Battery Tender 5A Selectable 12V/24V Charger — Screw-Mount Onboard Weather-Resistant with Auto Float

The Battery Tender 5 AMP Selectable charger is a compact, screw-mountable 12V/24V battery charger and maintainer that delivers selectable 5A or 2.5A charging and automatic float maintenance for cars, boats, and industrial equipment.

This weather-resistant unit from Battery Tender is built for on-board installation and prolonged exposure in marine and outdoor environments. It accepts both 12V and 24V batteries and lets you choose a 5 amp or 2.5 amp charge rate depending on battery size and application. The charger finishes with an automatic float stage to preserve battery life without overcharging, while built-in protections help ensure safe connections and reliable operation on boats, ATVs, industrial vehicles, and other equipment.

How does this charger fit on a boat or vehicle?

The case is screw-mountable so you can attach it to a bulkhead, under a dash, or inside an equipment bay. Its compact footprint and integrated mounting pattern minimize installation time and help keep wiring tidy and protected.

• Pre-drilled mounting holes for secure screw attachment.
• Compact housing designed for tight spaces.
• Weather-resistant enclosure suited to marine and outdoor use.
• Works with standard battery cables and ring terminals for permanent installs.

What safety features protect my battery and electrical system?

Safety-focused design reduces installation risk and prevents common charging mistakes. The charger is spark-proof on lead connection and detects reverse polarity so power is only delivered when connections are correct. It switches to float mode automatically when a full charge is reached.

• Spark-proof lead connection to avoid ignition risks during hook-up.
• Reverse polarity detection prevents delivering charge with incorrect wiring.
• Automatic float maintenance to maintain voltage without overcharging.
• Multi-stage charging logic tailored to standard lead-acid battery chemistry.

Which batteries and situations is the 5A selectable charger best for?

This model suits a wide range of lead-acid battery types used in automotive, marine and industrial contexts. Use the 5A setting for larger batteries and the 2.5A setting for smaller batteries or slow-maintenance scenarios. It’s intended for routine charging, onboard maintenance, and seasonal storage support rather than rapid emergency jump-starting.

• 12V and 24V lead-acid batteries (including flooded, AGM, and gel variants).
• On-board installations on boats, trailers, industrial machines, and off-road vehicles.
• Seasonal battery maintenance during long storage periods.
• Devices needing reliable float maintenance after a full charge.

Who is this for: The Battery Tender 5 AMP Selectable charger is aimed at boat owners, fleet managers, and equipment operators who want a durable, permanently mounted charging solution. It’s a fit for anyone who needs an installer-friendly, weather-resistant unit that provides selectable current, automatic float maintenance, and basic electrical protections for everyday charging and long-term battery care.