120Ah Slimline Deep Cycle Lithium Iron Phosphate Battery – Bluetooth Enabled | DCS

Engineered for Tight Spaces. Built for Harsh Conditions. Designed for Peak Performance.

The all-new 2024 DCS 120Ah Slimline LFP Battery delivers cutting-edge energy storage in a compact, space-saving form factor under 2 inches thick. Designed with the latest cylindrical cell pack technology and sealed in a thermal interface resin, this battery is optimized for extreme heat, vibration, and high-load mobile power demands.

Whether you're powering a camper van, overland rig, marine vessel, or off-grid system, the DCS Slimline 120Ah Battery provides unmatched durability, performance, and Bluetooth-enabled insights via the DCS Smart Battery App.

 

 

Key Features

• Ultra-Slim Design: Just 1.96” thick—ideal for tight install locations in vans, 4x4s, and RVs.

• Bluetooth 4.0 App Monitoring: View voltage, state of charge, current draw, remaining time, cell balancing, and more—all from your phone.

• DCS 3S 160A BMS + CMS: Proprietary high-performance Battery Management System + stand-alone 16-channel Active Cell Balancer for optimal longevity and protection.

• Thermal Interface Resin: Fully encapsulated for superior thermal management, vibration resistance, and extended cycle life.

• Heavy-Duty Slimline Construction: Laser-welded aluminum shell with internal copper bus bars—serviceable after warranty.

• Extreme Discharge Capability: A Single battery Supports up to a 2000W inverter; engine starting capable with 1000 LCA.

• 5-Year Warranty: Backed by rigorous MIL-STD-810G vibration testing and real-world outback testing.

 

 

Technical Specifications

• Nominal Voltage: 12V

• Nominal Capacity: 120Ah

• Dimensions: 27.165" x 1.968" x 11.811"

• Weight: 47.3 lbs

• Terminal Type: Dual Anderson Connectors (bridged with internal copper busbars)

• Cell Type: Cylindrical LFP Cells – 3.2V (15Ah)

• Chemistry: Lithium Ferro Phosphate (LFP)

• Cycle Life: 4000 Cycles @ 100% DOD (to 80% capacity at 77°F)

• Max Charge Voltage: 14.6V

• Recommended Charge Current: ≤ 80A

• Max Charge Current: ≤ 120A

• Max Discharge Current: ≤ 160A

• Cranking Amps: 1000 LCA

• Ingress Protection: IP54

• BMS Type: DCS 3S 160A with full short circuit, overcharge, over-discharge, and thermal protection

 

 

Why Choose the DCS 120Ah Slimline Battery?

Slim Profile, Big Power
The narrowest high-performance LFP battery on the market—perfect for stealth installations and space-constrained builds.

Bluetooth-Enabled Smart Monitoring
Track performance in real-time via the DCS app—no guesswork, no external shunts needed.

Serviceable & Future-Proof
Durable aluminum housing and repairable design means long-term value well beyond the 5-year warranty.

Parallel-Ready Design
Twin Anderson terminals make parallel setups cleaner and faster with better cable management.

 

 

Advanced Engineering Highlights

• Encapsulated in Thermal Resin: Increases heat dissipation, vibration tolerance, and longevity.

• Laser-Welded Pack & Copper Bus Bars: Industrial-grade strength and energy transfer.

• Active Cell Balancing: Ensures safe, efficient charging and longer life span.

• MIL-Spec Tested: Built to endure the harshest off-road conditions.

 

 

Ideal For:

• Camper Vans, RVs & Overland Rigs

• Marine & Off-Grid Systems

• 12V DIY Powerwalls & Mobile Workshops

• Systems with high-load appliances or 2000W inverters

• Engine start or hybrid power applications

 

 

Important Notes:

• Bluetooth App monitoring is included.

• For safety and performance, always install per system requirements.

• Includes:

  • (2) Anderson Connector Cables

  • (4) Wall Mounting Brackets

  • (1) 5-Year Manufacturer Warranty

 

 

Frequently Asked Questions – DCS Lithium Batteries

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What happens if I completely discharge my DCS battery?

If a DCS LFP battery is fully depleted, the Battery Management System (BMS) will activate a protective shutdown by opening the battery terminals. This removes resistance in the system and prevents damage to the cells.

To wake up the battery:

• The BMS requires a 12V signal with at least 1A of current to "wake up."

• Most modern lithium-compatible chargers and solar regulators will initiate a slow recovery charge to wake the BMS.

• If your charger cannot wake the BMS, connect an unregulated solar panel directly to the battery terminals (ensure all loads are disconnected).

Important: The battery should never be left in a fully discharged state as this will result in irreversible cell damage. Always integrate a low-voltage cutoff system to prevent full discharge and follow the storage procedures in the user guide.

 

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What is Active Cell Management?

DCS batteries use Active Cell Balancing, a method that redistributes charge among individual cells during charge and discharge cycles. This ensures:

• Maximized available energy

• Increased battery lifespan

• Reduced risk of thermal runaway and cell degradation

Unlike passive balancing, which dissipates excess energy as heat, active balancing efficiently moves charge from high to low cells in real time.

 

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What is the best way to store my DCS battery?

For long-term storage:

1. Fully charge the battery to 100%.

2. Disconnect all loads and chargers.

3. Store for a maximum of 3 months.

4. Perform a full discharge and recharge cycle every 3 months (at least 4 cycles per year) to maintain cell health.

 

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What battery monitor settings should I use?

Use these settings when configuring external battery monitors:

• Charged voltage: 14.0V

• Tail current: 4%

• Charged detection time: 1 minute

• Peukert exponent: 1.05

• Charge efficiency: 98%

• Current threshold: 0.1A

• C-rate: Based on your battery’s capacity (e.g., 1C for 100Ah = 100A)

 

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Can I use a voltage-sensing relay (VSR) between different battery chemistries or capacities?

No. VSRs connect batteries in parallel, which can cause:

• Uneven charging

• Accelerated degradation of both batteries

For example, pairing a 60Ah lead-acid battery with a 120Ah AGM or lithium battery via VSR will damage both packs over time.

Solution: Use a DC-DC charger, which isolates the two systems while safely transferring energy from the starter to the auxiliary battery, regardless of chemistry or size.

 

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If both batteries are identical, can I use a VSR?

Yes, but lithium batteries have a unique voltage curve. You must use a programmable VSR to dial in the correct parameters.

Alternative: For simplicity and efficiency, connect the batteries in parallel and use a load disconnect (e.g., Victron Smart Battery Protect) to safeguard against over-discharge instead of relying on a VSR.