# MK Battery M20-12 SLD M · Electric wheelchair battery 12V 20Ah

![MK Battery M20-12 SLD M · Electric wheelchair battery 12V 20Ah](https://bateriasonline.es/3565-home_default/mk-battery-m20-12-sld-m.jpg)

> MK Battery M20-12 SLD M: 20 Ah electric wheelchair battery, 181.1×75.9×166.9 mm, AGM. Equivalent to Long WP20-12 and Long WP20-12I.

**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-m20-12-sld-m
- **Language**: en
- **Brand**: MK Battery
- **Reference**: BOL-MK-M20-12 SLD M
- **MPN**: M20-12 SLD M
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | MK Battery |
| Range | MK AGM |
| Application | Electric wheelchairs |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 20 Ah |
| Length | 181.1 mm |
| Width | 75.9 mm |
| Height | 166.9 mm |
| Weight | 6.04 kg |

## Quick description

The MK Battery M20-12 SLD M is an electric wheelchair battery with 12 V and 20 Ah, measuring 181.1 × 75.9 × 166.9 mm.

## Description

## Who the MK Battery M20-12 SLD M is for

The MK Battery M20-12 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 M20-12 SLD M is fitted in pairs: two 12 V batteries in series give the chair's 24 V.
The M20-12 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 M20-12 SLD M: AGM technology

The M20-12 SLD M is AGM: the electrolyte is absorbed in glass fibre mats, so it is sealed and spill-proof. Being sealed, the M20-12 SLD M can be fitted in the boot or under a seat with no risk of spills.

## MK Battery M20-12 SLD M vs ES17-12 and ES17-12S

Torn between the M20-12 SLD M and another similar MK Battery? This is what changes:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| MK Battery M20-12 SLD M (this one) | 20 Ah | 181.1 × 75.9 × 166.9 | 6.04 kg |
| MK Battery ES17-12 | 18 Ah | 181.1 × 75.9 × 166.9 | 5.85 kg |
| MK Battery ES17-12S | 18 Ah | 181.1 × 75.9 × 166.9 | 5.85 kg |

- MK Battery ES17-12: 2 Ah less, the same dimensions.
- MK Battery ES17-12S: 2 Ah less, the same dimensions.

## Equivalents and alternatives to the MK Battery M20-12 SLD M

As the M20-12 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) |
|---|---|---|---|
| Long WP20-12 | AGM | 20 Ah | 181 × 76 × 167 |
| Long WP20-12I | AGM | 20 Ah | 181 × 76 × 167 |
| Long WP20-12N | AGM | 20 Ah | 181 × 76 × 167 |
| Long WP20-12U | AGM | 20 Ah | 181 × 76 × 167 |
| Long WP20-12IE | AGM | 20 Ah | 181 × 76 × 167 |
| Kronobat ES20-12CFT | AGM | 20 Ah | 181 × 76 × 167 |

## MK Battery M20-12 SLD M codes and part numbers

Look for any of these M20-12 SLD M codes on your current battery or in the manufacturer's catalogue:

| Commercial reference | M20-12 SLD M |
|---|---|
| Not to be confused with | MK Battery M40-12 SLD M (45 Ah), MK Battery M50-12 SLD M (50 Ah) |

## Check this before ordering the MK Battery M20-12 SLD M

- With 20 Ah, the M20-12 SLD M replaces an original battery of that capacity or slightly less.
- Length, width and height of the M20-12 SLD M: 181.1 × 75.9 × 166.9 mm.

## Frequently asked questions about the MK Battery M20-12 SLD M

### MK Battery M20-12 SLD M or ES17-12?

Compared with the M20-12 SLD M, the MK Battery ES17-12 has 2 Ah less. With 20 Ah, the M20-12 SLD M runs longer between charges than the ES17-12 (18 Ah). Both measure 181.1 × 75.9 × 166.9 mm, so they fit the same tray.

### How much does the MK Battery M20-12 SLD M weigh?

The M20-12 SLD M weighs 6.04 kg. For reference, the MK Battery ES17-12 (18 Ah) weighs 5.85 kg.

### Which battery is equivalent to the MK Battery M20-12 SLD M?

Only other AGM batteries with its dimensions and polarity: Long WP20-12, Long WP20-12I and Long WP20-12N. Neither an EFB nor a conventional battery replaces the M20-12 SLD M.

### Which charger does the MK Battery M20-12 SLD M need?

A charger with an AGM mode that limits voltage to about 14.4-14.7 V. Never an old unregulated charger: overcharging dries out an AGM beyond repair.

## Keep comparing: alternatives to the M20-12 SLD M

- [Other electric wheelchair batteries](https://bateriasonline.es/en/electric-wheelchair-batteries)
- [Full MK Battery catalogue](https://bateriasonline.es/en/mk-batteries)
- [Long WP20-12](https://bateriasonline.es/en/long-wp20-12) · 20 Ah, 181×76×167 mm
- [Long WP20-12I](https://bateriasonline.es/en/long-wp20-12i) · 20 Ah, 181×76×167 mm

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