DayBox | Spare Lithium Battery

Never cut a trip short again.

NEWDesigned in Australia · First batch is limited

$199.99AUD

Back order: sold out for now. Order today, estimated to ship by 10 August.

4 interest-free payments of $49.99 with afterpay Zip Klarna

Complete your kit:

No DayBox yet?Add the battery-powered fridge this battery runs

Add the Premium CoverIts pocket is shaped to carry this spare battery· Back order, ships by 31 July

Back order · estimated to ship by 10 August · free shipping Australia-wide

or express checkout

Shop with confidence30-day money-back returns · 12-month warranty · Secure checkout

Australian Designed, Owned & OperatedBacked by a local team, here before, during & after your trip

168Wh
Capacity

USB-C
60W In/Out

Fast
Hot-Swap

Power Bank
For Devices

Built For
Off-Grid

Fits 12L
& 18L

Runtime calculator

How long will it stay cold?

Set your day. See your hours.

Mode

Day temperature

Lid opens

Add-ons

Insulated cover Spare battery

24hrs

Estimated cooling on battery power

Based on real-world testing. Conditions vary.

DayBox spare battery packed for the trip

More runtime. More adventure.

Take a spare. Stay out longer.

Power running low is the one thing that ends a good trip early. Carry a charged spare, swap it in, and stay off-grid for the long weekend instead of the long drive home.

Add a Spare Battery

The simplest upgrade you can make

2×

the runtime, in seconds

Your DayBox runs on a removable 168Wh lithium battery. Carry a second one and you've doubled your off-grid cooling time. When the first runs flat, swap in the spare and keep going. No cords, no car idling, no warm beers.

Swap in seconds Charge your devices too Off-grid for longer

Runtime depends on ambient temperature, set point, lid use and mode. A spare battery provides additional stored energy equal to the one in your DayBox.

More Than a Fridge Battery

Built-in charging outputs turn it into a portable power source wherever you need one.

USB-C Fast Charge

60W in and 60W out. Fast-charges the battery itself, and powers up laptops, tablets, phones, rechargeable lighting and portable camping gear.

60W In / Out

USB-A Output

A 10W USB-A port for the everyday stuff: phones, speakers, GPS units and accessories. Top up while the fridge keeps running.

10W Output

Runs Your DayBox

Drops straight into the 12L or 18L DayBox as a fresh power source. The same genuine battery your fridge already uses. Fully compatible, every time.

12L & 18L

Fast-swap design

Dead battery? Fresh one in seconds.

No setup, no downtime, no interruption. Lift the flat battery out, drop the charged spare straight into the bay, and the DayBox keeps cooling. Simple plug-and-play performance built for life outdoors, exactly when you need it most.

Get a Spare Ready

Built for Off-Grid Reliability

168.48Wh of lithium energy storage, engineered to perform in demanding outdoor conditions.

168.48Wh Lithium

15.6Ah at 10.8V of dependable lithium-ion energy, ready to keep your fridge cold.

60W USB-C Fast Charge

Recharge the pack quickly over USB-C, or push 60W back out to charge laptops and devices on the go.

True Hot-Swap

Swap a flat battery for a charged one in seconds. No tools, no wiring, no waiting.

Lightweight & Portable

Compact enough to pack, with fold-out end handles for an easy one-handed carry.

Doubles as a Power Bank

USB-C and USB-A outputs mean one battery powers your DayBox and tops up your everyday gear.

Genuine & Compatible

The exact battery the DayBox 12L and 18L are built around. Guaranteed fit, 12-month warranty.

Power Wherever the Day Goes

Camping, beach, fishing, 4WD touring, worksites and emergency backup. Keep the cold (and the charge) coming.

Camp

A second night off-grid, no car recharge

Beach

Cold drinks from sunrise to sundown

On the Water

Backup power for a day on the boat

4WD Touring

Backup power for the long way round

Battery Specifications

Genuine DayBox spare lithium battery, the same pack that powers the 12L and 18L.

DayBox spare battery ports: USB-C and USB-A

Spare Battery168.48Wh

Battery chemistryLithium-Ion

Voltage10.8V

Capacity15.6Ah

Stored energy168.48Wh

Charging voltage12.6V

USB-C input60W

USB-C output60W

USB-A output10W

CompatibilityDayBox 12L & 18L

Why Add a Spare Battery?

Because nobody packs the car, drives for hours, and hopes the power lasts. A spare means you never have to think about it.

No warm food

Keep the fridge cold right through the trip. No soggy sandwiches, no spoiled meat, no tipping out the esky.

No flat batteries

A charged spare in the bag means dead phones and flat camp lights are never the reason you head home.

No idling the car

Stop running the engine just to recharge. Swap in the spare and leave the car (and the noise) alone.

A spare battery means confidence.

Freedom without compromise.

Goes Great With

Round out your kit: the fridge this battery powers, and a cover tailored to carry it.

The main event

DayBox

The battery-powered portable fridge this spare runs. Cold drinks anywhere. No ice, no power point.

See price

Choose your size

Carry it covered

Premium Cover

Double-wall insulation for up to 50% longer runtime, with a side pocket shaped to carry this exact spare battery.

See price

Choose your size

DayBox + spare battery is the combo most customers go for: a full day of cold, then some.

Spare Battery Questions, Answered

Will this battery fit my DayBox?+

Yes. It's the genuine spare battery for the DayBox range and fits both the 12L and 18L fridges.

How much extra runtime do I get?+

A spare adds a second full 168.48Wh charge, effectively doubling your off-grid cooling time. Actual hours depend on temperature, set point, lid use and mode.

How do I swap the battery?+

Lift out the flat battery and drop the charged spare into the bay. No tools, no wiring, and the fridge keeps cooling in seconds.

Can I charge my phone or laptop from it?+

Yes. USB-C (60W in and out) charges laptops, tablets and phones, and a 10W USB-A port covers smaller gear. It doubles as a portable power bank.

How do I charge the battery itself?+

Over USB-C at up to 60W, at home before a trip or on the road from any compatible USB-C source.

What's in the box?+

One genuine DayBox spare lithium battery (168.48Wh). Charging cables and the DayBox fridge are sold separately.

Is there a warranty?+

Yes. 12 months from purchase, with free shipping on warranty claims within Australia.

Never cut a trip short.

Pack a Spare.
Stay Out Longer.

168Wh of genuine DayBox power. Double your runtime and keep your devices charged, wherever the day goes.

✓ Fits 12L & 18L · ✓ Free shipping · ✓ 30-day returns

DayBox | Spare Lithium Battery

How long will it stay cold?

Take a spare. Stay out longer.