# MK Battery ES33-12 · Electric wheelchair battery 12V 35Ah

![MK Battery ES33-12 · Electric wheelchair battery 12V 35Ah](https://bateriasonline.es/3478-home_default/mk-battery-es33-12.jpg)

> MK Battery ES33-12: 35 Ah electric wheelchair battery, 196.1×130×180.1 mm, AGM. Equivalent to Ritar RA12-33 and Long U1-34H. 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-es33-12
- **Language**: en
- **Brand**: MK Battery
- **Reference**: BOL-MK-ES33-12
- **MPN**: ES33-12
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | MK Battery |
| Range | MK AGM |
| Application | Electric wheelchairs |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 35 Ah |
| Length | 196.1 mm |
| Width | 130 mm |
| Height | 180.1 mm |
| Weight | 10.48 kg |

## Quick description

MK Battery ES33-12: electric wheelchair battery with 12 V and 35 Ah, measuring 196.1 × 130 × 180.1 mm.

## Description

## The MK Battery ES33-12 at a glance

The MK Battery ES33-12 is a deep-cycle battery for electric wheelchairs: sealed, maintenance-free and built to discharge and recharge every day without losing capacity. With 35 Ah per battery, the ES33-12 is designed for a full charge every night.
The ES33-12 belongs to the MK Battery MK AGM range. [See all MK Battery batteries](https://bateriasonline.es/en/mk-batteries)

## Inside the ES33-12: AGM technology

The ES33-12 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.

## MK Battery ES33-12 vs MU-1 SLD M-33 and 8AU1H: differences

What sets the ES33-12 apart from its neighbours in the MK Battery range:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| MK Battery ES33-12 (this one) | 35 Ah | 196.1 × 130 × 180.1 | 10.48 kg |
| MK Battery MU-1 SLD M-33 | 33 Ah | 196.1 × 130 × 180.1 | 10.48 kg |
| MK Battery 8AU1H | 32 Ah | 213.6 × 131.6 × 183.4 | 10.43 kg |

- MK Battery MU-1 SLD M-33: 2 Ah less, the same dimensions.
- MK Battery 8AU1H: 3 Ah less, a different case (213.6 × 131.6 × 183.4 mm).

## Equivalents and alternatives to the MK Battery ES33-12

Other AGM batteries that fit the ES33-12's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Dimensions (mm) |
|---|---|---|---|
| Ritar RA12-33 | AGM | 35 Ah | 195 × 130 × 180 |
| Long U1-34H | AGM | 34 Ah | 197 × 131 × 180 |
| Long U1-34HE | AGM | 34 Ah | 197 × 131 × 180 |
| Long U1-36HE | AGM | 36 Ah | 197 × 131 × 180 |
| Kronobat ES34-12 | AGM | 34 Ah | 197 × 131 × 180 |
| Long U1-33H | AGM | 33 Ah | 197 × 131 × 180 |

## Part numbers and codes for the MK Battery ES33-12

The ES33-12 is listed under these codes on labels, in garages and in catalogues:

| Commercial reference | ES33-12 |
|---|---|
| Not to be confused with | MK Battery ES3-12 (3 Ah) |

## Before ordering the ES33-12, check this

- With 35 Ah, the ES33-12 replaces an original battery of that capacity or slightly less.
- Measure the space: the ES33-12 takes up 196.1 × 130 × 180.1 mm.

## Frequently asked questions about the MK Battery ES33-12

### ES33-12 or MU-1 SLD M-33: which one suits me?

Compared with the ES33-12, the MK Battery MU-1 SLD M-33 has 2 Ah less. With 35 Ah, the ES33-12 runs longer between charges than the MU-1 SLD M-33 (33 Ah). Both measure 196.1 × 130 × 180.1 mm, so they fit the same tray.

### How much does the MK Battery ES33-12 weigh?

10.48 kg, with 35 Ah of capacity. For reference, the MK Battery MU-1 SLD M-33 (33 Ah) weighs 10.48 kg.

### Which battery is equivalent to the MK Battery ES33-12?

Only other AGM batteries with its dimensions and polarity: Ritar RA12-33, Long U1-34H and Long U1-34HE. Neither an EFB nor a conventional battery replaces the ES33-12.

### 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.

## More batteries to compare with the ES33-12

- [All electric wheelchair batteries](https://bateriasonline.es/en/electric-wheelchair-batteries)
- [The whole MK Battery range](https://bateriasonline.es/en/mk-batteries)
- [Ritar RA12-33](https://bateriasonline.es/en/ritar-ra12-33) · 35 Ah, 195×130×180 mm
- [Long U1-34H](https://bateriasonline.es/en/long-u1-34h) · 34 Ah, 197×131×180 mm

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*bateriasonline.es — Batteries and accessories · 2026-11-10*