# MK Battery M40-12 SLD M · Electric wheelchair battery 12V 45Ah

![MK Battery M40-12 SLD M · Electric wheelchair battery 12V 45Ah](https://bateriasonline.es/3595-home_default/mk-battery-m40-12-sld-m.jpg)

> MK Battery M40-12 SLD M: 45 Ah electric wheelchair battery, 198.1×166.1×170.9 mm, AGM. Equivalent to Kronobat ES45-12 and Long WP45-12.

**Category:** [Electric wheelchair batteries](https://bateriasonline.es/en/electric-wheelchair-batteries) → [MK Battery](https://bateriasonline.es/en/mk-batteries)

- **Canonical URL**: https://bateriasonline.es/en/mk-battery-m40-12-sld-m
- **Language**: en
- **Brand**: MK Battery
- **Reference**: BOL-MK-M40-12 SLD M
- **EAN**: 8404653009069
- **MPN**: M40-12 SLD M
- **Price**: 124,08 € (VAT incl., Spain)
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | MK Battery |
| Range | MK AGM |
| Application | Electric wheelchairs |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 45 Ah |
| Length | 198.1 mm |
| Width | 166.1 mm |
| Height | 170.9 mm |
| Weight | 14.47 kg |

## Quick description

MK Battery M40-12 SLD M: electric wheelchair battery with 12 V and 45 Ah, measuring 198.1 × 166.1 × 170.9 mm.

## Description

## Who the MK Battery M40-12 SLD M is for

The MK Battery M40-12 SLD M is a deep-cycle battery for electric wheelchairs: sealed, maintenance-free and built to discharge and recharge every day without losing capacity. With 45 Ah per battery, the M40-12 SLD M is designed for a full charge every night.
The M40-12 SLD M belongs to the MK Battery MK AGM range. [More MK Battery batteries](https://bateriasonline.es/en/mk-batteries)

## Equivalents and alternatives to the MK Battery M40-12 SLD M

As the M40-12 SLD M is an AGM battery, we only list other AGM batteries with its dimensions and polarity: neither an EFB nor a conventional battery can replace it.

| Model | Technology | Capacity | Dimensions (mm) |
|---|---|---|---|
| Kronobat ES45-12 | AGM | 45 Ah | 198 × 166 × 171 |
| Long WP45-12 | AGM | 45 Ah | 199 × 166 × 171 |
| Long WP45-12N | AGM | 45 Ah | 199 × 166 × 171 |
| Long WP45-12NE | AGM | 45 Ah | 199 × 166 × 171 |
| Fullriver HC44 | AGM | 44 Ah | 198 × 166 × 170 |
| Ritar RA12-40B | AGM | 42 Ah | 198 × 166 × 171 |

## MK Battery M40-12 SLD M vs ES50-12 and M50-12 SLD M: which one to choose?

The real differences between the M40-12 SLD M and the closest MK Battery models:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| MK Battery M40-12 SLD M (this one) | 45 Ah | 198.1 × 166.1 × 170.9 | 14.47 kg |
| MK Battery ES50-12 | 50 Ah | 198.9 × 166.1 × 170.9 | 15.06 kg |
| MK Battery M50-12 SLD M | 50 Ah | 198.9 × 166.1 × 170.9 | 15.06 kg |

- MK Battery ES50-12: 5 Ah more, the same dimensions.
- MK Battery M50-12 SLD M: 5 Ah more, the same dimensions.

## AGM technology in the M40-12 SLD M

The M40-12 SLD M is AGM: the electrolyte is absorbed in glass fibre mats, so it is sealed and spill-proof. Being sealed, the M40-12 SLD M can be fitted in the boot or under a seat with no risk of spills.

## Before ordering the M40-12 SLD M, check this

- The M40-12 SLD M needs 198.1 × 166.1 × 170.9 mm of space: measure it with the hold-down clamp in place.
- With 45 Ah, the M40-12 SLD M replaces an original battery of that capacity or slightly less.

## MK Battery M40-12 SLD M codes and part numbers

Look for any of these M40-12 SLD M codes on your current battery or in the manufacturer's catalogue:

| Commercial reference | M40-12 SLD M |
|---|---|
| EAN | 8404653009069 |
| Not to be confused with | MK Battery M20-12 SLD M (20 Ah), MK Battery M40-12 SLD G (40 Ah), MK Battery M45-12 SLD M (45 Ah) |

## Frequently asked questions about the MK Battery M40-12 SLD M

### MK Battery M40-12 SLD M or ES50-12?

Compared with the M40-12 SLD M, the MK Battery ES50-12 has 5 Ah more. With 50 Ah, the ES50-12 runs longer between charges than the M40-12 SLD M (45 Ah). Both measure 198.1 × 166.1 × 170.9 mm, so they fit the same tray.

### How much does the MK Battery M40-12 SLD M weigh?

The M40-12 SLD M weighs 14.47 kg. For reference, the MK Battery ES50-12 (50 Ah) weighs 15.06 kg.

### Which battery is equivalent to the MK Battery M40-12 SLD M?

Only other AGM batteries with its dimensions and polarity: Kronobat ES45-12, Long WP45-12 and Long WP45-12N. Neither an EFB nor a conventional battery replaces the M40-12 SLD M.

### How much range does the MK Battery M40-12 SLD M give in an electric wheelchair?

It depends on weight, terrain and the chair. As a guide, with 45 Ah per battery an average chair covers several kilometres a day; range drops with hills and cold batteries.

## Other options if you are unsure about the M40-12 SLD M

- [All electric wheelchair batteries](https://bateriasonline.es/en/electric-wheelchair-batteries)
- [The whole MK Battery range](https://bateriasonline.es/en/mk-batteries)
- [Kronobat ES45-12](https://bateriasonline.es/en/kronobat-es45-12) · 45 Ah, 198×166×171 mm
- [Long WP45-12](https://bateriasonline.es/en/long-wp45-12) · 45 Ah, 199×166×171 mm

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