Protect your investment with Battery Tender classic car battery maintainers designed for vintage vehicles. Our low-amp, smart-charging technology prevents sulfation and overcharging while keeping your collector car ready to start at any time. Preserve performance and authenticity with the charger trusted by classic car enthusiasts.
Maintain your classic car’s battery with our 4-Bank 12V Battery Charger, designed to charge and maintain at proper storage voltage without the damaging effects caused by trickle chargers.
Maintain your classic car’s battery with our 4-Bank 12V Battery Charger, designed to charge and maintain at proper storage voltage without the damaging effects caused by trickle chargers.
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Reviving Classic Cars with Battery Tender: As Seen on Hagerty’s 'Barn Find Hunter'
Battery Tender sponsors this episode of Barn Find Hunter hosted by Tom Cotter, featuring Paul Gentilozzi and his collection of cars in a former supermarket.
Getting stranded with a dead car battery is an inconvenience we all hope to avoid. Having a reliable jump starter handy can save the day and get you back on the road quickly. But how many amps do you really need to jump your car?
Classic and vintage vehicles are typically stored for months or years between uses. During that time, the battery loses voltage through natural self-discharge — and without a charger and maintainer connected, it eventually drops below the threshold where sulfation begins. Sulfation is the permanent hardening of lead sulfate crystals on the battery plates; once significant sulfation has formed, no charger can restore the lost capacity. A Battery Tender® charger and maintainer connected during storage prevents sulfation from forming, consistently extending battery life from 2 to 3 years to 5 years or more and ensuring the car starts reliably every season.
Most post-1955 vehicles use a standard 12V electrical system compatible with the Battery Tender® Plus 12V 1.25 Amp — the most trusted charger and maintainer for classic and collector vehicles. Pre-1956 vehicles and many through the early 1960s use 6V electrical systems, requiring the Battery Tender® Plus 6V 1.25 Amp. For garages maintaining both 6V and 12V classics, the Battery Tender® Plus 6V/12V 1.25 Amp handles both with a manual voltage selector.
Yes — Battery Tender® Plus chargers and maintainers are fully compatible with all standard lead-acid battery chemistries including flooded wet-cell, AGM, gel cell, and sealed maintenance-free batteries used in classic vehicles. The ISM 4-stage algorithm adjusts automatically to the battery's state and chemistry, preventing the overcharging and gassing that damaged vintage batteries with old constant-current chargers. The Battery Tender® Plus is used by concours restoration shops, museum collections, and private collectors worldwide specifically because it is safe for unattended long-term connection to valuable vehicles.
Most lead-acid batteries begin losing capacity from sulfation within 4 to 8 weeks of sitting without a charger and maintainer connected, depending on temperature and parasitic drain. In unheated storage below freezing, a discharged battery can freeze and crack — physically destroying it. A Battery Tender® charger and maintainer eliminates both risks: continuous float charging keeps the battery fully charged regardless of storage duration or temperature, and automatic temperature compensation adjusts the charge voltage for cold conditions.
Install a Battery Tender® ring terminal harness permanently on the battery — it takes minutes and stays connected indefinitely without corrosion. Route the SAE quick-disconnect end to an accessible location outside the engine bay. Each time the vehicle enters storage, plug in the Battery Tender® Plus charger and maintainer and leave it connected. No timed sessions, no checking, no manual disconnection. ISM handles the entire charge cycle and maintains float voltage for as long as the car is parked — weeks, months, or years. The battery emerges from every storage period at 100% capacity, ready to start on the first turn.
