EXIDE ER350 Review UK 2026
Quick verdict
Score: 6.9/10
Best for: Dependable, affordable off-grid power for caravans, motorhomes and boats
Not for: Heavy daily cycling where lithium's longer life would pay back
Bottom line: A practical leisure battery (deep-cycle, 80Ah) for off-grid and leisure power.
Overall, the EXIDE ER350 is a 12V 80Ah deep-cycle leisure marine battery that can also be used for dual-purpose applications (starting and auxiliary). This exide er350 review uk summary positions it for boats, caravans, and leisure setups where regular auxiliary use and starting support both matter. As an exide leisure battery, it is a straightforward 12V 80Ah option with a three-year warranty.
Key specifications
| Spec | Value Notes |
|---|---|
| Voltage | 12V Verified |
| Capacity | 80Ah Verified |
| Use | Marine Verified |
| Purpose | Dual (starting/aux) Verified |
Pros
- Deep-cycle leisure battery
- 80Ah at 12V
- Suits marine
- Dual purpose (start + leisure), NCC verified
- Proven, affordable off-grid power
Cons
- Only around half the rated capacity is safely usable
- Heavier and shorter cycle life than lithium
- Match the capacity to your real daily power draw
Battery Type and Chemistry
Battery type and chemistry matter here because this leisure battery is described as a deep-cycle 12V 80Ah leisure marine battery built for dual purpose (starting and auxiliary). A deep-cycle design is intended to handle repeated discharge and recharge more effectively than a starter-only battery, which suits leisure boating where loads can vary. The dual-purpose claim indicates it can be used for both engine starting and powering accessories, though the exact suitability depends on the boat's electrical setup and how it is used.
Capacity and Real Usable Power
Capacity matters because the EXIDE is listed as a 12V 80Ah deep-cycle leisure marine battery, and the "80Ah" figure describes its stored charge capacity. In practical terms, a higher amp-hour rating generally indicates more runtime under the same load and conditions.
Cycle Life and Durability
Cycle life and durability matter because the leisure battery is described as a 12V 80Ah deep-cycle leisure marine battery. Deep-cycle batteries are designed to handle repeated charge and discharge cycles more often than standard starter batteries, so long-term performance depends on the depth of discharge, how regularly it is recharged, and whether it is kept within safe operating ranges. With repeated cycling, capacity can slowly fade, and owners should monitor any gradual change in performance.
Fitting and Charging
When the EXIDE is fitted, correct placement and connection matter as much as the battery itself, because deep-cycle leisure marine units work only if they are secured and wired properly. The installer should place it in a ventilated, stable location, then tighten terminals firmly, and check polarity before switching on any loads. For dual purpose use, starting and auxiliary wiring should match the vehicle's original layout, and fusing should be confirmed, so shorts cannot damage circuits. Charging should follow the charger manual. If unsure, a qualified marine electrician should verify the setup.
Who Is This For?
Who is the leisure battery most suitable for? This 12V 80Ah EXIDE ER350 deep-cycle leisure marine battery is designed for dual purpose use, combining starting and auxiliary power. It suits owners of boats or marine setups who want an 80Ah capacity for day-to-day loads while also covering engine starting needs. It is also a fit for vehicles or leisure systems that specifically prefer a dual purpose battery. It is less suitable if you only need a dedicated auxiliary unit.
Where to Buy in the UK
In the UK, the EXIDE ER350 is typically bought from retailers that stock leisure and deep-cycle batteries. Many listings confirm key fit details such as 12V and 80Ah and describe it as a deep-cycle dual-purpose type, but the exact terminal type and casing dimensions are not stated in every advert. Buyers should confirm the battery title details, check the delivery range and verify the stated guarantee period before ordering. For faster collection when replacing an existing leisure or marine battery, in-store purchase can be an option where the product is stocked.
Frequently Asked Questions
Is the EXIDE worth it?
For powering marine, the leisure battery (a deep-cycle battery) rated at 80Ah does the job. The right choice depends on how much power you draw, how you charge, and your budget - traditional and AGM batteries cost less upfront but give less usable capacity and a shorter life. Check the current Amazon UK price against the cost-per-cycle, not just the sticker.
What type of battery is the EXIDE?
The leisure battery is a deep-cycle leisure battery. Traditional flooded and sealed lead-acid deep-cycle batteries are the most affordable option and are well proven for caravans and motorhomes. The trade-off versus lithium or AGM is more weight, a shorter cycle life, and that you should only use around half the rated capacity to avoid shortening its life.
How much power does this leisure battery give?
The EXIDE is rated at 80Ah at 12V. Crucially, USABLE capacity is not the same as rated capacity: with lithium you can safely use most of it, but with lead-acid, AGM and gel you should only draw around half before recharging, or you'll shorten its life. So a 80Ah lead-acid battery gives roughly half that in day-to-day usable power. Size your battery to your actual daily draw with that in mind.
What is the EXIDE ER350 suitable for?
The leisure battery is suited to marine. Deep-cycle leisure batteries are built to be discharged steadily over hours - running lights, a fridge, a water pump or electronics - and then recharged, which is different from a starter battery that gives a short, huge burst to crank an engine. Match the capacity to your typical daily power use and how long you go between charges.
What features does this leisure battery have?
The EXIDE offers dual purpose (start + leisure), NCC verified. Dual-purpose means it can both start an engine and run leisure loads, useful in a campervan with a single battery. NCC verification is an independent UK classification of leisure batteries, so you know what you're getting. Match the features to how you'll use it.
How do you charge the leisure battery?
The EXIDE charges from a mains smart charger, the vehicle alternator (ideally via a suitable split-charge or DC-to-DC system), or solar through an MPPT controller. For lead-acid, AGM and gel, recharging promptly and fully after use, rather than leaving it part-discharged, is the single biggest thing you can do to extend its life. Avoid repeatedly draining it flat.