Battery Tender Plus 1.25 AMP 12V Battery Charger and Maintainer

If you own a car, truck, motorcycle, boat, or any vehicle that sits unused for weeks, the Battery Tender® Plus is the answer. America's most trusted smart battery charger and maintainer — backed by a 10-Year Limited Warranty that no competitor in the industry matches — built by the company that invented the modern battery maintainer in DeLand, Florida in 1965.

Built for Cars. Safe for Everything.

The Battery Tender® Plus 1.25 Amp is engineered for automotive batteries up to 80Ah — the correct size for most passenger cars, compact SUVs, pickup trucks, and light commercial vehicles. At 1.25 Amp, it charges automotive batteries efficiently without the heat risk of higher-output chargers, and ISM (Infinite Sequential Monitoring™) ensures it never overcharges regardless of how long it remains connected. It is equally safe for smaller powersports batteries, making it the single charger for every vehicle in your garage.

Why the Plus Beats Every Trickle Charger — and Most Smart Chargers

Standard trickle chargers deliver constant current regardless of battery state. Connected to a fully charged battery for two weeks, a trickle charger will overcharge it — producing heat, excessive gassing, electrolyte loss, and accelerated plate corrosion that permanently reduces capacity. Battery Tender®'s ISM eliminates this entirely:

• Initialization — Checks battery health and confirms correct polarity before any current flows; identifies battery condition and detects faults before charging begins
• Bulk Charge — Full 1.25 Amp output efficiently restores depleted capacity to the battery's rated level
• Absorption — As the battery approaches 100% charge, current automatically tapers to prevent heat buildup, gassing, and overcharge damage to the plates
• Float Maintenance — Precisely regulated micro-current is delivered 24/7, offsetting the battery's natural self-discharge rate and holding it at peak voltage indefinitely — without overcharging

Once connected, the Battery Tender® Plus requires no further attention. Leave it connected for a weekend, a month, or an entire winter — the battery will be at 100% when you return.

Battery Chemistry Compatibility

• Flooded (wet cell) — Conventional automotive batteries
• AGM (Absorbent Glass Mat) — Standard in modern vehicles and most current powersports batteries
• GEL — Specialty sealed batteries used in motorcycles and marine applications
• Sealed Maintenance-Free — Factory-sealed automotive batteries requiring no electrolyte service

Compatible battery size range: 14Ah to 80Ah at 12V.

Works With Every Vehicle in Your Garage

• Cars and sedans
• Pickup trucks and SUVs
• Motorcycles and touring bikes
• ATVs, UTVs, and side-by-sides
• Boats and marine vessels
• Personal watercraft
• Snowmobiles
• Lawnmowers and garden tractors
• Classic and collector vehicles
• RVs and campers
• Any 12V lead-acid, AGM, or GEL battery from 14Ah to 80Ah

Temperature-Compensated Charging — All Year, Any Climate

Lead-acid battery chemistry responds directly to temperature. Cold reduces electrolyte conductivity and requires higher charge voltage to reach full capacity; heat accelerates overcharge risk and electrolyte evaporation. The Battery Tender® Plus automatically adjusts charge voltage based on ambient temperature throughout the entire charging cycle — increasing voltage in cold storage conditions to ensure complete charging and reducing it in summer heat to prevent damage.

Safety Features

• Spark-proof connection technology — No current flows until polarity and connection integrity are confirmed, protecting vehicle electronics, ECUs, and alternators
• Reverse polarity protection — Automatic shutdown if clamps are reversed
• Short-circuit protection — Fault detection with automatic shutdown
• ETL and CETL certified — Independently tested and certified for safety in the United States and Canada

Stop Replacing Batteries. Start Maintaining Them.

The leading cause of premature battery failure is sulfation — the permanent, irreversible hardening of lead sulfate crystals on battery plates that occurs when a battery sits discharged. Unlike surface corrosion, sulfation is a physical structural change to the battery's lead plates. Once significant sulfation has formed, no charger can restore the lost capacity. The Battery Tender® Plus prevents sulfation from forming in the first place by keeping the battery at peak float voltage from the moment it is connected. Battery life consistently extends from 2–3 years to 5 years or more.

The 10-Year Warranty Difference

Battery Tender® backs the Plus with a 10-Year Limited Warranty — the longest warranty on any battery charger in the industry. Most competitors offer 1 to 5 years. A 10-year warranty is not a marketing claim; it reflects the component quality, manufacturing standards, and product confidence that Battery Tender® has maintained since its founding in DeLand, Florida in 1965.

10-Year Limited Warranty | Designed and Engineered by Deltran Corporation, DeLand, Florida Since 1965