5 picks with specs, filters and a calculator to find the right size.
Match the charger to your battery type, and give each battery its own bank in a 24 V or 36 V trolling setup.
A portable charger and maintainer that handles flooded, AGM and 12 V lithium batteries, with temperature compensation and a force mode for dead batteries.
Best for: Charging one battery at home and keeping it topped up in storage.
Check price on Amazon (paid link) Specs from batterymart.comA waterproof, sealed charger you can set up and watch from the VictronConnect app, with a 7-step charge profile.
Best for: Lithium owners who want app control.
Check price on Amazon (paid link) Specs from solar-electric.comAn onboard charger for 24 V trolling setups. Each bank is set to its own battery type, and the lithium profile can wake a sleeping lithium battery.
Best for: 24 V trolling motors with two 12 V batteries.
Check price on Amazon (paid link) Specs from ezokofishing.comA sealed 3-bank onboard charger that charges and maintains each battery on its own.
Best for: 36 V trolling banks, or a 24 V bank plus a starting battery.
Check price on Amazon (paid link) Specs from continentalbattery.comA premium onboard charger with 12 charge profiles including lithium, digital displays and a UL listing.
Best for: Bigger boats that want fast charging and fine control.
Check price on Amazon (paid link) Specs from westmarine.comNo products match those filters. Try clearing one.
Pictures are our own illustrations, not photos of the actual products. Specs come from the manufacturer or retailer listing linked on each card and were checked in October 2026. Models and prices change, so confirm details on the listing before you buy. As an Amazon Associate I earn from qualifying purchases.