# MK Battery ES40-12 · Electric wheelchair battery 12V 45Ah

![MK Battery ES40-12 · Electric wheelchair battery 12V 45Ah](https://bateriasonline.es/3490-home_default/mk-battery-es40-12.jpg)

> MK Battery ES40-12: 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-es40-12
- **Language**: en
- **Brand**: MK Battery
- **Reference**: BOL-MK-ES40-12
- **MPN**: ES40-12
- **Last updated**: 2026-11-06

## 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 ES40-12: electric wheelchair battery with 12 V and 45 Ah, measuring 198.1 × 166.1 × 170.9 mm.

## Description

## Where the MK Battery ES40-12 fits

The MK Battery ES40-12 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 ES40-12 is designed for a full charge every night.
The ES40-12 belongs to the MK Battery MK AGM range. [The full range of MK Battery batteries](https://bateriasonline.es/en/mk-batteries)

## Equivalents and alternatives to the MK Battery ES40-12

As the ES40-12 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 ES40-12 vs ES50-12 and M50-12 SLD M

The real differences between the ES40-12 and the closest MK Battery models:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| MK Battery ES40-12 (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 ES40-12

The ES40-12 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.

## Before ordering the ES40-12, check this

- Length, width and height of the ES40-12: 198.1 × 166.1 × 170.9 mm.
- With 45 Ah, the ES40-12 replaces an original battery of that capacity or slightly less.

## MK Battery ES40-12 codes and part numbers

The ES40-12 is listed under these codes on labels, in garages and in catalogues:

| Commercial reference | ES40-12 |
|---|---|
| Not to be confused with | MK Battery ES50-12 (50 Ah) |

## Frequently asked questions about the MK Battery ES40-12

### MK Battery ES40-12 or ES50-12?

Compared with the ES40-12, the MK Battery ES50-12 has 5 Ah more. With 50 Ah, the ES50-12 runs longer between charges than the ES40-12 (45 Ah). Both measure 198.1 × 166.1 × 170.9 mm, so they fit the same tray.

### How much does the MK Battery ES40-12 weigh?

The ES40-12 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 ES40-12?

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 ES40-12.

### Which charger does the MK Battery ES40-12 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.

## More batteries to compare with the ES40-12

- [All electric wheelchair batteries](https://bateriasonline.es/en/electric-wheelchair-batteries)
- [Full MK Battery catalogue](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 · 2026-11-10*