Sealed Maintenance Free N40 Car Battery 12V 40ah Automotive Battery Car Starting Mf Battery N40

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Product Description

📋 Basic Specifications
Model NO.
N40-MF
Charging Voltage
1.45V~1.5V
Working Voltage
1.5V~1.1V
Charging Type
Constant Voltage
Wet Shelf Life
5~8 Year
Discharging Type
Constant Resistance
Electrolyte
Acid Battery
Certification
ISO9001, RoHS, CE, Cash
Application
Car Starting/Solar/Street Light
Weight
12.0-13.0kgs
Transport Package
by Carton Box Then Onto Pallet
Specification
L240*W130*H200*TH220mm
Origin
China
HS Code
86072000
🚗 Product Overview

Sealed Maintenance Free N40 Car Battery 12V 40AH

Sealed Maintenance Free N40 Car Battery

MF batteries are sealed maintenance-free Calcium-Calcium batteries mainly used for starting vehicles and marines. These batteries are more popular than dry-charged batteries as they are much more convenient. These batteries have much better performance due to special technology, including the integration of silver into the battery plates.

Main Features
  • Sealed and Maintenance-free Operation
  • High Performance Computer-Designed Plate Grid enhances current flow pattern
  • High Quality and High Reliability with Exceptional Deep Discharge Recovery
  • Low Self-discharge and Long Service Life
  • Advanced C&F Technology (Container Formation for plates)
  • CE, UL, ISO9001 & ISO14001 Approved
🛠️ Advanced Battery Structure
Battery Structure

1. Radiation or Gridding Plates: Adopting advanced plate casters to produce much thicker plates with Pb-Ca-Sn alloy. This ensures complete maintenance-free performance and minimum self-discharge.

2. Separator: The super-thin glass fiber (or PE envelope) avoids short-circuiting and reduces electric resistance, increasing current capacity.

3. Poles: Made by mechanical operation to ensure no leakage, making them more durable than traditional versions.

4. Magic-Eye: Also known as an indicator, providing the real-time state of the battery charge.

5. PP Container: Features a special structure for excellent non-leakage and anti-explosion performance.

📦 Logistics & Production
Packing Photo
Factory View 1
Factory View 2
Factory View 3
Frequently Asked Questions
What is the main application for the N40-MF battery?
The N40-MF is designed primarily for starting Japanese cars, vans, and buses. It is also highly suitable for solar power storage, street lighting systems, and marine engine starting.
Does this battery require water refilling?
No, this is a Sealed Maintenance Free (SMF) battery. It utilizes Calcium-Calcium alloy technology and a heat-sealed cover to prevent electrolyte leakage and water loss, eliminating the need for maintenance.
What makes the "Magic-Eye" indicator useful?
The Magic-Eye acts as a built-in hydrometer. It allows users to check the battery's state of charge and electrolyte level at a glance without any testing equipment.
How does the battery handle vibrations and impact?
The battery uses a high-strength polypropylene (PP) casing and advanced PE enveloped separators. This design protects the internal active materials from dropping off during vibration, significantly extending component life.
What is the expected shelf life of this battery?
The wet shelf life of the N40-MF battery is approximately 5 to 8 years, depending on storage conditions and usage patterns.
Is the N40-MF battery safe from explosions?
Yes, it includes a frame arrester that prevents explosions caused by external sparks or gas accumulation during charging, while also containing any internal acid.

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