Spreader-Mate Charger

The Battery Tender® Plus (1.25A) is a fully automatic 12V smart charger and maintainer engineered to keep stored vehicles ready to start without the risk of overcharging. Unlike traditional trickle chargers that push continuous current and fry internal plates, its 4-stage Infinite Sequential Monitoring (ISM™) system automatically charges, tapers, and switches to a 24/7 float micro-current to eliminate battery-killing sulfation.

• True "Connect & Forget": Safe to leave plugged in all winter—never overcharges or boils electrolyte.

• Universal 12V Fit: Optimally sized for automotive, marine, and powersports batteries (14Ah to 80Ah) across Flooded, AGM, GEL, and Maintenance-Free chemistries.

• All-Weather Intelligent Charging: Automatically adjusts output voltage based on ambient garage temperature to guarantee a full charge in freezing cold or extreme heat.

• Total Garage Safety: Features spark-proof lead connections, reverse-polarity shutdown, short-circuit protection, and ETL certification.

• Key Features and Benefits

  • 1.25-amp charging output – suitable for maintaining 12V batteries.

  • Fully automatic operation – no manual switching between charging and maintenance.

  • Four-stage charging – initialization, bulk charging, absorption, and float maintenance.

  • Long-term battery maintenance – helps counteract natural self-discharge during storage.

  • AGM, flooded, and gel compatibility – supports common 12V lead-acid batteries.

  • Temperature compensation – adjusts charging voltage for ambient conditions.

  • Reverse-polarity protection – detects incorrect connections.

  • Spark-proof connection technology – improves connection safety.

  • Quick-connect accessories – supports convenient battery connections.

  • 10-year limited warranty – manufacturer-backed coverage.