# Batteries 309 × 172 × 221 mm

> Looking for a battery measuring 309 × 172 × 221 mm (length × width × height)? These 1 models fit that tray exactly, with capacities of 66 Ah and prices from 225.70 €, VAT included.

## Available models

| Modelo | V | Ah | CCA (EN) | L×An×Al mm | Tech | Polarity | € VAT incl. | Stock | URL |
|---|---|---|---|---|---|---|---|---|---|
| Marine battery Optima BTDC-5.0 12V 66Ah 765A AGM | 12 | 66 | 845 | 309×172×221 | AGM |  | 225,70 | ✓ | https://baterias.com/gb/battery-optima-blue-top-btdc-50-8027-227-12v-66ah |

## Frequently asked questions

### Which battery measures 309x172x221 mm?
The 1 models on this page fit a 309x172x221 mm tray exactly (length × width × height), with prices from 225.70 € VAT included.

### Can I fit a slightly smaller battery?
Yes, if it is properly clamped with the original fixing: a few millimetres less in length or height is usually fine. What never fits is a battery LARGER than the tray, and watch terminal height so it does not touch the bonnet.

### Which capacities exist in 309x172x221 mm?
In this size you will find batteries of 66 Ah. For equal size, more Ah and more CCA usually means a better battery for your car.

### Do the dimensions include terminals and the hold-down ledge?
Yes. We publish each battery's total maximum volume: hold-down ledge, lid edges and terminal height where they protrude. If your tray takes these figures, the battery fits safely.

### Can I change technology while keeping this size?
Yes, always equal or upwards: from conventional to EFB or AGM is fine — they share the standard case — but never downwards in Start-Stop cars. Each model's technology is shown on its card and you can filter by it above.

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Updated: 2026-10-26 · https://baterias.com/gb/batteries-309x172x221