---
title: "BCI Group 34 equivalent: Group 34, 34-, Group 34/78 (dual term"
description: "The BCI Group 34 is a 12 V lead-acid cell, also sold as Group 34, 34-, Group 34/78 (dual terminal). Full equivalents, what does not substitute, and where it is used."
url: https://atoneplace.net/battery/bci-34/
site: "At One Place"
---

# BCI Group 34 battery

**What replaces a BCI Group 34: Group 34, 34-, Group 34/78 (dual terminal)**

12 V lead-acid, 260 × 173 × 200 mm

The BCI Group 34 is a rechargeable 12 V lead-acid prismatic. The codes below are the same physical cell sold under different manufacturer names, and any of them will fit.

## Specification

- **IEC designation:** BCI Group 34
- **Nominal voltage:** 12 V
- **Chemistry:** Lead-acid
- **Size:** 260 × 173 × 200 mm
- **Rechargeable:** Yes

## Codes that mean the same battery

*Different manufacturers, one physical battery. Voltage, chemistry and dimensions all match.*

| Code | Fits? |
| --- | --- |
| Group 34 | Yes — same cell |
| 34- | Yes — same cell |
| Group 34/78 (dual terminal) | Yes — same cell |

## Codes that look close but are not

| Code | Why it is not a substitute |
| --- | --- |
| Group 78 | Same footprint but side terminals rather than top posts. The dual-terminal "34/78" has both and fits either application, which is why it is stocked so widely. |
| Group 24 | Same length and width, 25 mm taller. In a tight engine bay the hood may not close over a 24. |

## Where it turns up

- Dodge Ram, Jeep Grand Cherokee and Chrysler models
- Many GM cars and light trucks
- Performance and AGM upgrades
- Marine dual-purpose service

## Common questions

### What is equivalent to a BCI Group 34?

Group 34, 34-, Group 34/78 (dual terminal) — all the same 12 V cell under different manufacturer codes.

### Can I use a Group 78 instead of a BCI Group 34?

Same footprint but side terminals rather than top posts. The dual-terminal "34/78" has both and fits either application, which is why it is stocked so widely.

### Is the BCI Group 34 rechargeable?

Yes. Use a charger made for its chemistry and never substitute a primary cell of the same size.

## Related pages

- [6LR61 battery](https://atoneplace.net/battery/9v/)
- [BCI Group 48 battery](https://atoneplace.net/battery/bci-48/)
- [BCI Group 35 battery](https://atoneplace.net/battery/bci-35/)
- [BCI Group 51R battery](https://atoneplace.net/battery/bci-51r/)
- [BCI Group 65 battery](https://atoneplace.net/battery/bci-65/)
- [BCI Group 24F battery](https://atoneplace.net/battery/bci-24f/)
- [BCI Group 47 battery](https://atoneplace.net/battery/bci-47/)
- [BCI Group 27 battery](https://atoneplace.net/battery/bci-27/)
- [BCI Group 49 battery](https://atoneplace.net/battery/bci-49/)
- [BCI Group 24 battery](https://atoneplace.net/battery/bci-24/)
- [BCI Group 78 battery](https://atoneplace.net/battery/bci-78/)
- [CR-P2 battery](https://atoneplace.net/battery/crp2/)

## Sources

- Official vendor product documentation — At One Place (/about/)