# MK Battery M50-12 SLD M · Electric wheelchair battery 12V 50Ah

![MK Battery M50-12 SLD M · Electric wheelchair battery 12V 50Ah](https://bateriasonline.es/3598-home_default/mk-battery-m50-12-sld-m.jpg)

> MK Battery M50-12 SLD M: 50 Ah electric wheelchair battery, 198.9×166.1×170.9 mm, AGM. Equivalent to Long WP50-12 and Long WP50-12N.

**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-m50-12-sld-m
- **Language**: en
- **Brand**: MK Battery
- **Reference**: BOL-MK-M50-12 SLD M
- **EAN**: 3660766448583
- **MPN**: M50-12 SLD M
- **Price**: 151,52 € (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 | 50 Ah |
| Length | 198.9 mm |
| Width | 166.1 mm |
| Height | 170.9 mm |
| Weight | 15.06 kg |
| Terminal type | M6 |

## Quick description

The MK Battery M50-12 SLD M is an electric wheelchair battery with 12 V and 50 Ah, measuring 198.9 × 166.1 × 170.9 mm.

## Description

## The MK Battery M50-12 SLD M at a glance

The MK Battery M50-12 SLD M is a deep-cycle battery for electric wheelchairs: sealed, maintenance-free and built to discharge and recharge every day without losing capacity. The M50-12 SLD M is fitted in pairs: two 12 V batteries in series give the chair's 24 V.
The M50-12 SLD M belongs to the MK Battery MK AGM range. [The full range of MK Battery batteries](https://bateriasonline.es/en/mk-batteries)

## Inside the M50-12 SLD M: AGM technology

The M50-12 SLD M is AGM: the electrolyte is absorbed in glass fibre mats, so it is sealed and spill-proof. It withstands many more cycles than a conventional lead battery, at the cost of being more sensitive to overcharging.

## MK Battery M50-12 SLD M vs M45-12 SLD M and ES40-12: which one to choose?

Torn between the M50-12 SLD M and another similar MK Battery? This is what changes:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| MK Battery M50-12 SLD M (this one) | 50 Ah | 198.9 × 166.1 × 170.9 | 15.06 kg |
| MK Battery M45-12 SLD M | 45 Ah | 198.9 × 166.1 × 170.9 | 14.47 kg |
| MK Battery ES40-12 | 45 Ah | 198.1 × 166.1 × 170.9 | 14.47 kg |

- MK Battery M45-12 SLD M: 5 Ah less, the same dimensions.
- MK Battery ES40-12: 5 Ah less, the same dimensions.

## Equivalents and alternatives to the MK Battery M50-12 SLD M

Other AGM batteries that fit the M50-12 SLD M's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Dimensions (mm) |
|---|---|---|---|
| Long WP50-12 | AGM | 50 Ah | 199 × 166 × 171 |
| Long WP50-12N | AGM | 50 Ah | 199 × 166 × 171 |
| Long WP50-12NE | AGM | 50 Ah | 199 × 166 × 171 |
| Kronobat ES50-12 | AGM | 50 Ah | 198 × 166 × 171 |
| Q-Battery 12LCP-50 | AGM | 50 Ah | 198 × 166 × 171 |
| MK Battery ES50-12 | AGM | 50 Ah | 198.9 × 166.1 × 170.9 |

## Part numbers and codes for the MK Battery M50-12 SLD M

The M50-12 SLD M is listed under these codes on labels, in garages and in catalogues:

| Commercial reference | M50-12 SLD M |
|---|---|
| EAN | 3660766448583 |
| Terminal type | M6 |
| Not to be confused with | MK Battery M20-12 SLD M (20 Ah), MK Battery M40-12 SLD M (45 Ah), MK Battery M55-12 SLD M (55 Ah) |

## What to look at before buying the M50-12 SLD M

- Your current battery should say about 50 Ah; a little more is also fine.
- Measure the space: the M50-12 SLD M takes up 198.9 × 166.1 × 170.9 mm.

## Frequently asked questions about the MK Battery M50-12 SLD M

### M50-12 SLD M or M45-12 SLD M: which one suits me?

Compared with the M50-12 SLD M, the MK Battery M45-12 SLD M has 5 Ah less. With 50 Ah, the M50-12 SLD M runs longer between charges than the M45-12 SLD M (45 Ah). Both measure 198.9 × 166.1 × 170.9 mm, so they fit the same tray.

### How much does the MK Battery M50-12 SLD M weigh?

15.06 kg, with 50 Ah of capacity. For reference, the MK Battery M45-12 SLD M (45 Ah) weighs 14.47 kg.

### Which battery is equivalent to the MK Battery M50-12 SLD M?

Only other AGM batteries with its dimensions and polarity: Long WP50-12, Long WP50-12N and Long WP50-12NE. Neither an EFB nor a conventional battery replaces the M50-12 SLD M.

### Do I have to replace both batteries at once?

Yes. Wheelchairs fit two batteries in series, and a new one next to a worn one becomes unbalanced and lasts much less.

## Keep comparing: alternatives to the M50-12 SLD M

- [Other electric wheelchair batteries](https://bateriasonline.es/en/electric-wheelchair-batteries)
- [Full MK Battery catalogue](https://bateriasonline.es/en/mk-batteries)
- [Long WP50-12](https://bateriasonline.es/en/long-wp50-12) · 50 Ah, 199×166×171 mm
- [Long WP50-12N](https://bateriasonline.es/en/long-wp50-12n) · 50 Ah, 199×166×171 mm

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