Battery Tender 4 Bank 12A On-Board Marine Battery Charger is a purpose-built battery charger/maintainer designed to safely charge and maintain automotive and powersports batteries. It uses an automatic charging profile and transitions to maintenance/float once the battery is full.

Best for

• Best when you want a 10A per bank (40A total) maintainer: small to midsize starting batteries, seasonal storage
• Best for 4-battery setups: multiple vehicles, fleets, or shop benches

Key technical details

• SKU: 022-1004-DL-WH
• UPC: 734357221046
• System voltage: 12V
• Output: 10A per bank (40A total)
• Banks: 4
• Notable features: auto float/maintenance
• Typical use: marine/RV onboard multi-battery charging

Quick technical Q&A

Will it overcharge my battery if I leave it connected?

No—once the battery reaches full charge, it switches to a maintenance/float stage to hold storage voltage instead of continuously charging.

What battery chemistry is it meant for?

This unit is intended for common lead-acid batteries. Always confirm your battery type and voltage before connecting.

How do I choose the right amperage?

Lower amps are ideal for maintenance and small batteries; higher amps are better for faster recovery on larger batteries. If unsure, pick the lowest output that comfortably meets your use case.