---
product_id: 68225798
title: "CTEK 40-256 On-board Charger and Display"
brand: "ctek"
price: "$1344.60"
currency: USD
in_stock: true
category: "Ctek"
url: https://www.desertcart.us/products/68225798-ctek-40-256-on-board-charger-and-display
store_origin: US
region: United States of America
---

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

**Brand:** ctek
**Price:** $1344.60
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** CTEK 40-256 On-board Charger and Display by ctek
- **How much does it cost?** $1344.60 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/68225798-ctek-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

Buy CTEK 40-256 On-board Charger and Display at desertcart UK. Free delivery on eligible orders.

## 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 |
|---------------|-------|
| ASIN | B07D7LTLZR |
| Best Sellers Rank | 1,016,660 in Automotive ( See Top 100 in Automotive ) 2,599 in Car Battery Charging Units |
| Box Contents | On-board charger; spared display; user guide |
| Brand Name | CTEK |
| Colour | black |
| Country of Origin | China |
| Current Rating | 20 Amps |
| Customer Reviews | 3.5 3.5 out of 5 stars (13) |
| Global Trade Identification Number | 07340103402565 |
| Input Voltage | 14 Volts |
| Item Type Name | 20A off-grid charging system: on-board charger and display for charging the additional battery while driving |
| Item Weight | 1.8 Kilograms |
| Manufacturer | CTEK |
| Manufacturer Part Number | 40-256 |
| Model Number | 40-256 |
| Output Voltage | 12 Volts |
| Product Warranty | 2 Year |

## Product Details

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

## Images

![CTEK 40-256 On-board Charger and Display - Image 1](https://m.media-amazon.com/images/I/61YisXTqHXL.jpg)
![CTEK 40-256 On-board Charger and Display - Image 2](https://m.media-amazon.com/images/I/61V1eOFU0YL.jpg)
![CTEK 40-256 On-board Charger and Display - Image 3](https://m.media-amazon.com/images/I/71bYt4nebTL.jpg)
![CTEK 40-256 On-board Charger and Display - Image 4](https://m.media-amazon.com/images/I/61uemfr3rGL.jpg)
![CTEK 40-256 On-board Charger and Display - Image 5](https://m.media-amazon.com/images/I/61OV4BVEYtL.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.

## 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.us/products/68225798-ctek-40-256-on-board-charger-and-display](https://www.desertcart.us/products/68225798-ctek-40-256-on-board-charger-and-display)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-08*