Can I install a higher capacity battery in my Harmony Yachts Harmony 42?

Yes, you can install a higher capacity (Ah) battery as long as the physical dimensions fit your Harmony Yachts Harmony 42 battery compartment and the positive terminal position matches.

What battery does my boat or vessel need?

Boats need marine batteries that are resistant to moisture and salt corrosion. Deep-cycle AGM batteries are the most recommended because they can withstand repeated discharges and recharges without deteriorating.

What is a deep cycle battery?

A deep-cycle battery is designed to be discharged to 80% of its capacity and recharged repeatedly. It is ideal for boats where it is used as an extended power source. Do not confuse it with a standard starter battery.

How do I find the right battery for my vehicle?

Use the search tool by selecting your vehicle's make and model. Our system automatically filters compatible part numbers verified by our technicians. If you have any questions, contact us via WhatsApp.

What warranty do the batteries have?

All our batteries come with the legal guarantee provided by consumer law against manufacturing defects. If a battery has a manufacturing defect, it will be replaced at no cost to the user.

How long does it take for the battery to arrive?

Under normal circumstances, batteries usually arrive within 1 to 2 days of ordering. However, there are some cases where delivery may take a little longer: peak seasons (Black Friday, Christmas, etc.), palletized shipments, occasional stock shortages, etc.

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Harmony Yachts Harmony 42

Batteries for Harmony Yachts Harmony 42

Harmony Yachts · Harmony

Which battery does a Harmony Yachts Harmony 42 need?

Specifications and battery: 42

Harmony Yachts Harmony 42: depending on the equipment, it takes a 105 Ah, 950 A AGM battery (394 × 175 × 190 mm) or a 60 Ah, 760 A AGM battery (278 × 175 × 190 mm). Measure your current battery before choosing. In every case the positive terminal is on the right.

Recommended battery for this engine Start-Stop battery Varta A4 12V 105Ah 950A AGM €189.30 incl. VAT

View battery →

Battery for this engine

Version	Technology	Capacity	Cold cranking (EN)	Size (L×W×H)	Polarity
Depending on equipment 1	AGM	105 Ah	950 A	394 × 175 × 190 mm	+ on the right
Depending on equipment 2	AGM	60 Ah	760 A	278 × 175 × 190 mm	+ on the right

Data: vehicle specifications and the battery manufacturer's application catalogue.

EFB, AGM or conventional for this engine?

Rule of thumb for the Harmony Yachts Harmony 42: fit the same technology as the original or better (conventional → EFB → AGM), with equal or higher capacity and cold cranking amps, and respect the size and terminal position of around 105 Ah.

🔧 Battery Expert Advisor

Battery analysis for your Harmony Yachts Harmony 42

Quick answer Depending on the equipment, your vehicle uses one of these two main batteries: AGM 105 Ah (394×175×190 mm), for which we recommend VARTA A4, or AGM 60 Ah (278×175×190 mm): VARTA LA70. Before buying, check the Ah on your current battery's label or measure its length.

Batteries in your Harmony Yachts Harmony 42

MainDepends on equipmentSee all in the list →

Measure the length of yours: 394 or 278 mm

Our recommendation

VARTA A4

AGM105 Ah950 A

394 × 175 × 190 mm

€189.30Buy

Alternative

VARTA LA70

AGM60 Ah760 A

278 × 175 × 190 mm

€140.80Buy

Prices and availability updated on 28/10/2026

Based on the batteries we found for your vehicle, our experts help you pick the right one.

📋 What we found

For your Harmony Yachts Harmony 42 we found 6 compatible AGM or EFB batteries.

📏 Battery size

The list contains batteries in different sizes or capacities (Ah). In many cases both variants fit, but it's worth checking your compartment dimensions and the Ah of your original battery before buying. Choose the one with the same dimensions as your current battery: a bigger one may not fit the compartment or the hold-down. If several match your size, the higher capacity gives more headroom for cold starts.

📊 View AGM vs EFB vs Conventional — full comparison

⭐ Our recommendation

Our recommendation

For your Harmony Yachts Harmony 42 we recommend the VARTA A4 (AGM, 105 Ah). Varta is the world's leading manufacturer of starter batteries and supplies first-equipment (OEM) batteries to the major European car makers.

