OptiMate DC DUO - Battery-to-Battery Charger & Maintainer

The OptiMate DC DUO TM500 V3 is a DC-to-DC smart charger and maintainer, designed to safely charge and maintain a second 12V battery from a primary 12V power source (such as another battery, solar-charged battery, or vehicle). With 2A of charge current and dual chemistry support (lead-acid and lithium), it's perfect for trailers, off-grid setups, dual-battery 4x4s, and boats.

This charger automatically detects the battery type and applies a multi-stage charging and maintenance cycle. Its passive mode consumes less than 0.5 mA and includes automatic shut-off when the source voltage drops too low - making it the safest way to maintain a battery from any 12 V supply.

Features & Benefits

• DC-to-DC battery charger - Charges a 12 V battery from another 12 V power source
• Re-activates battery from sleep or deep discharge protection mode
• 2A charging current
• Supports lead-acid and LiFePO - Auto-detects and applies correct charge profile
• 6-step smart program
• Low power consumption - Uses <0.5 mA in standby; automatic shut-off protects source battery
• Discharge Protection - Protects source from total discharge
• No AC needed - Works in mobile, off-grid, and solar systems
• Green Technology - Built-in energy-saving technology
• Electronics-safe - Spark-free, overcharge and short-circuit protection
• Weatherproof & compact - Mountable for vehicle or outdoor use

Warranty

• 3-year limited replacement warranty

What's in the box
1 x OptiMate DC DUO TM500 V3 Charger
2 x SAE output/input cables
1 x O-01 battery lead with ring terminals
1 x O-04 battery clip lead
1 x Instruction manual