Battery Tender® Plus 12V 1.25 Amp IP65

Standard battery maintainers assume you will connect and disconnect them. Permanent installation — in an engine bay, under a fairing, in a trailer compartment, or in a storage structure — demands something different: a charger that stays connected, withstands the environment, and operates without intervention for months at a time. The Battery Tender® Plus 12V 1.25A IP65 is built for exactly that application: IP65-rated weather resistance, ring terminal harness for permanent battery connection, and Battery Tender®'s ISM (Infinite Sequential Monitoring™) algorithm to ensure the battery is never overcharged and never left to sulfate.

IP65 Weather Resistance for Permanent Installations

IP65 certification provides complete dust protection and resistance to water jets from any direction. The Battery Tender® Plus IP65 withstands rain, spray, condensation, splash, and the temperature cycling of outdoor and semi-exposed storage environments without damage or interruption of charging. For installations in engine compartments, under fairings, or in outdoor equipment bays where water exposure is unavoidable, IP65 protection ensures continuous operation through all conditions.

Ring Terminal Harness — Always Connected

The Battery Tender® Plus IP65 ships with a ring terminal harness that mounts permanently to the battery terminals. The charger connects to the harness via quick-disconnect, eliminating the need to open battery compartments or handle clamps at each charging session. Once the harness is installed, connecting the charger takes seconds. For long-term storage, the charger can remain connected to the harness indefinitely — the ISM algorithm manages the full charging sequence and transitions to float maintenance automatically.

ISM: 4-Stage Intelligent Charging

• Initialization — Battery health check and polarity confirmation before current flows
• Bulk Charge — Full 1.25 Amp output restores depleted capacity to the battery's rated level
• Absorption — Current tapers automatically as the battery approaches 100% charge, preventing heat buildup, gassing, and overcharge damage
• Float Maintenance — Precisely regulated micro-current delivered 24/7 holds battery at peak voltage indefinitely, offsetting natural self-discharge without overcharging

Compatible battery size range: 14Ah to 80Ah at 12V. All lead-acid chemistries: flooded, AGM, gel cell, and sealed maintenance-free.

Permanent Installation Applications

• Motorcycles with permanent ring terminal harness installations
• ATVs and UTVs stored outdoors in equipment sheds
• Boats with battery access limitations in engine compartments or bilge areas
• Trailers and RVs on long-term or seasonal storage
• Classic and collector vehicles where battery compartment access is restricted
• Fleet vehicles with standardized terminal harness installations
• Any vehicle where ease and speed of connection is a priority for seasonal storage management

The Storage Season Workflow

With a permanent ring terminal harness installed, the process is: connect the quick-disconnect when the vehicle enters storage. Leave it connected for the duration. Disconnect when the vehicle returns to service. ISM manages the full charging sequence, transitions to float maintenance automatically, and holds the battery at peak capacity throughout the entire storage period — regardless of duration. No manual checks, no timed charging sessions, no concern about overcharging.

Automatic Temperature Compensation

Ambient temperature directly affects optimal charge voltage for lead-acid batteries. Cold reduces electrolyte conductivity and requires higher voltage to achieve full charge; heat accelerates overcharge risk. The Battery Tender® Plus IP65 automatically adjusts charge voltage based on ambient temperature throughout the charging cycle — delivering the correct voltage whether the vehicle is stored in a heated building or exposed to winter outdoor temperatures — without manual adjustment at any point.

Safety Features

• Spark-proof ring terminal connection — No current flows through the harness until the quick-disconnect is confirmed; eliminates connection sparks in enclosed engine compartments
• Reverse polarity protection — Protects vehicle electronics and wiring harnesses from incorrect connections
• Short-circuit protection — Automatic fault detection and shutdown
• ETL and CETL certified

Permanent Connection. Permanent Protection Against Sulfation.

Sulfation — the permanent, irreversible hardening of lead sulfate on battery plates — is the primary cause of battery failure during storage. A battery that sits disconnected loses voltage continuously; once voltage drops below the threshold for sulfation formation, crystal growth begins and no subsequent charging can reverse it. The Battery Tender® Plus IP65, left connected via ring terminal harness, maintains continuous float voltage from storage entry through retrieval. Sulfation never forms. Battery life consistently extends from 2–3 years to 5 years or more.

5-Year Limited Warranty | DeLand, Florida Since 1965