Battery Tender 5 AMP Selectable 12V / 24V Battery Charger and Maintainer - Switchable 5 AMP / 2.5 AMP Onboard Marine for Boat Watercraft - Screw Mountable Heavy Duty Weather Resistant - 022-0258-DL-WH

What makes this a marine onboard charger versus a regular battery charger?

Marine onboard chargers are permanently installed inside the boat and maintain batteries automatically when connected to shore power. This model features ignition protection. 12V/24V support. waterproof construction. and compact onboard installation.

Does this work on both 12V and 24V boat electrical systems?

Yes. the Battery Tender 5A Marine Onboard charger supports both 12V and 24V systems. It delivers 5A in either mode with a voltage-specific 4-stage charging algorithm. Always set the correct voltage before installation to ensure proper charging.

How much current does 5 AMPs provide for a large trolling motor battery?

At 5A. a 100Ah trolling battery at 50% discharge recharges in ~11–12 hrs; a 120Ah Group 31 takes ~13–14 hrs. Ideal for overnight dock charging. balancing recovery speed. charger size. and cost better than maintenance-only models.

Will this damage my boat's electronics when connected?

No. the Battery Tender 5A Marine Onboard uses regulated smart charging that won't harm boat electronics or create interference. Its ignition-protected design is safe around fuel vapors. and float mode delivers only minimal maintenance current.

Can this maintain my boat at the marina dock all summer?

Yes. this is exactly what an onboard marine charger is designed for. Connect to shore power and the Battery Tender 5A automatically recharges after use. then maintains the battery in float mode so it stays fully charged and ready between trips.