Rated 4.9/5 by 8 verified customers.
Get it on Friday before 5 PM — your product ships tomorrow.
22% cheaper than the most expensive option in the list.

See this battery →

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Verified selection

Class: Boat Batteries
Brand: Harmony Yachts
Model: Harmony
Engine: 42

Order now with express shipping: your product ships tomorrow and arrives on Friday before 5 PM (Spain mainland and Portugal only).

Before you buy: check 3 key points

Although the batteries shown are sourced from information provided by manufacturers, we recommend checking on your current battery:

Dimensions (length × width × height, including terminals and protrusions)
The dimensions shown are the maximum of the battery and include the height of the terminals, small ridges at the base and any lateral protrusions. Measure your current battery completely, from edge to edge. The new one must be the same size or slightly smaller — never larger, it would not fit in the housing.
Positive terminal (left or right viewed from the front — check the battery photo carefully)
Stand facing the battery, with the manufacturer's label facing you and the terminals on top. Locate the terminal marked with +: if it is on your right, it is "positive right"; if it is on your left, it is "positive left". Do not rely on how the battery is mounted in the car — the position is always measured looking only at the battery itself.
Technology (AGM, EFB or conventional — the same as your current battery or higher)
Depending on the manufacturer, the same technology may be labelled differently: AGM may also appear as VRLA, AGM Start-Stop or AGM Deep Cycle. EFB may appear as EF, EFB+ or Enhanced Flooded Battery. Conventional may appear as SLI, Lead-Acid, Wet or Standard. If your vehicle has Start-Stop, the battery must be AGM or EFB — never conventional.

If you have any questions, just ask us and we'll be glad to advise you with no obligation.

AGM / EFB batteries

AGM or EFB technology batteries: more charge cycles, faster recovery and a longer life than a conventional battery.

6 products

Comparison table of available products
Category	Make	Reference	Capacity	Cold cranking	Dimensions	Technology	Price
AGM / EFB batteries	VARTA	A4	105 Ah	950 A	394×175×190 mm	AGM	€189.30	More info
AGM / EFB batteries	EXIDE	EP600	70 Ah	760 A	278×175×190 mm	AGM	€140.10	More info
AGM / EFB batteries	VARTA	LA105	105 Ah	950 A	394×175×190 mm	AGM	€243.90	More info
AGM / EFB batteries	VARTA	LA70	70 Ah	760 A	278×175×190 mm	AGM	€140.80	More info
AGM / EFB batteries	KRONOBAT	DP-105-AGM	105 Ah	950 A	394×175×190 mm	AGM	€190.30	More info
AGM / EFB batteries	KRONOBAT	EV-105-AGM	105 Ah	950 A	393×175×190 mm	AGM	€195.20	More info

Frequently asked questions

: Harmony Yachts Harmony 42: depending on the equipment, it takes a 105 Ah, 950 A AGM battery (394 × 175 × 190 mm) or a 60 Ah, 760 A AGM battery (278 × 175 × 190 mm). Measure your current battery before choosing. In every case the positive terminal is on the right. We found 6 compatible batteries priced between 140,10€ — 243,90€. Check dimensions and positive terminal position before purchasing.
: Yes, you can install a higher capacity (Ah) battery as long as the physical dimensions fit your Harmony Yachts Harmony 42 battery compartment and the positive terminal position matches.
: Boats need marine batteries that are resistant to moisture and salt corrosion. Deep-cycle AGM batteries are the most recommended because they can withstand repeated discharges and recharges without deteriorating.
: A deep-cycle battery is designed to be discharged to 80% of its capacity and recharged repeatedly. It is ideal for boats where it is used as an extended power source. Do not confuse it with a standard starter battery.
: Use the search tool by selecting your vehicle's make and model. Our system automatically filters compatible part numbers verified by our technicians. If you have any questions, contact us via WhatsApp.
: All our batteries come with the legal guarantee provided by consumer law against manufacturing defects. If a battery has a manufacturing defect, it will be replaced at no cost to the user.
: Under normal circumstances, batteries usually arrive within 1 to 2 days of ordering. However, there are some cases where delivery may take a little longer: peak seasons (Black Friday, Christmas, etc.), palletized shipments, occasional stock shortages, etc.

Guides

Batteries for Harmony Yachts Harmony 42

Which battery does a Harmony Yachts Harmony 42 need?