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Someone whose house bank or trolling-motor battery has died is trying to answer one question: what replaces this, and will it actually fit? Today that takes a manufacturer page that lists no part number, a retailer listing that says “compatible” without saying on what basis, a forum thread from 2021, and a recall database that is hard to search by model.

This site puts those in one place, per model, with the source for every figure. Not a review site and not a shop — a reference you can check.

We do not manufacture, sell, distribute, install, repair, test or certify anything. We are not a laboratory, a certification body, an insurer or a safety authority, and we are not affiliated with or authorised by any manufacturer, brand or regulator named here.

We never say a battery is safe, and we never say a battery is guaranteed to fit. What we publish is what a named source says, with the source attached, so you can judge it yourself. Where the evidence is weak we say so rather than rounding it up — see Methodology.

If a figure here is wrong, tell us and we will check it against the source and fix it. Manufacturers, retailers and owners are all welcome to write; an official document attached to an email is the most useful thing you can send, and it is why corrections arrive by email rather than through a form.

If something here is dangerous — a specification that could lead someone to fit the wrong battery — say so and it will be treated ahead of everything else. See Contact.

The catalogue covers deep-cycle batteries and the two things that relate to them: what houses them — boats, motorhomes, trailers, camper vans, overland vehicles, cabins — and what draws from them, such as trolling motors, outboards, inverters, refrigeration and winches. Along with the chargers and solar controllers that go with them, and safety records from the regulators of the United States, United Kingdom, European Union, Australia, Canada and France.

It is not complete and does not claim to be. Where a model is absent, that means we have not read it yet, not that it does not exist.

Two axes, and every model in the catalogue sits on one of them. The first is what houses a battery bank:

• motorhomes — a self-propelled RV with its own house battery bank, Class A, B or C
• travel trailers — a towable RV with no engine of its own
• fifth-wheel trailers — a towable RV that hitches over the tow vehicle's bed
• camper vans — a van built out with a living space and its own house power system
• truck campers — a cabin that sits in or over a pickup bed
• skoolies — a bus converted into a home, running its own house bank
• powerboats — a motorised boat with a house or start battery system
• sailboats — a boat under sail carrying its own house battery bank
• kayaks and other small paddle craft carrying a trolling motor and its own battery
• overland vehicles — a built-out 4x4 or expedition truck with an auxiliary power system
• cabins and outbuildings — an off-grid structure running on a battery bank rather than a grid connection
• other platforms — something that houses a house battery bank but does not fit one of the kinds above

The second is what draws from one:

• trolling motors — the electric motor mounted on a boat that draws directly from its battery bank
• electric outboards — a full electric propulsion outboard, as distinct from a trolling motor
• electric inboard motors — electric propulsion mounted inside the hull, including thrusters, drawing from the battery bank
• inverters — the device that turns a battery bank's DC into the AC household appliances need
• marine electronics — chartplotters, fishfinders and other onboard electronics drawing from the bank
• battery monitors — the device that reports a bank's state of charge, voltage and current draw
• refrigeration — a 12V fridge or freezer running off the house bank
• winches — an electric winch drawing a heavy load current from the bank

Along with the batteries and chargers that connect the two, and the solar controllers that charge them.

• motorhomes
• travel trailers
• fifth-wheel trailers
• camper vans
• truck campers
• powerboats
• other platforms
• trolling motors
• electric outboards
• inverters
• battery monitors
• refrigeration units

In scope but not yet researched to a publishable page: skoolies, sailboats, kayaks, overland vehicles, cabins and outbuildings, electric inboard motors, marine electronics, winches. Absent here means our research has not reached that kind yet, not that no such product exists.