# Deka 8G40 · Electric wheelchair battery 12V 40Ah

![Deka 8G40 · Electric wheelchair battery 12V 40Ah](https://bateriasonline.es/3825-home_default/deka-8g40.jpg)

> Deka 8G40: 40 Ah electric wheelchair battery, 197.1×168.1×174.8 mm, GEL. Equivalent to MK Battery 8G40 and MK Battery M40-12 SLD G.

**Category:** [Electric wheelchair batteries](https://bateriasonline.es/en/electric-wheelchair-batteries) → [Deka](https://bateriasonline.es/en/deka-batteries)

- **Canonical URL**: https://bateriasonline.es/en/deka-8g40
- **Language**: en
- **Brand**: Deka
- **Reference**: BOL-DEKA-8G40
- **MPN**: 8G40
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Deka |
| Range | DEKA GEL |
| Application | Electric wheelchairs |
| Technology | GEL |
| Voltage | 12 V |
| Capacity | 40 Ah |
| Length | 197.1 mm |
| Width | 168.1 mm |
| Height | 174.8 mm |
| Weight | 14.29 kg |

## Quick description

Deka 8G40: electric wheelchair battery with 12 V and 40 Ah, measuring 197.1 × 168.1 × 174.8 mm.

## Description

## The Deka 8G40 at a glance

The Deka 8G40 is a deep-cycle battery for electric wheelchairs: sealed, maintenance-free and built to discharge and recharge every day without losing capacity. The 8G40 is fitted in pairs: two 12 V batteries in series give the chair's 24 V.
The 8G40 belongs to the Deka DEKA GEL range. [The full range of Deka batteries](https://bateriasonline.es/en/deka-batteries)

## Equivalents and alternatives to the Deka 8G40

Other gel batteries with the dimensions and polarity of the 8G40: with gel it is best to stay with gel, because the charging profile is different.

| Model | Technology | Capacity | Dimensions (mm) |
|---|---|---|---|
| MK Battery 8G40 | GEL | 40 Ah | 197.1 × 168.1 × 174.8 |
| MK Battery M40-12 SLD G | GEL | 40 Ah | 197.1 × 168.1 × 174.8 |
| Long LG40-12 | GEL | 40 Ah | 199 × 166 × 171 |
| Long LG40-12N | GEL | 40 Ah | 199 × 166 × 171 |

## Deka 8G40 vs 8GU1 and 8G22NF: which one to choose?

What sets the 8G40 apart from its neighbours in the Deka range:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| Deka 8G40 (this one) | 40 Ah | 197.1 × 168.1 × 174.8 | 14.29 kg |
| Deka 8GU1 | 31.6 Ah | 195.8 × 131.6 × 183.4 | 10.66 kg |
| Deka 8G22NF | 51 Ah | 228.3 × 138.9 × 235.2 | 17.01 kg |

- Deka 8GU1: 8.40 Ah less, a different case (195.8 × 131.6 × 183.4 mm).
- Deka 8G22NF: 11 Ah more, a different case (228.3 × 138.9 × 235.2 mm).

## GEL technology in the 8G40

The 8G40 is a gel battery: the electrolyte is immobilised in silica gel. The 8G40 handles repeated deep discharges well, its strong point compared with an AGM.

## Before ordering the 8G40, check this

- Measure the space: the 8G40 takes up 197.1 × 168.1 × 174.8 mm.
- Your current battery should say about 40 Ah; a little more is also fine.

## Frequently asked questions about the Deka 8G40

### Deka 8G40 or 8GU1?

Compared with the 8G40, the Deka 8GU1 has 8.40 Ah less. With 40 Ah, the 8G40 runs longer between charges than the 8GU1 (31.6 Ah). Mind the space: the 8GU1 measures 195.8 × 131.6 × 183.4 mm.

### How much does the Deka 8G40 weigh?

The 8G40 weighs 14.29 kg. For reference, the Deka 8GU1 (31.6 Ah) weighs 10.66 kg.

### Which battery is equivalent to the Deka 8G40?

For the 8G40, other gel batteries with its size and polarity: MK Battery 8G40, MK Battery M40-12 SLD G and Long LG40-12.

### Which charger does the Deka 8G40 need?

A charger with a GEL mode not exceeding 14.1-14.4 V. Charging it with a conventional lead-acid profile damages it through overcharging.

## Keep comparing: alternatives to the 8G40

- [Other electric wheelchair batteries](https://bateriasonline.es/en/electric-wheelchair-batteries)
- [The whole Deka range](https://bateriasonline.es/en/deka-batteries)
- [MK Battery 8G40](https://bateriasonline.es/en/mk-battery-8g40) · 40 Ah, 197.1×168.1×174.8 mm
- [MK Battery M40-12 SLD G](https://bateriasonline.es/en/mk-battery-m40-12-sld-g) · 40 Ah, 197.1×168.1×174.8 mm

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