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

# BCI Group 78 battery

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

12 V lead-acid, 260 × 179 × 186 mm

The BCI Group 78 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 78
- **Nominal voltage:** 12 V
- **Chemistry:** Lead-acid
- **Size:** 260 × 179 × 186 mm
- **Rechargeable:** Yes

## Codes that mean the same battery

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

| Code | Fits? |
| --- | --- |
| Group 78 | Yes — same cell |
| 78- | 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 34 | Same footprint, top posts rather than side terminals. The 34/78 dual-terminal battery has both and is the safe buy when you are not sure which the car uses. |
| Group 65 | Longer and wider. Both are GM and Ford fitments and the trays differ. |

## Where it turns up

- GM cars and trucks with side-terminal cables
- Chevrolet Silverado and Tahoe of many years
- Buick and Oldsmobile sedans
- Older Chrysler models

> Side terminals take a bolt rather than a clamp. Overtightening strips the lead insert, and that is not repairable — snug is enough.

## Common questions

### What is equivalent to a BCI Group 78?

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

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

Same footprint, top posts rather than side terminals. The 34/78 dual-terminal battery has both and is the safe buy when you are not sure which the car uses.

### Is the BCI Group 78 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 34 battery](https://atoneplace.net/battery/bci-34/)
- [CR-P2 battery](https://atoneplace.net/battery/crp2/)

## Sources

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