EXIDE ER350 vs Exide ER550
We compare the EXIDE ER350 and the Exide ER550 across every dimension that matters - our scores, the key specs, and how each performs on the things you will actually notice day to day.
At a glance
| EXIDE ER350 | Exide ER550 | |
|---|---|---|
| Our score | 6.9/10 | 8.0/10 |
| Best for | Dependable, affordable off-grid power for caravans, motorhomes and boats | Dependable, affordable off-grid power for caravans, motorhomes and boats |
| Not ideal for | Heavy daily cycling where lithium's longer life would pay back | Heavy daily cycling where lithium's longer life would pay back |
| Brand | EXIDE | EXIDE |
Specifications compared
| EXIDE ER350 | Exide ER550 | |
|---|---|---|
| Voltage | 12V Verified | 12V Listed |
| Capacity | 80Ah Verified | 110Ah Shown in title |
Battery Type and Chemistry
EXIDE ER350
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.
Exide ER550
Battery type and chemistry matter because they determine how a leisure battery is charged and how it copes with repeated charging and discharging. The Exide ER550 is described as a deep-cycle, 12V, 115Ah (110Ah) HD deep cycle leisure battery, which indicates it is intended for sustained power use rather than quick engine-start bursts. Deep-cycle designs are built to tolerate deeper discharges better than starter batteries, but suitable charging routine is still important for long-term performance.
Capacity and Real Usable Power
EXIDE ER350
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.
Exide ER550
Capacity ratings indicate the energy storage of a leisure battery and can guide expectations for how long it can run common 12V loads before output becomes less steady under heavy discharge. The Exide ER550 is described as a 12V deep-cycle battery with 115Ah, and the title also notes 110Ah, so the practical usable capacity may align more closely with the lower figure. In a 12V leisure setup, higher capacity typically supports steadier voltage for lighting, electronics and small inverters, although how much power is available depends on the discharge depth and the specific device draw.
Cycle Life and Durability
EXIDE ER350
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.
Exide ER550
Cycle life and durability depend mainly on how a deep-cycle battery is used, as repeated charge and discharge cycles gradually wear out internal plates and connections. The Exide ER550 is a 12V, 115Ah (110Ah) HD deep-cycle leisure battery intended for regular cycling rather than quick bursts. Its lifespan typically lasts longer when discharge depth is kept moderate, and when the battery is not left at very low or very high states for long periods. Over time, internal resistance can rise, reducing usable performance.
Fitting and Charging
EXIDE ER350
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.
Exide ER550
When the Exide ER550 12V 115Ah (110Ah) HD deep-cycle leisure battery is fitted, the first priority is to place it securely and connect it correctly, because a loose terminal can cause poor charging or intermittent power. The installer should check polarity before tightening, then fit the red positive and black negative cables firmly. A correct connection helps the charging system work as intended, whereas an incorrect one can reduce performance or create safety risks. After wiring, the owner should test the voltage, confirm the charger type matches a 12V deep-cycle battery, and monitor charge behaviour during the first session, as charger settings are not provided.
Who Is This For?
EXIDE ER350
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.
Exide ER550
The Exide ER550 12V 115Ah (110Ah) HD deep-cycle leisure battery is designed for people who need a dependable 12V battery for leisure and deep-discharge use, rather than short bursts of power. It suits owners of leisure vehicles or portable power setups that involve regular, gradual energy draw. Rated for deep-cycle use, it fits applications where batteries are used and then recharged repeatedly. In comparison, a buyer looking for a battery for light, occasional use may not require a deep-discharge focused model. It is also a suitable option where a 12V system needs capacity around 115Ah (110Ah).
EXIDE ER350: 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
Exide ER550: pros
- Deep-cycle leisure battery
- 115Ah at 12V
- 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
Our verdict
Our pick is the Exide ER550 (our score 8.0/10) - A practical leisure battery (deep-cycle, 115Ah) for off-grid and leisure power. The EXIDE ER350 is still worth it if it is cheaper when you check, or if it better matches your specific needs.