SB S100 vs SuperBatt DT120
We compare the SB S100 and the SuperBatt DT120 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
| SB S100 | SuperBatt DT120 | |
|---|---|---|
| Our score | 9.4/10 | 8.6/10 |
| 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 | SB | SuperBatt |
Battery Type and Chemistry
SB S100
Although the leisure battery is described as a "deep-cycle" battery, the product title does not specify the exact battery chemistry (for example lithium, AGM, or gel), so the chemistry type must be treated as unknown based on the available information. The title states it is a 12V, 100Ah deep-cycle leisure battery intended for caravan, motorhome, and marine boat use. This matters because charge behaviour, maintenance needs, and lifespan can vary by chemistry even when voltage and capacity match. Buyers should confirm the chemistry type with the seller or the accompanying documentation, then match the charger profile and wiring to the confirmed chemistry for safer operation and fewer charging surprises.
SuperBatt DT120
This leisure battery is a 12V deep-cycle leisure and marine battery. Deep-cycle batteries are designed for repeated discharging and recharging over longer periods, making this type suitable for running accessories for extended sessions, such as on boats or caravans, rather than for short bursts of high starting power. The product is also described as intended to replace other deep-cycle models such as 12V 110Ah or 12V 105Ah units, but any chemistry-specific compatibility should be verified first.
Capacity and Real Usable Power
SB S100
Capacity indicates the total energy the SB can store and therefore how long it can run a connected load before the battery requires recharging. The leisure battery is rated at 12V and 100Ah, so its storage is measured in amp-hours, which influences run time for a given device load. Usable power can be lower than headline capacity because some energy is held back as reserve and because real-world loads draw current at different rates. Buyers should assess expected current draw, then compare it against the 100Ah rating, keeping margins for real-world losses and wiring.
SuperBatt DT120
Despite it being marketed as a 12V 120Ah deep-cycle leisure and marine battery, the 120Ah figure is a stated capacity, not a guarantee of how much power will be usable in every situation. Usable energy depends on how deeply the battery is discharged, because drawing beyond the intended portion reduces available energy and increases stress on the battery. The DT120's rated capacity indicates it is intended to support steady loads for longer than smaller units, but results vary with wiring losses, operating temperature, and the size of the current draw. Consumers should confirm the intended discharge level and match the battery to the requirements of their device.
Cycle Life and Durability
SB S100
Cycle life and durability matter because they indicate how many charge-and-discharge cycles this leisure battery can complete before its usable performance drops, which affects how often it needs replacing. As a deep-cycle 12V, 100Ah leisure battery, it is designed for repeated use in caravan, motorhome and marine settings. The product title does not specify cycle counts, recharge limits or lifespan indicators, so those expectations are not confirmed. Cycle life depends on depth of discharge, charge completion and temperature exposure. Without published figures, the approach should be conservative, particularly where use involves frequent deep discharges or heat exposure.
SuperBatt DT120
Cycle life and durability matter because deep-cycle leisure and marine batteries are designed for repeated charge and discharge cycles. The SuperBatt (79GY) is a 12V 120Ah deep cycle leisure and marine battery intended for that kind of ongoing use. Durability is influenced by discharge depth, charging consistency and operating conditions, as capacity losses can develop gradually over time. Heat also reduces lifespan, so storage and use temperature are relevant considerations for long-term performance.
Fitting and Charging
SB S100
For a deep-cycle 12V, 100Ah leisure battery such as the SB S100, fitting and charging planning starts with safe installation and correct charge handling, because faults at the installation stage can reduce service life even when the battery is made for caravan, motorhome, and marine use. The battery is mounted securely in the available space, with terminals kept dry and protected. Cable connections are made with correct polarity, and fittings are tightened properly to help minimise heat build-up. During charging, a compatible charger for leisure batteries is used, and overcharging is avoided by monitoring charge behaviour. When the battery is left unused, periodic top-ups are scheduled, because long gaps can lead to loss of capacity.
SuperBatt DT120
When fitting and charging a deep-cycle leisure or marine battery such as the leisure battery (12V 120Ah), the priority is to connect it safely and match the charger to the battery correctly. Buyers should confirm the battery area is vented and that the terminals are dry, then secure the battery to prevent movement. Next, he connects the positive lead first, then the negative, keeping cables clear of sharp edges and metal. For charging, he uses a charger intended for 12V batteries and follows the charger's settings rather than guessing. If the battery becomes warm or shows faults, he stops charging and rechecks the wiring before continuing.
Who Is This For?
SB S100
This deep-cycle 12V 100Ah SB S100 leisure battery is suited to caravan, motorhome, and marine setups where steady power draw is expected over longer periods. It is aimed at replacing an existing 12V battery or building a new leisure power system, with 100Ah capacity listed as the key figure. The deep-cycle description aligns with repeated discharge and recharge use patterns, rather than the short, high-burst performance expected from a starter battery. Buyers who need to confirm compatibility with existing wiring should verify the required fitment, since no installation details are provided in the product information shown. It is not positioned as a starter-style battery, because the emphasis is on leisure use rather than cranking output.
SuperBatt DT120
This battery suits people who need a 12V deep-cycle leisure or marine option, including replacement use when moving from a 12V 110Ah or 12V 105Ah battery to the SuperBatt rated at 120Ah. It is aimed at buyers looking for a like-for-like capacity level within a 12V system, rather than switching voltage. Because it is described for leisure and marine deep-cycle use, it can be relevant for caravan use, boat use, and other applications with steady loads over time.
SB S100: pros
- Deep-cycle leisure battery
- 100Ah at 12V
- Suits caravan, motorhome, marine
- 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
SuperBatt DT120: pros
- Deep-cycle leisure battery
- 120Ah at 12V
- Suits marine
- 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 SB S100 (our score 9.4/10) - A practical leisure battery (deep-cycle, 100Ah) for off-grid and leisure power. The SuperBatt DT120 is still worth it if it is cheaper when you check, or if it better matches your specific needs.