# MK Battery ES17-12S · Electric wheelchair battery 12V 18Ah

![MK Battery ES17-12S · Electric wheelchair battery 12V 18Ah](https://bateriasonline.es/2899-home_default/mk-battery-es17-12s.jpg)

> MK Battery ES17-12S: 18 Ah electric wheelchair battery, 181.1×75.9×166.9 mm, AGM. Equivalent to Long WP18-12 and Long WP18-12I. Ask for a no-obligation quote.

**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-es17-12s
- **Language**: en
- **Brand**: MK Battery
- **Reference**: BOL-MK-ES17-12S
- **MPN**: ES17-12S
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | MK Battery |
| Range | MK AGM |
| Application | Electric wheelchairs |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 18 Ah |
| Length | 181.1 mm |
| Width | 75.9 mm |
| Height | 166.9 mm |
| Weight | 5.85 kg |

## Quick description

The MK Battery ES17-12S is an electric wheelchair battery with 12 V and 18 Ah, measuring 181.1 × 75.9 × 166.9 mm.

## Description

## Who the MK Battery ES17-12S is for

The MK Battery ES17-12S is a deep-cycle battery for electric wheelchairs: sealed, maintenance-free and built to discharge and recharge every day without losing capacity. The ES17-12S is fitted in pairs: two 12 V batteries in series give the chair's 24 V.
The ES17-12S belongs to the MK Battery MK AGM range. [More MK Battery batteries](https://bateriasonline.es/en/mk-batteries)

## AGM technology in the ES17-12S

The ES17-12S is AGM: the electrolyte is absorbed in glass fibre mats, so it is sealed and spill-proof. Being sealed, the ES17-12S can be fitted in the boot or under a seat with no risk of spills.

## MK Battery ES17-12S vs ES20-12C and ES20-12C FT: which one to choose?

Torn between the ES17-12S and another similar MK Battery? This is what changes:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| MK Battery ES17-12S (this one) | 18 Ah | 181.1 × 75.9 × 166.9 | 5.85 kg |
| MK Battery ES20-12C | 20 Ah | 181.1 × 75.9 × 166.9 | 5.94 kg |
| MK Battery ES20-12C FT | 20 Ah | 181.1 × 75.9 × 166.9 | 5.94 kg |

- MK Battery ES20-12C: 2 Ah more, the same dimensions.
- MK Battery ES20-12C FT: 2 Ah more, the same dimensions.

## Equivalents and alternatives to the MK Battery ES17-12S

As the ES17-12S 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 WP18-12 | AGM | 18 Ah | 181 × 76 × 167 |
| Long WP18-12I | AGM | 18 Ah | 181 × 76 × 167 |
| Long WP18-12N | AGM | 18 Ah | 181 × 76 × 167 |
| Long WP18-12U | AGM | 18 Ah | 181 × 76 × 167 |
| Kronobat ES17-12 | AGM | 18 Ah | 181 × 76 × 167 |
| Q-Battery 12LCP-19 | AGM | 19 Ah | 181 × 77 × 167 |

## MK Battery ES17-12S codes and part numbers

Look for any of these ES17-12S codes on your current battery or in the manufacturer's catalogue:

| Commercial reference | ES17-12S |
|---|---|
| Not to be confused with | MK Battery ES10-12S (10 Ah) |

## Before ordering the ES17-12S, check this

- With 18 Ah, the ES17-12S replaces an original battery of that capacity or slightly less.
- The ES17-12S needs 181.1 × 75.9 × 166.9 mm of space: measure it with the hold-down clamp in place.

## Frequently asked questions about the MK Battery ES17-12S

### MK Battery ES17-12S or ES20-12C?

Compared with the ES17-12S, the MK Battery ES20-12C has 2 Ah more. With 20 Ah, the ES20-12C runs longer between charges than the ES17-12S (18 Ah). Both measure 181.1 × 75.9 × 166.9 mm, so they fit the same tray.

### How much does the MK Battery ES17-12S weigh?

The ES17-12S weighs 5.85 kg. For reference, the MK Battery ES20-12C (20 Ah) weighs 5.94 kg.

### Which battery is equivalent to the MK Battery ES17-12S?

Only other AGM batteries with its dimensions and polarity: Long WP18-12, Long WP18-12I and Long WP18-12N. Neither an EFB nor a conventional battery replaces the ES17-12S.

### Which charger does the MK Battery ES17-12S 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 ES17-12S

- [Other electric wheelchair batteries](https://bateriasonline.es/en/electric-wheelchair-batteries)
- [More MK Battery models](https://bateriasonline.es/en/mk-batteries)
- [Long WP18-12](https://bateriasonline.es/en/long-wp18-12) · 18 Ah, 181×76×167 mm
- [Long WP18-12I](https://bateriasonline.es/en/long-wp18-12i) · 18 Ah, 181×76×167 mm

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