# Long LG40-12N · Electric wheelchair battery 12V 40Ah

![Long LG40-12N · Electric wheelchair battery 12V 40Ah](https://bateriasonline.es/873-home_default/long-lg40-12n.jpg)

> Long LG40-12N: 40 Ah electric wheelchair battery, 199×166×171 mm, positive terminal on the right, GEL. Equivalent to MK Battery 8G40.

**Category:** [Electric wheelchair batteries](https://bateriasonline.es/en/electric-wheelchair-batteries) → [Long](https://bateriasonline.es/en/long-batteries)

- **Canonical URL**: https://bateriasonline.es/en/long-lg40-12n
- **Language**: en
- **Brand**: Long
- **Reference**: BOL-LONG-LG40-12N
- **MPN**: LG40-12N
- **Price**: 185,81 € (VAT incl., Spain)
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Long |
| Range | LG Series |
| Application | Electric wheelchairs |
| Technology | GEL |
| Voltage | 12 V |
| Capacity | 40 Ah |
| Length | 199 mm |
| Width | 166 mm |
| Height | 171 mm |
| Weight | 13.3 kg |
| Polarity | Positive terminal on the right |

## Quick description

Long LG40-12N: electric wheelchair battery with 12 V and 40 Ah, measuring 199 × 166 × 171 mm, with the positive terminal on the right.

## Description

## Who the Long LG40-12N is for

The Long LG40-12N is made for powered wheelchairs. With 40 Ah per battery, the LG40-12N is designed for a full charge every night.
The LG40-12N belongs to the Long LG Series range. [More Long batteries](https://bateriasonline.es/en/long-batteries)

## Equivalents and alternatives to the Long LG40-12N

Gel alternatives to the LG40-12N, with the same size and polarity: a gel charger does not treat an AGM or a flooded battery the same way.

| Model | Technology | Capacity | Dimensions (mm) |
|---|---|---|---|
| MK Battery 8G40 | GEL | 40 Ah | 197.1 × 168.1 × 174.8 |
| MK Battery M40-12 SLD G | GEL | 40 Ah | 197.1 × 168.1 × 174.8 |
| Deka 8G40 | GEL | 40 Ah | 197.1 × 168.1 × 174.8 |
| Long LG40-12 | GEL | 40 Ah | 199 × 166 × 171 |

## Long LG40-12N vs LG45-12 and LG45-12N: differences

The real differences between the LG40-12N and the closest Long models:

| Model | Capacity | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|
| Long LG40-12N (this one) | 40 Ah | 199 × 166 × 171 | right | 13.3 kg |
| Long LG45-12 | 45 Ah | 199 × 166 × 171 | right | 15 kg |
| Long LG45-12N | 45 Ah | 199 × 166 × 171 | right | 15 kg |

- Long LG45-12: 5 Ah more, the same dimensions.
- Long LG45-12N: 5 Ah more, the same dimensions.

## GEL technology in the LG40-12N

Inside, the LG40-12N holds its electrolyte in gel form. It is the classic technology for wheelchairs, scooters, motorhomes and solar.

## Check this before ordering the Long LG40-12N

- The LG40-12N needs 199 × 166 × 171 mm of space: measure it with the hold-down clamp in place.
- With the terminals facing you, the positive terminal of the LG40-12N is on the right.
- Your current battery should say about 40 Ah; a little more is also fine.

## Part numbers and codes for the Long LG40-12N

Shops, garages and catalogues identify the LG40-12N with these codes:

| Commercial reference | LG40-12N |
|---|---|
| Not to be confused with | Long LG20-12N (20 Ah), Long LG45-12N (45 Ah), Long LG50-12N (50 Ah) |

## Frequently asked questions about the Long LG40-12N

### LG40-12N or LG45-12: which one suits me?

Compared with the LG40-12N, the Long LG45-12 has 5 Ah more. With 45 Ah, the LG45-12 runs longer between charges than the LG40-12N (40 Ah). Both measure 199 × 166 × 171 mm, so they fit the same tray.

### How much does the Long LG40-12N weigh?

13.3 kg, with 40 Ah of capacity. For reference, the Long LG45-12 (45 Ah) weighs 15 kg.

### Which battery is equivalent to the Long LG40-12N?

For the LG40-12N, other gel batteries with its size and polarity: MK Battery 8G40, MK Battery M40-12 SLD G and Deka 8G40.

### Which side is the positive terminal on the Long LG40-12N?

On the LG40-12N, the positive terminal is on the right with the terminals facing you: compare it with your current battery, because with reversed polarity the cables will not reach.

### Which charger does the Long LG40-12N need?

A charger with a GEL mode not exceeding 14.1-14.4 V. Charging it with a conventional lead-acid profile damages it through overcharging.

## More batteries to compare with the LG40-12N

- [More electric wheelchair batteries](https://bateriasonline.es/en/electric-wheelchair-batteries)
- [The whole Long range](https://bateriasonline.es/en/long-batteries)
- [MK Battery 8G40](https://bateriasonline.es/en/mk-battery-8g40) · 40 Ah, 197.1×168.1×174.8 mm
- [MK Battery M40-12 SLD G](https://bateriasonline.es/en/mk-battery-m40-12-sld-g) · 40 Ah, 197.1×168.1×174.8 mm

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*bateriasonline.es — Batteries and accessories · 2026-11-11*