---
product_id: 68225798
title: "40-256 On-board Charger and Display"
brand: "ctek"
price: "€ 1188.31"
currency: EUR
in_stock: true
reviews_count: 4
url: https://www.desertcart.de/products/68225798-40-256-on-board-charger-and-display
store_origin: DE
region: Germany
---

# 140A max energy management IP65 splash & dust-proof Temperature-optimized charging 40-256 On-board Charger and Display

**Brand:** ctek
**Price:** € 1188.31
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up smarter, last longer — the charger that works as hard as you do!

## Quick Answers

- **What is this?** 40-256 On-board Charger and Display by ctek
- **How much does it cost?** € 1188.31 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/68225798-40-256-on-board-charger-and-display)

## Best For

- ctek enthusiasts

## Why This Product

- Trusted ctek brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact & Lightweight:** Sleek 1.8 kg form factor fits seamlessly onboard without bulk.
- • **Rugged IP65 Protection:** Splash-proof and dust-tight design built for the toughest environments.
- • **Smart Temperature Sensor:** Adaptive charging that thrives even in freezing conditions—never miss a charge.
- • **Maximized 140A Charging Power:** Unleash rapid, efficient energy flow to extend battery life and reliability.
- • **Precision AGM Voltage Control:** Switch effortlessly between 14.4V and 14.7V for peak battery performance.

## Overview

The CTEK 40-256 On-board Charger and Display is a high-performance 140A battery management system featuring adjustable AGM voltage modes (14.4V or 14.7V), a temperature sensor for optimized cold-weather charging, and an IP65-rated splash and dust-proof casing. Compact and lightweight at 1.8 kg, it delivers reliable, efficient charging tailored for professional-grade battery maintenance in demanding environments.

## Description

Full description not available

## Features

- Adjustable AGM mode: 14, 4V or 14.7V
- Maximized charging efficiency to increase battery power and battery life
- Temperature sensor to optimise charging in cold environments
- Splash-proof and dust-proof (IP65)
- The ultimate 140A energy management solution

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | CTEK |
| Brand | CTEK |
| Model | CTEK 20 Amp Off-Grid Ladesystem |
| Product Dimensions | 10.92 x 19.3 x 6.6 cm; 1.8 kg |
| Item model number | 40-256 |
| Exterior | Edited |
| Manufacturer part number | 40-256 |
| Lift type | nicht zutreffend |
| Item Weight | 1.8 kg |

## Product Details

- **Brand:** CTEK
- **Colour:** black
- **Item weight:** 1.8 Kilograms
- **Output voltage:** 12 Volts
- **Input voltage:** 14 Volts

## Images

![40-256 On-board Charger and Display - Image 1](https://m.media-amazon.com/images/I/61YisXTqHXL.jpg)

## Questions & Answers

**Q: How does the lcd display connect to the d250sa? is it via cable or bluetooth? thanks**
A: It is a device which works without the d250sa and has no connection to it. It is manufactured for CTEK by NASAMARINE (BM1 Compact). You connect it to the service battery and you can use it without the D250SA.

## Customer Reviews

### ⭐⭐⭐⭐⭐ High quality charger with add on LCD screen
*by A***N on 6 March 2021*

I have used these chargers before and they are very good, normally I would use the smart sensor to connect to my phone but decided on the LCD screen. Very easy to use but it is supplied with a non insulated shunt that needs to be covered in case anything falls across it. No cover supplied

### ⭐ This unit is NOT the later250SE Lithium battery version
*by C***. on 18 March 2024*

Beware this is not the later 250SE version but the earlier 250SA which is not compatible with Lithium batteries the description is wrong

### ⭐⭐⭐ No cables included!!
*by D***. on 12 December 2020*

After spending £440 on this product it would of been nice to have all of the required cables, leads, crimp connecters included!

## Frequently Bought Together

- CTEK 40-256 On-Board Charger and Display
- CTEK 56-382 Indicator eyelet M8: practical LED indicator for immediate indication of battery charge levels , Red/black
- CTEK 56 - 304 Connect 2.5M Extension extend the range of your charger

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**Shop now:** [https://www.desertcart.de/products/68225798-40-256-on-board-charger-and-display](https://www.desertcart.de/products/68225798-40-256-on-board-charger-and-display)

---

*Product available on Desertcart Germany*
*Store origin: DE*
*Last updated: 2026-02-04*