---
title: "BCI Group 51R equivalent: Group 51R, 51R-"
description: "The BCI Group 51R is a 12 V lead-acid cell, also sold as Group 51R, 51R-. Full equivalents, what does not substitute, and where it is used."
url: https://atoneplace.net/battery/bci-51r/
site: "At One Place"
---

# BCI Group 51R battery

**What replaces a BCI Group 51R: Group 51R, 51R-**

12 V lead-acid, 238 × 129 × 223 mm

The BCI Group 51R 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 51R
- **Nominal voltage:** 12 V
- **Chemistry:** Lead-acid
- **Size:** 238 × 129 × 223 mm
- **Rechargeable:** Yes

## Codes that mean the same battery

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

| Code | Fits? |
| --- | --- |
| Group 51R | Yes — same cell |
| 51R- | Yes — same cell |

## Codes that look close but are not

| Code | Why it is not a substitute |
| --- | --- |
| Group 51 | The identical box with the terminals swapped left to right. The R means reversed. Fitting the wrong one either leaves the cables short or, worse, invites someone to stretch them across and connect backwards. |

## Where it turns up

- Honda Civic, CR-V and Fit
- Acura ILX and other Civic-based models
- Nissan Versa, Juke and Cube
- Mazda 3 and some Mitsubishi models

## Common questions

### What is equivalent to a BCI Group 51R?

Group 51R, 51R- — all the same 12 V cell under different manufacturer codes.

### Can I use a Group 51 instead of a BCI Group 51R?

The identical box with the terminals swapped left to right. The R means reversed. Fitting the wrong one either leaves the cables short or, worse, invites someone to stretch them across and connect backwards.

### Is the BCI Group 51R 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 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/)
- [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/)