Fogstar Drift Seat Base 12V 230Ah Lithium Leisure Battery — Gen 2 with Heater & Bluetooth

The Smartest Way to Add Serious Lithium Power to a Campervan

The Fogstar seat base battery solves the single biggest constraint in any modern campervan conversion: space. Most builds are crying out for usable amp-hours, but the upright lithium boxes that deliver 200Ah+ swallow a kitchen cabinet, half a wardrobe, or an entire garage bay.

The Gen 2 Fogstar Drift Seat Base tucks 230Ah of LiFePO4 capacity into a low, flat case that slides under most swivel seats and seat boxes, so you keep your storage and your power.

It’s built with Grade A EVE LiFePO4 cells, supported by a 10-year manufacturer warranty, and backed by Fogstar’s UK-based engineering team. So you get the chemistry and the build quality used by countless professional converters and DIY builders across the country.

Why a Fogstar Seat Base Battery Beats a Standard Upright LiFePO4

A typical “100Ah box” leisure battery measures roughly 330 × 175 × 220 mm. To match the energy of this Fogstar seat base battery, you would need two of them side by side, twice the bolts, twice the cables, twice the points of failure, and twice the floor area.

So if you’re converting a Ford Transit Custom, VW T6 or Mercedes Vito and you’ve already lost the spare wheel well to a diesel heater, this format is genuinely transformative.

Moreover, because the cells inside are Grade A EVE LiFePO4, the same chemistry trusted in marine and off-grid applications, voltage stays flat right down to roughly 10% state of charge. Therefore, your 12V compressor fridge, water pump and inverter all see consistent power instead of the steady sag you’d get from lead-acid or AGM.

Compact Footprint, Massive Capacity

At just 275 mm long × 315 mm wide × 187.5 mm tall, the Drift Seat Base is one of the slimmest 230Ah batteries on the UK market. It weighs 25 kg and ships with integrated carry handles, so a single installer can lift it into position without strain. Customers have successfully fitted it in:

• Volkswagen T6, T6.1 and Transporter conversions
• Ford Transit Custom and full-size Transit (with Sportscraft, Scopema or RIB seats)
• Mercedes-Benz Vito and Sprinter
• Fiat Ducato, Peugeot Boxer and Citroën Relay (X250 / X290)

Swivel-base heights vary between manufacturers, however, so always measure the under-seat aperture on your specific vehicle before ordering. We’re happy to advise — contact our team with your seat and base details, and we’ll confirm fitment.

Heated Cells for Real UK Winter Touring

Standard LiFePO4 cells cannot accept a charge below 0°C without sustaining damage. Consequently, plain lithium batteries are a poor choice for year-round UK touring or Scottish winter trips.

The Fogstar Drift Seat Base solves this with an automatic internal heater that warms the cells the moment charge is detected and temperature drops below threshold. So you can plug into a hookup, fire up the solar, or fold out the awning in a December lay-by without worrying about cold-charge damage.

Bluetooth Monitoring via the Fogstar Drift App

Every Gen 2 Seat Base ships with built-in Bluetooth and the free Fogstar Drift app for iOS and Android. The app pairs directly with the internal JBD BMS, so you see the live state of charge, individual cell voltages, current in and out, cell temperatures, MOSFET status, and remaining capacity in amp-hours.

As a result, troubleshooting is straightforward, and you’ll catch cell drift or weak charging long before it becomes a problem.

Technical Specifications

Recommended Add-Ons

To get the most out of your Fogstar seat base battery, pair it with:

• Drift PRO 2A Active Balancer — for occasional cell rebalancing every 3–6 months
• Fogstar Drift Battery Bracket — secure under-seat mounting
• A quality DC-DC charger to push fast charge from your alternator
• An MPPT solar charge controller for off-grid top-ups
• Properly sized battery cables and lugs — 35 mm² minimum for sustained 200A draw

Frequently Asked Questions

Will the Fogstar seat base battery fit under my swivel seat?

The case is 275 × 315 × 187.5 mm. Always measure the under-seat aperture on your specific vehicle and seat combination first, because swivel-base height varies between Scopema, Sportscraft, RIB and other manufacturers. Customers have successfully fitted it in VW T6 and T6.1, Ford Transit Custom, Mercedes Vito and Sprinter, Fiat Ducato, Peugeot Boxer and Citroën Relay.

Can I charge it from my vehicle’s alternator?

Yes. Pair it with a smart DC-DC charger sized for at least 30 A (a 50 A unit is ideal for fast charging). A standard split-charge relay is not recommended for modern Euro 6 vehicles with smart alternators.

What size inverter can I run from it?

The 200 A continuous discharge limit supports pure sine wave inverters up to roughly 2,500 W. For higher loads, run two Seat Base batteries in parallel for 460 Ah of capacity and 400 A continuous output.

Can I run two in parallel for 460Ah?

Yes, up to four can be connected in series or parallel. For parallel banks, balance the cable lengths and fuse each battery individually for safety.

Does the heater drain the battery overnight?

No. The heater only activates when an incoming charge is detected, and the cell temperature is below the threshold. Therefore, there’s no parasitic drain when the battery is sitting idle on a layby in January.

Buy Your Fogstar Seat Base Battery from Thermo Technica

We’ve been kitting out motorhomes, caravans and campervans for nearly thirty years. So when you order a lithium leisure battery from us, you get genuine UK stock, fast dispatch, and proper technical advice from people who understand the whole system, not just the battery.