CTEK SmartPass 120S – 12V Dual Battery Manager, AGM & Lead-Acid

Product Description

The CTEK SmartPass 120S is a professional-grade automatic charger and 12V dual battery manager designed for AGM and lead-acid systems. This automotive charger intelligently distributes charging current between starter and service batteries — purpose-built for Indian SUVs, trucks, and off-road rigs battling monsoons, heat, and voltage fluctuations. If you want to buy a dependable dual battery product that just works, this is it.

Features & Benefits

• 120A Pass-Through: Handles heavy electrical loads without voltage drop — ideal for commercial vehicles and power-hungry Indian rigs.
• Dual Battery Management: Protects both starter and service batteries simultaneously on long highway or Himalayan runs.
• AGM & Lead-Acid Compatible: Works with all common Indian vehicle battery types — no manual switching.
• Fully Automatic Operation: Set once; this automatic charger self-manages with zero user intervention.
• Wide Input Range (10.5–23V): Tolerates Indian alternator fluctuations and variable DC sources reliably.
• Reverse Polarity Protection: Guards against incorrect wiring — critical during roadside installations across India.
• Weatherproof Build: Rated to withstand India's humid monsoons and 45°C summer heat.

Detailed Specifications

How To Use

1. Mount the unit in a ventilated spot near your battery compartment.
2. Connect input terminals to your alternator or DC source (10.5–23V).
3. Wire output terminals to starter and service batteries respectively.
4. Power on — fully automatic charger operation begins immediately.

What's Included in the Box

• CTEK SmartPass 120S Unit
• Mounting hardware
• User manual

Comparison: CTEK SmartPass 120S – 12V Dual Battery Manager, AGM & Lead-Acid vs Generic Alternatives

Understanding the Technology

The SmartPass 120S uses priority charging logic — it ensures the starter battery reaches full charge before diverting surplus alternator current to the service battery. This DC-DC power distribution approach prevents parasitic drain and extends overall battery life. Unlike basic isolators, it dynamically responds to load demand without manual input. This makes it the preferred automotive charger solution for dual-battery setups in Indian expedition and overlanding vehicles.

Warranty & Support in India

• Warranty: 1-year warranty against manufacturing defects
• Customer Support: Monday–Saturday, 9 AM–6 PM IST. WhatsApp / Phone: +91 93112 11157 · hello@naredi.in
• Returns: 14-day return and exchange policy, COD returns accepted
• Delivery: Free delivery across India, Cash on Delivery available

Frequently Asked Questions

Yes — it works with any 12V AGM or lead-acid system, covering virtually all Indian SUVs, pickups, and commercial vehicles.

Absolutely — the wide 10.5–23V input range is specifically suited to the variable output common in Indian vehicle alternators.

Contact our support team via WhatsApp / Phone: +91 93112 11157 or hello@naredi.in Monday–Saturday, 9 AM–6 PM IST.

Yes — COD is available with free delivery to all pin codes across India.

The estimated lead time is 2 -3 days, but naredi.in or its affiliates are not responsible for delays or damages by courier. Any damages during transit need to be reported within 24 hours of receiving the shipment. We will try our best to help you resolve the issue.
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We have a 14-day return policy, which means you have 14 days after receiving your item to request a return. 
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