases that share the same width and height and grow in length. The same cases are also sold under the names H5 (L2), H6 (L3), H7 (L4) and H8 (L5). A code starting with LB indicates a lower-height case.
- JIS codes such as 55D23L are read in parts. The first number is a performance rating, not the Ah figure. The letter is the case width and height class, the next number is the approximate length in centimetres, and a final L or R shows the terminal position.
- BCI group sizes, such as Group 24, 35 or 65, are numbers set by Battery Council International that define case dimensions and terminal layout. An R after the number means the terminals are reversed.
Terminal layout and polarity
Polarity means which side the positive terminal is on. Stand with the terminals on the edge nearest to you and note whether the positive (+) post is on the left or the right. The replacement must match, because battery cables are cut to length and will not stretch across the case. Forcing them risks a short circuit.
The terminal type matters as well. Most cars use standard round top posts, with the positive post slightly thicker than the negative. Many smaller Japanese batteries use thinner posts, and some American vehicles use side terminals. The positive terminal is marked with a plus sign and often a red cap or cover.
Technology marking: AGM, EFB or flooded
Batteries for start-stop cars are marked clearly, usually with AGM or EFB in large letters and often the words Start-Stop. AGM batteries may also carry the letters VRLA, meaning valve regulated lead-acid. A conventional flooded battery may have no technology marking at all, or terms such as SLI or maintenance free.
| Label term | Meaning |
|---|---|
| 12V | Nominal voltage of the battery |
| Ah | Capacity in amp-hours: how much energy the battery stores |
| CCA | Cold cranking amps: starting current under a stated test standard |
| EN, SAE, DIN, JIS (next to CCA) | The standard used to measure the cranking current |
| RC | Reserve capacity: minutes the battery can supply a set load |
| L2, L3, H5, H6 | DIN/EN case size |
| 55D23L and similar | JIS code: performance rating, case class, length and terminal position |
| Group 24, 35, 65 | BCI group size: case dimensions and terminal layout |
| AGM | Absorbent glass mat: sealed type for start-stop and high electrical demand |
| EFB | Enhanced flooded battery: strengthened flooded type for start-stop |
| MF | Maintenance free: no routine topping up |
| + and - | Positive and negative terminals |
Manufacture date codes
There is no single date format for car batteries. Each manufacturer uses its own. The date may be a code stamped or burned into the case or the lid, a number engraved near a terminal, or a small sticker showing month and year. Some use plain digits, others use a letter for the month and a digit for the year.
Because the formats differ, guessing is risky. A code that looks like a date may be a production line or batch number. Some batteries also carry a separate sticker that marks when the battery was shipped or last charged. If you cannot read the code with confidence, ask the seller to explain it, or ask the brand directly.
How we check freshness before fitting
A lead-acid battery slowly loses charge while it sits in storage, and faster in heat. One left for a long time without recharging can lose capacity before it is ever fitted. That is why the date matters, and why voltage matters just as much. A recently made battery stored badly is no better than an older one kept charged.
- We check the manufacture date marking on the battery before it leaves for your location
- We measure the voltage of the new battery before fitting
- We confirm size, polarity, Ah, CCA and technology against the car
- We show you the label and the date marking if you ask, and note the fitting date for the warranty of up to 24 months
Reviewed by technicians who test and fit car batteries across the UAE every day.